The engine oil level switch is a normally closed switch that opens when there is a low engine oil level condition. When the switch is open the engine control module (ECM)/powertrain control module (PCM) will detect a high signal voltage input. During a low engine oil level condition the ECM/PCM sends a serial data message to the instrument panel cluster (IPC) requesting display of the LOW OIL LEVEL message in the IPC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

1. Ignition OFF, disconnect the harness connector at the engine oil level switch.
2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit terminal B and ground.

⇒	If greater than 1 ohm, test the ground circuit terminal B for an open/high resistance.

3. Install a 3-amp fused jumper wire between the signal circuit terminal A and the ground circuit terminal B. Verify the scan tool Engine Oil Level Switch parameter is OK.

⇒	If not OK, test the signal circuit terminal A for an open/high resistance. If the circuit tests normal, replace the ECM/PCM.

4. If all circuits test normal, test or replace the engine oil level switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.