• | 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. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
Engine Oil Pressure 5-Volt Reference | P0522 | 1 | P0522 | P0523 | P0521 |
Engine Oil Pressure Sensor Signal | P0522 | 1 | P0522 | P0523 | P0521 |
Low Reference | -- | 1 | P0523 | -- | P0521 |
1. Engine Oil Pressure Gage Inaccurate or Inoperative. |
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.
Control Module References for scan tool information
• | Oil Pressure Diagnosis and Testing for the 2.8L, 3.0L, 3.2L or 3.6L engine |
• | Oil Pressure Diagnosis and Testing for the 4.8L, 5.3L, and 6.0L engines. |
⇒ | If greater than the specified range, test the circuit for 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 tests 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 terminal 3 for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If the EOP indicator does not turn OFF, replace the IPC. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Engine Oil Pressure Sensor and/or Switch Replacement for 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L engines |
• | Engine Oil Pressure Sensor and/or Switch Replacement for 3.6L engine |
• | Control Module References for ECM replacement, setup and programming |