2000 Saturn SW2 AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Oil Level Switch: 5.7L

  1. Turn ignition on, with engine off. Raise and support vehicle. Disconnect engine oil level switch harness connector. Using DVOM, measure voltage between engine oil level switch input circuit (Brown wire) at engine oil level switch harness connector and chassis ground. If battery voltage is present, go to next step. If battery voltage is not present, go to step  3.
  2. Using DVOM, measure voltage between engine oil level switch harness connector terminals. If battery voltage is present, go to step  5. If battery voltage is not present, go to step  6.
  3. Turn ignition off. Disconnect PCM harness connector C1. Using DVOM, check continuity of engine oil level switch input circuit (Brown wire). If continuity exists, go to next step. If continuity does not exist, go to step  7.
  4. Using a test light connected to battery voltage, probe engine oil level switch input circuit (Brown wire) at engine oil level switch harness connector. If test light illuminates, go to step  8. If test light does not illuminate, go to step  9.
  5. Check for poor connection at engine oil level switch. If problem does not exist, go to step  11. If problem exists, repair as necessary.
  6. Repair open in engine oil level switch ground circuit.
  7. Repair open in engine oil level switch input circuit.
  8. Repair short to ground in engine oil level switch input circuit.
  9. Check for poor connections at PCM. If problem does not exist, go to next step. If problem exists, repair as necessary.
  10. Replace PCM.
  11. Replace engine oil level switch.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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