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Home >> Saturn >> 2000 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Testing & Engine Component Testing >> Engine Sensors & Switches >> Engine Oil Pressure Switch >> 3.5L
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Engine Oil Pressure Switch: 3.5L

  1. Install scan tool. Turn ignition on, with engine off. Using scan tool, observe engine oil pressure display. If scan tool displays LOW, go to next step. If scan tool does not display LOW, go to step  6.
  2. Start engine. If scan tool displays OK, no fault is present at this time. If scan tool does not display OK, go to next step.
  3. Turn ignition off. Check engine oil level. If oil level is okay, go to next step. If oil level is not okay, go to step  10.
  4. Using a manual oil pressure gauge, check engine oil pressure. If engine oil pressure is correct, go to next step. If engine oil pressure is not correct, go to step  11.
  5. Turn ignition off. Disconnect engine oil pressure switch harness connector. Turn ignition on. If scan tool displays OK, go to step  13. If scan tool does not display OK, go to step  8.
  6. Disconnect engine oil pressure switch harness connector. Connect a jumper wire between engine oil pressure switch harness connector terminals. If scan tool displays LOW, go to step  13. If scan tool does not display LOW, go to next step.
  7. Connect a jumper wire between engine oil pressure switch harness connector input circuit (Tan/Black wire) and chassis ground. If scan tool displays LOW, go to step  9. If scan tool does not display LOW, go to step  12.
  8. Check for a short to ground in engine oil pressure switch input circuit (Tan/Black wire). If problem does not exist, go to step  14. If problem exists, repair as necessary and go to step  15.
  9. Repair open in engine oil pressure switch ground circuit (Black/White wire). After repairs, go to step  15.
  10. Determine cause of low engine oil level and repair as necessary. After repairs, go to step  15.
  11. Determine cause of low engine oil pressure and repair as necessary. After repairs, go to step  15.
  12. Check for an open in engine oil pressure switch input circuit (Tan/Black wire). Also, check for poor connections at PCM. If problem does not exist, go to next step. If problem exists, repair as necessary and go to step  15.
  13. Replace engine oil pressure switch. After repairs, go to step  15.
  14. Replace PCM. After repairs, go to step  15.
  15. Using scan tool, monitor engine oil pressure with ignition on, engine off. Also, monitor engine oil pressure with engine running. If scan tool displays LOW with ignition on, engine off and OK with engine running, system is okay. If scan tool display is not as specified, go to step  1.
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