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Mil On Steady

NOTE: For circuit reference, see WIRING DIAGRAMS article.
  1. Perform diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check, go to next step.
  2. Turn ignition off. Disconnect PCM harness connector. Turn ignition on, with engine off. If MIL illuminates, go to next step. If MIL does not illuminate, go to step  5 .
  3. Turn ignition off. Check for short to ground in MIL control circuit (Purple/Yellow wire) between PCM and Instrument Panel Cluster (IPC) assembly. Repair as necessary. After repairs, go to step  6 . If circuit is okay, go to next step.
  4. Check the IPC assembly for a shorted circuit board. Repair or replace as necessary. After repairs, go to step  6 .
  5. Turn ignition off. Repair Purple/Yellow wire for short to voltage. After repairs, go to step  7 .
  6. Replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  7. Start engine and observe MIL. MIL should turn off in about 1-2 seconds after engine is started. If MIL turns off as specified, system is okay. If MIL does not turn off as specified, perform POWERTRAIN DIAGNOSTIC SYSTEM CHECK  .
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