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Test L: Check Engine Light (Mil) Inoperative

NOTE: Voltage measurement in step 1) is for prove out circuit. Voltage will only exist for a few seconds when key is turned to RUN position.
  1. Turn ignition switch to RUN position. Disconnect instrument cluster connector C225. Measure voltage between ground and terminal No. 5 (Pink/Light Green wire) at instrument cluster connector C225 (component side). See Figure and Figure . If battery voltage is not present, go to step  3. If battery voltage exists, go to next step.
  2. Turn ignition switch to LOCK position. Disconnect instrument cluster connector C225 and PCM harness connector C154. Measure resistance of Pink/Light Green wire between terminal No. 2 at PCM harness connector C154 and terminal No. 5 at instrument cluster connector C225. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Pink/Light Green wire between PCM and instrument cluster. See WIRING DIAGRAMS . Retest system.
  3. Remove service engine soon warning light bulb. Check continuity between terminals of bulb. If continuity exists, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Retest system. If continuity does not exist, replace bulb. Retest system.
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