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Test E: Oil Pressure Gauge Always Indicates Low (Oil Pressure Warning On With Normal Oil Pressure)

  1. Ensure oil pressure is normal. See appropriate article in ENGINES. Go to next step.
  2. Disconnect Blue/Green wire from oil pressure gauge switch. Start engine and let it idle (less than 1000 RPM). If oil pressure warning light is on, go to next step. If oil pressure warning light is not on, go to step  4 .
  3. Check for short to ground in Blue/Green wire between oil pressure gauge switch and gauge cluster harness connector terminal No. 15. See Figure . Repair circuit as necessary and go to step  5 . If circuit is okay, go to step  6 .
  4. Increase engine speed to more than 1000 RPM. If oil pressure warning buzzer operates, go to step  6 . If oil pressure warning buzzer does not operate, go to step  7 .
  5. Reconnect all harness connectors and reinstall all components. Check operation of oil pressure warning light and buzzer. If warning light and buzzer operate properly, system is okay. If warning light or buzzer does not operate properly, go to step  8 .
  6. Inspect gauge cluster harness connector for poor connections. Repair connector as necessary and go to step  5 . If connector is okay, go to step  8 .
  7. Replace oil pressure gauge switch. Go to step  5 .
  8. Replace gauge cluster. See INSTRUMENT CLUSTER GAUGES  under REMOVAL & INSTALLATION. System is okay.
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