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Home >> Oldsmobile >> 2003 >> Bravada AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.2L >> System Tests >> Malfunction Indicator Light Inoperative >> Diagnostic Procedures
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Diagnostic Procedures

  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 fuse that supplies voltage to the MIL. Is fuse open? If yes, go to step  10. If no, go to next step.
  3. Turn ignition off. Disconnect the PCM. See COMPONENT LOCATIONS . Turn ignition on, with engine off. Connect a 3-amp fused jumper wire between the MIL control circuit and a good ground. Observe the MIL. Is the MIL illuminated? 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 PCM 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 light connected to a good ground. Does the test light illuminate? If yes, go to step  8. If no, go to next step.
  7. Repair 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 PCM 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 short to ground in the MIL battery positive voltage circuit. Replace fuse. After repairs, go to step  14.
  11. Repair short to voltage in the MIL control circuit. After repairs, go to step  14.
  12. Repair or replace the IPC. See appropriate ANALOG INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. After repairs, go to step  14.
  13. Replace PCM. See REMOVAL & INSTALLATION - BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article. Reprogram PCM. See POWERTRAIN 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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