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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition off. Disconnect the C1 connector from the TCM. Check for open or shorts in delivered torque signal from TCM connector C1 terminal No. 16 to the PCM. Is there a short or open in the wiring harness? If so, go to next step. If not, go to step  4.
  3. Repair delivered torque signal circuit (464). Is the repair complete? If so, go to next step.
  4. Perform the following procedure to verify the repair:
    • Drive the vehicle under normal operating conditions.

    Did the DTC return? If so, go to step  1. If not, system is okay.

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