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Test V: Check Engine Light Always On

NOTE: CHECK ENGINE light may also be referred to as Malfunction Indicator Light (MIL).
  1. Start engine. If CHECK ENGINE light illuminates and then goes out after engine is started, system is okay at this time. If CHECK ENGINE light illuminates and remains on after engine is started, repair powertrain control concern. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no powertrain control concern exists, go to next step.
  2. Turn ignition switch to LOCK position. Disconnect PCM harness connector C421. Turn ignition switch to RUN position. If CHECK ENGINE light does not illuminate, replace PCM. If CHECK ENGINE light illuminates, check for short to ground in Black/Orange wire. If short to ground does not exists, replace instrument cluster printed circuit.
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