Low Engine Oil Level Indicator Always On

Low Engine Oil Level Indicator Always On

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

Circuit/System Description

The engine oil level switch is a normally closed switch that opens when there is a low engine oil 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 condition the ECM/PCM sends a serial data message to the instrument panel cluster (IPC) requesting illumination of the LOW OIL LEVEL message in the IPC.

Circuit/System Testing

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

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

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

• If not OK, test the signal circuit 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.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Engine Oil Level Sensor and/or Switch Replacement for the 3.6L engine
* Engine Oil Level Sensor and/or Switch Replacement for the 3.8L engine
* Refer to Programming and Relearning for ECM/PCM replacement, setup and programming. Programming and Relearning