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Test S: Malfunction Indicator Light Inoperative: Testing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 GMC Savana Special, 2001 GMC Savana Camper Special, 2001 GMC Savana, 2001 Chevrolet RV Cutaway, and 2001 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. If engine controls diagnostic system check diagnostic system check has been performed, go to next step. If engine controls diagnostic system check diagnostic system check has not been performed, go to ENGINE CONTROLS DIAGNOSTIC SYSTEM CHECK  .
  2. Inspect fuse that supplies voltage to MIL. If fuse is open, go to step  9 . If fuse is not open, go to next step.
  3. Turn ignition switch to OFF position. Disconnect Powertrain Control Module (PCM) harness connectors. Turn ignition switch to RUN position. If MIL is not illuminated, go to next step. If MIL is illuminated, go to step  8 .
  4. If fuse in jumper wire opened, go to step  10 . If fuse in jumper wire is not open, go to next step.
  5. Remove Instrument Panel Cluster (IPC). Check for short to ground in Brown/White wire (MIL control circuit) between PCM harness connector C2 terminal No. 48 and IPC harness connector terminal A2. See Figure and Figure . If condition is found, repair as necessary and go to step  13 . If no condition is found, 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. If test lamp illuminates, go to step  8 . If test lamp does not illuminate, go to next step.
  7. Repair the open in the MIL battery positive voltage circuit, then go to step  13 .
  8. Inspect the IPC harness connector for poor connections. If poor connection is found, repair as necessary and go to step  13 . If poor connection is not found, go to step  11 .
  9. Repair short to ground in MIL battery positive voltage circuit. Replace the fuse. After repair, go to step  13 .
  10. Repair short to voltage in battery positive voltage circuit. After repair, go to step  13 .
  11. Replace IPC. After repair, go to step  13 .
  12. Replace PCM. Program as necessary. See PROGRAMMING  . After repair, go to next step.
  13. Operate system to verify fault no longer exists. If fault still exists, go to step  2 .
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