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Home >> Chevrolet >> 1997 >> Venture LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Basic Engine Testing >> On-Board Diagnostic (OBD) System Check >> Malfunction Indicator Light (Mil)
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Malfunction Indicator Light (Mil)

  1. Perform On-Board Diagnostic (OBD) System Check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  . After performing OBD system check, go to next step.
  2. Attempt to start engine. If engine starts, go to next step. If engine does not start, go to step 6).
  3. Check instrument cluster ignition feed circuit fuse. See the WIRING DIAGRAMS article. If fuse is okay, go to next step. If fuse is faulty, go to step 15).
  4. Turn ignition on. Using test light connected to ground, probe ignition feed circuit at cluster connector. See the WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 12).
  5. Turn ignition off. Disconnect PCM harness connector. Turn ignition on. Using a fused jumper wire, connect MIL driver circuit at PCM to ground. See the WIRING DIAGRAMS article. If MIL illuminates, go to step 10). If MIL does not illuminate, go to step 11).
  6. Check PCM ignition feed and battery feed fuses. If both fuses are okay, go to step 7). If fuse(s) are faulty, go to step 14).
  7. Turn ignition off. Disconnect PCM harness connector. Using a test light connected to ground, probe ignition feed circuit at PCM harness connector terminal. See the WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 13).
  8. With test light connected to ground, probe battery feed circuit at PCM harness connector terminal. See the WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 13).
  9. Check for faulty PCM or poor PCM ground connection. Repair as necessary. After repairs, perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  . If circuit is okay, go to next step.
  10. Check for poor PCM connection. Repair as necessary. After repairs, perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  . If PCM connection is okay, go to step 16).
  11. Check for open in MIL driver circuit. Repair as necessary. After repairs, perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  . If circuit is okay, go to step 17).
  12. Repair open in ignition feed circuit to instrument cluster indicators. After repairs, perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  .
  13. Locate and repair open in PCM battery feed circuit or PCM ignition feed circuit. After repairs, perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  .
  14. Locate and repair short to ground in PCM ignition feed circuit or PCM battery feed circuit. After repairs, perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  .
  15. Locate and repair short to ground in feed circuit to instrument cluster indicators. After repairs, perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  .
  16. Replace PCM. Perform PCM relearn procedures. After repairs, perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  .
  17. Check for poor connection at MIL driver circuit in instrument cluster connector. Repair as necessary. After repairs, perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  . If MIL driver circuit connections are okay, diagnose instrument panel. See the INSTRUMENT PANEL article in the ACCESSORIES/SAFETY EQUIPMENT section.
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