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Diagnostic Procedures

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-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ON the ignition, with the engine OFF. Does the MIL turn OFF when the ignition is turned ON? If yes, go to step  5. If no, go to next step.
  3. Turn OFF the ignition. Disconnect the ECM. Turn ON the ignition, with the engine OFF. Observe the MIL. Does the MIL illuminate? If yes, go to next step. If no, go to step  7.
  4. Remove the Instrument Panel Cluster (IPC). See appropriate ANALOG INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Test the MIL control circuit for a short to ground between the ECM and the IPC. Did you find and correct the condition? If yes, go to step  8. If no, go to step  6.
  5. Repair the MIL control circuit for a short to voltage. After repairs, go to step  8.
  6. Replace the IPC. See appropriate ANALOG INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. After repairs, go to step  8.
  7. Replace the ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram ECM. See ENGINE CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  8. Operate the system in order to verify the repair. Did you correct the condition? If yes, system is okay. If no, go to step  2.
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