9-7X L6-4.2L (2008)
Component Connector End Views (See: Diagrams/Connector Views/Component Connector End Views)
Description and Operation
Data Link Communications Description and Operation (See: Description and Operation)
Electrical Information Reference
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Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
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Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
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Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
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Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning/Control Module References)for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector of the transmission control module (TCM).
2. Test for 108-132 ohms between the serial data circuit terminal 6 and terminal 7.
‹› If less than the specified range, test the serial data circuits for a short between them. If the circuits test normal, replace the 120 ohm resistor.
‹› If greater than the specified range, test the serial data circuits for open/high resistance. If the circuits test normal, replace the 120 ohm resistor.
3. Ignition ON, test for less than 1.0 volt between the serial data circuit terminal 6 and ground, and between terminal 7 and ground.
‹› If greater than the specified range, test the serial data circuit for a short to voltage.
4. Test for infinite resistance between the serial data circuit terminal 6 and ground, and between terminal 7 and ground.
‹› If less than the specified value, test the serial data circuit for a short to ground.
5. Test for 108-132 ohms between the serial data circuit terminal 37 and terminal 38.
‹› If less than the specified range, test the serial data circuits for a short between them. If the circuits test normal, replace the ECM.
‹› If greater than the specified range, test the serial data circuits for open/high resistance. If the circuits test normal, replace the ECM.
6. Ignition ON, test for less than 1.0 volt between the serial data circuit terminal 37 and ground, and between terminal 38 and ground.
‹› If greater than the specified range, test the serial data circuit for a short to voltage. If the circuits test normal, replace the ECM.
7. Test for infinite resistance between the serial data circuit terminal 37 and ground, and between terminal 38 and ground.
‹› If less than the specified value, test the serial data circuit for a short to ground. If the circuits test normal, replace the ECM.
8. If the circuits test normal, replace the TCM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests
and Procedures) after completing the repair.
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Control Module References (See: Testing and Inspection/Programming and Relearning/Control Module References)for module replacement,
setup, and programming
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GMLAN Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/GMLAN Wiring Repairs)
