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Home >> GMC >> 2002 >> Jimmy 2D Utility, Part Time, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 4.3L >> System Tests >> Malfunction Indicator Lamp Always On >> Diagnostic Procedure
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Diagnostic Procedure

  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 OFF the ignition. Disconnect the PCM. See COMPONENT LOCATIONS . Turn ON the ignition, with the engine OFF. Observe the MIL. Is the MIL illuminated? If yes, go to next step. If no, go to step  5.
  3. 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 PCM and the IPC. Did you find and correct the condition? If yes, go to step  6. If no, go to next step.
  4. Repair or replace the IPC. See appropriate ANALOG INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. After repairs, go to step  6.
  5. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  6. 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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