P0523
P0523-ENGINE OIL PRESSURE SENSOR CIRCUIT HIGH
For a complete wiring diagram, refer to the Wiring Information.
- When Monitored:
With the ignition on. Battery voltage greater than 10.0 Volts.
- Set Condition:
The Engine Oil Pressure Signal circuit voltage is greater than the calibrated amount. One Trip Fault.
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.
1. ACTIVE DTC
NOTE: Review oil change history to ensure that the oil is being changed at the correct intervals and that the proper oil viscosity is being used.
1. Verify engine oil level.
2. Start the engine and allow it to reach normal operating temperature.
WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in possible serious or fatal injury.
3. With the scan tool, select View DTCs.
Is the DTC Active at this time?
Yes
- Go To 2
No
- Perform the INTERMITTENT CONDITION diagnostic procedure. Intermittent Condition Test
2. (G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Ignition on, engine not running.
4. Measure the voltage on the (G6) Engine Oil Pressure Signal circuit in the PCM C2 harness connector.
Is there any voltage present?
Yes
- Repair the short to voltage in the (G6) Engine Oil Pressure Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.
No
- Go To 3
3. (G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT OPEN
1. Turn the ignition off.
2. Disconnect the Engine Oil Pressure Sensor harness connector.
3. Measure the resistance of the (G6) Engine Oil Pressure Signal circuit from the Engine Oil Pressure Sensor harness connector to the PCM C2 harness connector.
Is the resistance below 5.0 Ohms?
Yes
- Go To 4
No
- Repair the open in the (G6) Engine Oil Pressure Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.
4. (K900) SENSOR GROUND CIRCUIT OPEN
1. Measure the resistance of the (K900) Sensor Ground circuit from the Engine Oil Pressure Sensor harness connector to the PCM C2 harness connector.
Is the resistance below 5.0 Ohms?
Yes
- Go To 5
No
- Repair the open in the (K900) Sensor Ground circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.
5. (G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K855) 5-VOLT SUPPLY CIRCUIT
1. Measure the resistance between the (G6) Engine Oil Pressure Signal circuit and the (K855) 5-Volt Supply circuit in the Engine Oil Pressure Sensor harness connector.
Is the resistance below 100 Ohms?
Yes
- Repair the short between the (K855) 5-Volt Supply circuit and the (G6) Engine Oil Pressure Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.
No
- Go To 6
6. ENGINE OIL PRESSURE SENSOR
1. Reconnect the PCM C2 harness connector.
2. Ignition on, engine not running.
3. With the scan tool, monitor the Engine Oil Pressure Sensor voltage.
4. Connect a jumper wire between the (G6) Engine Oil Pressure Signal circuit and the (K900) Sensor Ground circuit in the Engine Oil Pressure Sensor harness connector.
Is the voltage below 0.5 Volt with the jumper wire installed?
Yes
- Verify that there is good pin to terminal contact in the Sensor and Powertrain Control Module connectors. Replace the Engine Oil Pressure Sensor if no problems were found in the connectors. Oil Pressure Sensor - Removal
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.
No
- Go To 7
NOTE: Remove the jumper wire before continuing.
7. POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Engine Oil Pressure Sensor and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Sensor and Powertrain Control Module connectors.
4. Perform any Technical Service Bulletins that may apply.
Were there any problems found?
Yes
- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.
No
- Replace and program the Powertrain Control Module. PCM/ECM Reprogramming
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.