Diagnostic Procedures
- Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
- Turn ignition off. Disconnect PCM. Turn ignition on, with engine off. Observe the MIL. Is the MIL illuminated? If yes, go to next step. If no, go to step 5.
- Remove the Instrument Panel Cluster (IPC). Test the MIL control circuit for a short to ground between the PCM and IPC. Did you find and correct the condition? If yes, go to step 6. If no, go to next step.
- Replace IPC. After replacing IPC, go to step 6.
- Replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE REPROGRAMMING under PROGRAMMING. After repairs, go to next step.
- Operate the system in order to verify the repair. Did you correct the condition? If yes, system is okay. If no, go to step 2.