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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 >> 3.1L, 3.4L & 3.8L
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3.1L, 3.4L & 3.8L

  1. Turn ignition on, with engine off. Install scan tool and retrieve DTCs. If no DTCs are set, go to next step. If any DTCs are set, perform appropriate DTC test. See appropriate SELF-DIAGNOSTICS article.
  2. If engine oil pressure indicator illuminates, go to next step. If engine oil pressure indicator does not illuminate, go to step  15.
  3. 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. Using a test light connected to ground, probe engine oil pressure switch input circuit (Tan/Black wire) at engine oil pressure switch harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  8.
  6. Using a test light connected to battery voltage, probe engine oil pressure switch ground circuit (Black/White wire) at engine oil pressure switch harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  9.
  7. Check for poor connection at engine oil pressure switch. If problem does not exist, go to step  12. If problem exists, repair as necessary and go to step  15.
  8. Check for an open or short to ground in engine oil pressure switch input circuit (Tan/Black wire). Also, check for poor connections at PCM. If problem does not exist, go to step  14. If problem exists, repair as necessary and go to step  15.
  9. Locate and repair open in engine oil pressure switch ground circuit (Black/White wire). Also, on 3.8L, repair poor connections at underhood electrical center pass-through connector. On all models, 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 communication circuit for proper operation. 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 next step.
  15. Check engine oil pressure indicator for proper operation. If engine oil pressure indicator operates properly, system is okay. If engine oil pressure indicator does not operate properly, go to step  1.
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