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Test U: Check Engine Light Inoperative

NOTE: CHECK ENGINE light may also be referred to as Malfunction Indicator Light (MIL).
  1. Turn ignition switch to LOCK position. Disconnect Powertrain Control Module (PCM) harness connector C421. Connect breakout box to PCM harness connector C421. Using a fused jumper wire, connect terminals No. 2 and 24 at breakout box. Turn ignition switch to RUN position. If CHECK ENGINE light does not illuminate, go to next step. If CHECK ENGINE light illuminates, repair powertrain control concern. See SELF-DIAGNOSTICS - EEC-V (GASOLINE) article in ENGINE PERFORMANCE.
  2. Turn ignition switch to LOCK position. Disconnect instrument cluster harness connector C808B. Measure resistance in Black/Orange wire between terminal No. 2 at breakout box and terminal No. 3 at instrument cluster harness connector C808B. See Figure . If resistance is 5 ohms or less, inspect CHECK ENGINE indicator bulb and replace as necessary. If bulb is okay, replace instrument cluster printed circuit. If resistance is more than 5 ohms, repair open in Black/Orange wire.
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