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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 100 (Engine Control System Self-Diagnostics - 3.8L) >> System Tests >> Mil Always On >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 Pontiac Grand Prix, 2002 Pontiac Bonneville, 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, and 2002 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing Diagnostic System Check - Engine Controls, go to next step.
  2. Turn ignition on, engine off. If MIL turns off when ignition is turned on, go to step  5. If MIL does turn off when ignition is turned on, go to next step.
  3. Turn ignition off. Disconnect PCM. Turn ignition on, engine off. Observe MIL. If MIL is on, go to next step. If MIL is off, go to step  7.
  4. Remove IPC. Check Brown/White wire between PCM and IPC for a short to ground. If problem was found, repair as necessary. After repairs, go to step  8. If problem was not found, go to step  6.
  5. Repair short to voltage in Brown/White wire between IPC and PCM. After repairs, go to step  8.
  6. Replace IPC. After repairs, go to step  8.
  7. Replace PCM. After repairs, go to next step.
  8. Operate system to verify repair.
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