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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 83 (Engine Controls Self-Diagnostics - 2.2L) >> System Tests >> Mil Inoperative >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 GMC Sonoma and 2002 Chevrolet S10 Pickup. 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, perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Inspect fuse that supplies voltage to MIL. Is fuse open? If yes, go to step  10. If no, go to next step.
  3. Turn OFF ignition. Disconnect PCM. Turn ON ignition, with engine OFF. Connect a 3-amp fused jumper wire between MIL control circuit and a good ground. Observe MIL. Is MIL illuminated? If yes, go to step  9. If no, go to next step.
  4. Did fuse in the jumper wire open? If yes, go to step  11. If no, go to next step.
  5. Remove Instrument Panel Cluster (IPC). Test MIL control circuit for open between PCM and IPC. 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 IPC harness connector with a test light connected to a good ground. Does test light illuminate? If yes, go to step  8. If no, go to next step.
  7. Repair open in MIL battery positive voltage circuit. After repairs, go to step  14.
  8. Inspect for poor connections at IPC harness connector. Repair as necessary. Did you find and correct condition? If yes, go to step  14. If no, go to step  12.
  9. Inspect for poor connections at PCM harness connector. Repair as necessary. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  10. Repair short to ground in MIL battery positive voltage circuit. Replace fuse. After repairs, go to step  14.
  11. Repair short to voltage in MIL control circuit. After repairs, go to step  14.
  12. Replace the IPC. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. When complete, go to step  14.
  13. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, 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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