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Test F: Engine Oil Pressure 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. Start engine. If engine oil pressure indicator illuminates after bulb check, go to next step. If engine oil pressure indicator does not illuminate after bulb check, check oil pressure indicator circuit for intermittent condition by performing tests while wiggling related wiring and connectors. This can often cause malfunction to appear.
  3. Connect scan tool to Data Link Connector (DLC). DLC is located at lower left side of instrument panel, near steering column. Using scan tool, observe ENGINE OIL PRESSURE SWITCH parameter in PCM ENGINE DATA 3 data list. If ENGINE OIL PRESSURE SWITCH parameter does not display OK, go to next step. If ENGINE OIL PRESSURE SWITCH parameter displays OK, go to step  10.
  4. Turn ignition switch to LOCK position. Disconnect engine oil pressure switch 1-pin harness connector. Engine oil pressure switch is located on rear center of engine. Start engine. Using scan tool, observe ENGINE OIL PRESSURE SWITCH parameter. If ENGINE OIL PRESSURE SWITCH parameter does not display OK, go to next step. If ENGINE OIL PRESSURE SWITCH parameter displays OK, go to step  6.
  5. Check for short to ground in Tan/Black wire between engine oil pressure switch harness connector and Powertrain Control Module (PCM). If problem is not found, go to step  7. If problem is found, repair Tan/Black wire. After repairs, go to step  11.
  6. Check for poor connections at engine oil pressure switch harness connector. If problem is not found, go to step  8. If problem is found, repair as necessary. After repairs, go to step  11.
  7. Check for poor connections at PCM harness connector. If problem is not found, go to step  9. If problem is found, repair as necessary. After repairs, go to step  11.
  8. Replace engine oil pressure switch. After repairs, go to step  11.
  9. Replace and program PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. See POWERTRAIN CONTROL MODULE PROGRAMMING . After repairs, go to step  11.
  10. Replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION.
  11. Check system for proper operation. If system operates properly, test is complete. If system does not operate properly, go to step  2.
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