P0520
DTC P0520
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptor
DTC P0520
- Engine Oil Pressure (EOP) Sensor Circuit
Diagnostic Fault Information
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 engine control module (ECM) should detect a low signal voltage input. With the engine running, the pressure switch opens, and the ECM should detect a high signal voltage input. When the oil pressure is low, the ECM sends a serial data message to the body control module (BCM) requesting the EOP indicator turned ON. The IPC illuminates the EOP indicator when the IPC receives a serial data message from the BCM requesting the EOP indicator turned ON.
Conditions for Running the DTC
The ignition is ON, with the engine ON.
Conditions for Setting the DTC
* The ECM detects that the EOP sensor signal circuit is pulled high.
* The above condition is present for greater than 5 seconds.
Action Taken When the DTC Sets
* The ECM records the operating conditions at the time the diagnostic test fails. The ECM 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.
Reference Information
Schematic Reference
Instrument Cluster Schematics (Instrument Cluster Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
* Instrument Cluster Description and Operation (Description and Operation)
* Indicator/Warning Message Description and Operation (Indicator/Warning Message Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, engine running, verify the scan tool Engine Oil Pressure Switch parameter is OK.
If not the specified value, refer to:
* Oil Pressure Diagnosis and Testing (Component Tests and General Diagnostics) for the 2.0L engine.
* Oil Pressure Diagnosis and Testing (Component Tests and General Diagnostics) for the 2.2L or 2.4L engine.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the engine oil pressure (EOP) switch.
2. Ignition ON, verify the scan tool Engine Oil Pressure Switch parameter is OK.
• If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the ECM.
3. Ignition ON, install a 3-A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Engine Oil Pressure Switch parameter is Low.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
4. If all circuits test normal, replace the engine oil pressure switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Engine Oil Pressure Switch Replacement (Service and Repair) for the 2.2L or 2.4L engine
* Control Module References (Programming and Relearning) for the ECM replacement, setup, and programming