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Test Q: Fuel Cap Missing Indicator Always On

  1. If instrument panel cluster diagnostic system check has been performed, go to next step. If instrument panel cluster diagnostic system check has not been performed, go to INSTRUMENT PANEL CLUSTER DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition switch to OFF position. Disconnect Engine Control Module (ECM) 64-pin harness connector C2. Turn ignition switch to RUN position. If FUEL CAP indicator is on, go to next step. If FUEL CAP indicator is not on, go to step  4 .
  3. Check for short to ground in fuel cap indicator control circuit (Gray wire) between ECM harness connector C2 terminal No. 22 and IPC harness connector terminal No. 3. See Figure and Figure . If problem is found, repair as necessary and go to step  6 . If no problem is found, go to step  5 .
  4. Replace ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. After repairs are made, go to step  6 .
  5. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. After repairs are made, go to next step.
  6. Operate system to verify repair. If symptom operates normally, testing complete. If system does not operate normally, go to step  2 .
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