Engine Oil Pressure Sensor/Switch Diagnosis

Circuit Description
The Engine Oil Pressure sensor is mounted at the top rear of the engine. The Engine Oil Pressure sensor measures changes in engine oil pressure. The Engine Oil Pressure sensor has a 5 volt reference, a ground and a signal circuit.

The Engine Oil Pressure sensor changes resistance based on changes in engine oil pressure. The PCM sends the engine oil pressure sensor information to the Instrument Panel Cluster (IPC) via the class 2 circuit. When the engine oil pressure is out of range the Driver Information Center displays a message.

Diagnostic Aids:

Important:
^ Remove any debris from the PCM/TAC module connector surfaces before servicing the PCM/TAC module. Inspect the PCM/TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM/TAC modules.
^ For any test that requires probing the PCM or a component harness connector, use the Connector Test Adapter Kit J 35616-A. Using this kit prevents damage to the harness/component terminals.
^ The following may cause an intermittent:
- Poor connections.
- Mis-routed harness.
- Rubbed through wire insulation.
- Broken wire inside the insulation.
^ Inspect the ground circuit for an open if the EOP gauge displays the maximum pressure.
^ For an intermittent, refer to Symptoms. Symptom Related Diagnostic Procedures

Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. This step determines if the malfunction is present.
4. This step tests if the ground circuit is open.
5. This step tests if the signal circuit is shorted to a voltage.
6. This step verifies if a ground circuit is available at the Engine Oil Pressure sensor.