Circuit/System Testing

With the ignition ON and the scan tool installed, observe the Low Engine Oil Level Indicator display in the IPC and the scan tool Low Engine Oil Level Indicator Command parameter in the ECM/PCM IPC Data List.
- If the Low Engine Oil Level Indicator does not display in the IPC and the scan tool Low Engine Oil Level Indicator Command parameter displays OFF, check for a poor connection at the harness connector of the engine oil level switch.
With the scan tool installed, observe the Engine Oil Level Switch parameter in the ECM/PCM Engine Data List.
- If the Engine Oil Level Switch parameter displays OK, replace the IPC.
With the ignition OFF, disconnect the engine oil level switch.
Connect a 3-amp fused jumper wire between the engine oil level switch signal circuit and a good ground.
With the ignition ON, and the scan tool installed, observe the Engine Oil Level Switch parameter in the ECM/PCM Engine Data List.
- If the Engine Oil Level Switch parameter displays OK, check the engine oil level switch ground circuit for an open or a high resistance.

If the engine oil level switch ground circuit tests normal, replace the engine oil level switch.

If the Engine Oil Level Switch parameter displays LOW, check the engine oil level signal circuit for an open, a high resistance or a short to voltage.