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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. Install the scan tool. Turn ignition on, engine off. Record the DTC failure records. Start the engine. Using the scan tool, check ignition voltage. Is the voltage 9-18 volts? If so, go to next step. If not, see DTC P0562: SYSTEM VOLTAGE LOW  or DTC P0563: SYSTEM VOLTAGE HIGH  .
  3. Drive the vehicle under normal operating conditions. Using the scan tool, monitor TCC enable status. Does the scan tool indicate that TCC slip speed is above 130 RPM when TCC enable status is "ON"? If so, go to next step. If not, see DIAGNOSTIC AIDS .
  4. This condition indicates that the TCC is mechanically stuck off. Check for the following conditions:
    • Worn TCC clutch.
    • Faulty solenoid "F".
    • Debris in the TCC valve bore.
    • Clogged converter relief passage.

    Was a condition found and repaired? If so, go to next step.

  5. Perform the following procedure to verify the repair:
    • Clear the DTC.
    • Drive the vehicle under normal operating conditions.
    • Using the scan tool, monitor TCC slip speed. The TCC must engage and disengage when commanded.

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

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