Diagnostic Instructions
Perform the
Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Circuit/System Description
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.
Diagnostic Aids
The low engine oil level indicator is also used as the change engine oil indicator. When the indicator is flashing a low engine oil level condition is present and when solid and not flashing the engine oil needs to be changed.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Scan Tool Data List
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the engine oil level switch.
- 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. |
- 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. |
- If all circuits test normal, test or replace the engine oil level switch.
Repair Instructions