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Home >> Saturn >> 2000 >> SW2 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Testing & Engine Component Testing >> Engine Sensors & Switches >> Engine Oil Level Switch >> 3.5L
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Engine Oil Level Switch: 3.5L

  1. If low oil level indicator is illuminated, go to next step. If low oil level indicator is not illuminated, go to step  7.
  2. Install scan tool. Using scan tool, observe engine oil level display. If scan tool displays LOW, go to next step. If scan tool does not display LOW, diagnose instrument cluster.
  3. Turn ignition off and allow engine oil to drain back. Check engine oil level. If oil level is okay, system is okay. If oil level is not okay, go to next step.
  4. Disconnect engine oil level switch harness connector. Turn ignition on, with engine off. Using DVOM connected to ground, measure voltage of engine oil level switch signal circuit (Brown wire) at engine oil level switch harness connector. If battery voltage is present, go to next step. If battery voltage is not present, go to step  11.
  5. Using DVOM connected to ground, measure resistance of engine oil level switch ground circuit (Black/White wire) at engine oil level switch harness connector. If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, go to step  13.
  6. Using DVOM, measure resistance between engine oil level switch harness connector terminals. If resistance is 5 ohms or less, go to step  15. If resistance is greater than 5 ohms, go to step  16.
  7. Turn ignition off. Disconnect engine oil level switch harness connector. Start engine. Using scan tool, observe engine oil level display. If scan tool displays LOW, go to next step. If scan tool does not display LOW, go to step  9.
  8. If low oil level indicator is illuminated, go to step  16. If low oil level indicator is not illuminated, diagnose instrument cluster.
  9. Turn ignition on, with engine off. Using DVOM connected to ground, measure voltage of engine oil level switch signal circuit (Brown wire) at engine oil level switch harness connector. If battery voltage is present, go to step  18. If battery voltage is not present, go to next step.
  10. Turn ignition off. Disconnect PCM harness connector C2. Using DVOM, check for continuity between engine oil level switch signal circuit (Brown wire) at PCM harness connector and chassis ground. If continuity exists, go to step  14. If continuity does not exist, go to step  18.
  11. Turn ignition off. Disconnect PCM harness connector C2. Using DVOM, check for continuity of engine oil level switch signal circuit (Brown wire). If continuity exists, go to step  17. If continuity does not exist, go to next step.
  12. Repair open or high resistance in engine oil level switch signal circuit.
  13. Repair engine oil level switch ground circuit.
  14. Repair short to ground in engine oil level switch signal circuit.
  15. Check for poor connections at engine oil level switch. If problem exists, repair as necessary. If problem does not exist, go to next step.
  16. Replace engine oil level switch.
  17. Check for poor connections at PCM. If problem exists, repair as necessary. If problem does not exist, go to next step.
  18. Replace PCM.
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