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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 92 (Engine Controls - Self-Diagnostics - 6.6L Diesel) >> System Tests >> Malfunction Indicator Lamp Inoperative >> Diagnostic Procedures

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. Inspect the fuse that supplies voltage to the MIL. Is the fuse open? If yes, go to step  10. If no, go to next step.
  3. Turn OFF the ignition. Disconnect the ECM. Turn ON the ignition, with the engine OFF. Connect a 3-amp fused jumper wire between the MIL control circuit and a good ground. Observe the MIL. Does the MIL illuminate? If yes, go to step  9. If no, go to next step.
  4. Did the fuse in the jumper wire open? If yes, go to step  11. If no, go to next step.
  5. Remove the Instrument Panel Cluster (IPC). See appropriate ANALOG INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Test the MIL control circuit for an open between the ECM and the IPC and repair as necessary. Did you find and correct the condition? If yes, go to step  14. If no, go to next step.
  6. Probe the MIL battery positive voltage circuit at the IPC harness connector with a test lamp connected to a good ground. Does the test lamp illuminate? If yes, go to step  8. If no, go to next step.
  7. Repair the open in the MIL battery positive voltage circuit. After repairs, go to step  14.
  8. Inspect for poor connections at the harness connector of the IPC and repair as necessary. Did you find and correct the condition? If yes, go to step  14. If no, go to step  12.
  9. Inspect for poor connections at the harness connector of the ECM and repair as necessary. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  10. Repair the short to ground in the MIL battery positive voltage circuit. Replace the fuse. After repairs, go to step  14.
  11. Repair the short to voltage in the MIL control circuit. After repairs, go to step  14.
  12. Replace the IPC. See appropriate ANALOG INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. After repairs, go to step  14.
  13. Replace the ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram ECM. See ENGINE CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  14. 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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