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. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Engine Oil Pressure 5-Volt Reference Circuit | P0522 | P0522 | -- | P0521 |
Engine Oil Pressure Sensor Signal Circuit | P0522 | P0522 | P0523 | P0521 |
Low Reference | -- | P0523 | -- | P0521 |
Circuit/System Description
The engine oil pressure (EOP) sensor changes voltage based on the engine oil pressure. The EOP sensor is a 3-wire sensor comprising of the signal circuit, the low reference circuit and the 5-volt reference circuit. The engine control module (ECM) supplies 5 volts to the EOP sensor via the 5-volt reference circuit and provides ground via the EOP low reference circuit. The ECM monitors the signal circuit of the EOP sensor to determine the engine oil pressure sensor voltage is within the normal operating range of approximately 1-4 volts. When the engine oil pressure is high, the EOP sensor voltage is high and the ECM senses a high signal voltage. When the engine oil pressure is low, the EOP sensor voltage is low and the ECM senses a low signal voltage. The ECM sends the EOP information to the instrument panel cluster (IPC) via the serial data circuit.
Reference Information
Schematic Reference
Connector End View Reference
| • | Engine Controls Connector End Views for the 3.5L engine |
| • | Engine Control Module Connector End Views for the 3.9L engine |
| • | Engine Control Module Connector End Views for the 5.3L engine |
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
Ignition ON, scan tool installed, perform the Displays Test in the IPC Output Controls Special Functions . Verify that the engine oil pressure (EOP) indicator turns off after the Displays Test.
| ⇒ | If the EOP indicator does not turn off after the Displays Test, test or replace the IPC |
Repair Instructions
Perform the Diagnostic Repair Verification
| • | Control Module References for IPC replacement, setup and programming. |
