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Engine Oil Level Switch: 4.6L

  1. Ensure engine oil level is at full mark on dipstick. Install scan tool. Turn ignition on, with engine off. Using scan tool, observe engine oil level display. If scan tool displays OK, go to next step. If scan tool does not display OK, go to step  3.
  2. Start engine and let idle. Increase engine speed to 2300 RPM while monitoring oil level on scan tool. If scan tool displays LOW, no fault is present at this time. If scan tool does not display LOW, go to step  6.
  3. Disconnect engine oil level switch harness connector. Connect a fused jumper wire between engine oil level switch harness connector terminals. Observe scan tool display. If scan tool displays OK, go to step  11. If scan tool does not display OK, go to next step.
  4. Connect a fused jumper wire between engine oil level switch harness connector input circuit (Brown wire) and chassis ground. Observe scan tool display. If scan tool displays OK, go to step  9. If scan tool does not display OK, go to next step.
  5. Turn ignition off. Remove fused jumper wire. Disconnect PCM harness connector C2. Using DVOM, measure resistance in engine oil level input circuit (Brown wire) between PCM connector C2 and engine oil level switch harness connector. If resistance is 5 ohms or less, go to step  13. If resistance is greater than 5 ohms, go to step  8.
  6. Turn ignition on, with engine off. Disconnect engine oil level switch harness connector. Observe scan tool display. If scan tool displays LOW, go to step  11. If scan tool does not display LOW, go to next step.
  7. Turn ignition off. Disconnect PCM harness connector C2. Using DVOM, measure resistance in engine oil level input circuit (Brown wire) between engine oil level switch harness connector and chassis ground. If resistance is 10,000 ohms or greater, go to step  13. If resistance is less than 10,000 ohms, go to step  10.
  8. Locate and repair open in engine oil level input circuit.
  9. Locate and repair open in engine oil level ground circuit.
  10. Locate and repair short to ground in engine oil level switch input circuit.
  11. Check for poor connections at engine oil level switch. If problem exists, repair as necessary. If problem does not exist, go to next step.
  12. Replace engine oil level switch.
  13. Check for poor connections at PCM. If problem exists, repair as necessary. If problem does not exist, go to next step.
  14. Replace PCM.
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