P0520

DTC P0520

Diagnostic Instructions

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

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptor

DTC P0520
- Engine Oil Pressure (EOP) Switch Circuit

Diagnostic Fault Information






Circuit/System Description

The engine control module (ECM)/powertrain control module (PCM) monitors the signal circuit of the engine oil pressure (EOP) sensor. When the oil pressure is high, the sensor is open, and the ECM/PCM senses a high signal voltage. When the oil pressure is low, the sensor is closed, and the ECM/PCM senses a low signal voltage.

Conditions for Running the DTC

The ignition is ON, with the engine ON.

Conditions for Setting the DTC

* The ECM/PCM detects that the EOP sensor signal circuit is pulled low.
* The above condition is present for greater than 5 seconds.

Action Taken When the DTC Sets

* The ECM/PCM records the operating conditions at the time the diagnostic test fails. The ECM/PCM displays this information in the Failure Records on the scan tool.
* The instrument panel cluster (IPC) illuminates the engine oil pressure indicator.

Conditions for Clearing the DTC

* The DTC becomes history when the conditions for setting the DTC are no longer present.
* The history DTC clears after 40 malfunction-free warm-up cycles.
* The ECM/PCM receives a clear code command from the scan tool.

Diagnostic Aids

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the EOP.
2. Ignition ON, install a 3-amp fused jumper between the signal circuit and ground. Verify the scan tool Low Oil Pressure Switch parameter is Closed or the scan tool Low Oil Pressure parameter is Yes.

• If not Closed or Yes, test the signal circuit of the EOP switch for an open/high resistance. If the circuit tests normal, replace the ECM/PCM.

3. If all circuits test normal, test or replace the EOP switch.

Repair Instructions

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

* Engine Oil Pressure Sensor and/or Switch Replacement for the 2.2L engine
* Engine Oil Pressure Sensor and/or Switch Replacement for the 2.4L engine
* Engine Oil Pressure Sensor and/or Switch Replacement for the 3.5L engine
* Control Module References for ECM/PCM replacement, setup, and programming