Engine Oil Pressure Indicator Always On

Engine Oil Pressure 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 pressure (EOP) switch is a normally closed switch that opens with the proper oil pressure. With the ignition switch turned ON and the engine not running, the powertrain control module (PCM) should detect a low signal voltage input. With the engine running, the pressure switch opens, and the PCM should detect a high signal voltage input.

Circuit/System Testing

1. Ignition ON, engine ON, verify the scan tool Engine Oil Pressure Switch parameter is Low.

• If not Low, replace the instrument panel cluster (IPC).

2. Ignition OFF, disconnect the harness connector at the EOP switch.
3. Ignition ON, verify the scan tool Engine Oil Pressure Switch parameter is OK.

• If not OK, test the signal circuit of the EOP switch for a short to ground. If the circuit tests normal, replace the PCM.

4. If all circuits test normal, test or replace the EOP sensor.

Repair Instructions

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

* Engine Oil Pressure Sensor and/or Switch Replacement
* Refer to Programming and Relearning for PCM setup and programming. Programming and Relearning