Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0522: Engine Oil Pressure (EOP) Sensor Circuit Low Voltage.DTC P0523: Engine Oil Pressure (EOP) Sensor Circuit High Voltage
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
Engine Oil Pressure 5-Volt Reference | P0522 | 1 | P0522 | P0523 | -- |
Engine Oil Pressure Sensor Signal | P0522 | 1 | P0522 | P0523 | -- |
Low Reference | -- | 1 | P0523 | -- | -- |
1. Engine Oil Pressure Gage Inaccurate or Inoperative | |||||
Circuit Description
The engine oil pressure (EOP) sensor changes resistance based on engine oil pressure. The engine control module (ECM) monitors the signal circuit of the EOP sensor. When the engine oil pressure is high, the sensor resistance is high, and the ECM senses a high signal voltage. When the engine oil pressure is low, the sensor resistance is low, and the ECM senses a low signal voltage. The ECM sends the engine oil pressure information to the instrument panel cluster (IPC) via the class 2 serial data circuit.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
P0522
| • | The ECM detects that the EOP sensor signal circuit is less than 0.4 volts. |
| • | The above condition is present for greater than 9 seconds. |
P0523
| • | The ECM detects that the EOP sensor signal circuit is greater than 4.6 volts. |
| • | The above condition is present for greater than 9 seconds. |
Action Taken When the DTC Sets
The ECM/PCM records the operating conditions at the time the diagnostic test fails. The ECM displays this information in the Failure Records on the scan tool.
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
Connector End View Reference
Description and Operation
Instrument Cluster Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
- Ignition ON, perform the engine oil gage sweep test with the scan tool. Verify that the engine oil pressure gage sweeps from its low to high position.
- Engine running, observe the scan tool Engine Oil Pressure Sensor parameter. The reading should be between 0.5-4.5 volts.
| ⇒ | If the engine oil pressure gage does not sweep, replace the IPC. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the EOP sensor.
- Ignition OFF, test for less than 1 ohm between the low reference circuit terminal 1 and ground.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 and ground.
- Install a 3-amp fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1. Verify the scan tool Engine Oil Pressure Sensor parameter is less than 0.4 volt.
- Install a 3-amp fused jumper wire between the signal circuit terminal 2 and the 5-volt reference circuit terminal 3. Verify the scan tool Engine Oil Pressure Sensor parameter is greater than 4.6 volts.
- If all circuits test normal, test or replace the EOP sensor.
| ⇒ | If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. |
| ⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the ECM. |
| ⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
| ⇒ | If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. |
| ⇒ | If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for the ECM replacement, setup, and programming
