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Malfunction Indicator Light Always On

  1. If powertrain diagnostic system check was performed, go to next step. If powertrain diagnostic system check was not performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under DIAGNOSTIC SYSTEM CHECKS.
  2. Turn ignition on. If Malfunction Indicator Light (MIL) turns off when ignition is turned on, go to step  5. If MIL does not turn off when ignition is turned on, go to next step.
  3. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. See Figure. Turn ignition on. Monitor Malfunction Indicator Light (MIL). If MIL illuminates, go to next step. If MIL does not illuminate, go to step  7.
  4. Turn ignition off. Remove the Instrument Panel Cluster (IPC). See REMOVAL & INSTALLATION in appropriate ANALOG INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Using DVOM, measure resistance between ground and IPC connector terminal B16 (Brown/White wire). See Figure. If resistance is more than 5 ohms, go to step  6. If resistance is 5 ohms or less, repair short to ground in Brown/White wire. After repairs, go to step  8
  5. Repair short to voltage in Brown/White wire between PCM and IPC. After repairs, go to step  8.
  6. Replace IPC. After repairs, go to step  8.
  7. Replace PCM. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After repairs, go to next step.
  8. Recheck operation on MIL. If MIL operates properly, repair is complete. If MIL does not operate properly, go to step  3.
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