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Mil On Steady

  1. Perform On-Board Diagnostic II (OBD-II) System Check. See ON-BOARD DIAGNOSTIC (OBD-II) SYSTEM CHECK in TESTS W/CODES - INTRODUCTION article. After performing OBD-II system check, go to next step.
  2. Turn ignition on with engine off. MIL should illuminate. If MIL does not illuminate, go to MALFUNCTION INDICATOR LIGHT (MIL) INOPERATIVE  . If MIL illuminates, go to next step.
  3. Install Tech 2 scan tool. Using scan tool, command MIL on and off. If MIL turns on and off when commanded, go to step 8). If MIL does not turn on and off when commanded, go to next step.
  4. Turn ignition off. Disconnect PCM connectors. Turn ignition on. If MIL does not illuminate, go to step 7). If MIL illuminates, go to next step.
  5. Check for short to ground in MIL control circuit (Brown/White wire) between instrument cluster and PCM. See WIRING DIAGRAMS article. Repair Brown/White as necessary. After repairs, go to step 8). If circuit is okay, go to next step.
  6. Replace Instrument Panel Cluster (IPC). After IPC replacement, go to step 8).
  7. Replace PCM. Program PCM. After repairs, go to next step.
  8. Using scan tool, clear DTC(s). Attempt to start engine. If engine starts and runs, go to next step. If engine does not start, or starts and dies, go to step 1).
  9. Warm engine to operating temperature. Check for DTCs. If DTCs are present, go to TESTS W/CODES - INTRODUCTION article. If DTC(s) are not present, system is okay.
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