P0520-OIL PRESS SENSOR CKT MALF SIGNAL VOLTAGE TOO HIGH

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the engine running.
Set Condition:
The Oil Pressure Sensor signal is above 4.8 volts for 0.5 second.

Possible Causes

ENGINE OIL PRESSURE SENSOR

BCM - OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

BCM - OIL PRESSURE SENSOR SIGNAL OPEN

OIL PRESSURE SENSOR SIGNAL CIRCUIT OPEN

OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

SENSOR GROUND CIRCUIT OPEN

INTERMITTENT CONDITION

Diagnostic Test

1.CHECK FOR CURRENT DTC

NOTE: If DTC P0641, P0651 or P0697 is present with this DTC, diagnose DTCs P0641, P0651 or P0697 before diagnosing this DTC.

NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.

NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

Did this DTC set again?

Yes

Go To2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2.CHECK OIL PRESSURE SENSOR SIGNAL CIRCUIT

Select the appropriate voltage reading.

Voltage is above 5.5 volts.

Go To3

Voltage is between 4.7 and 5.4 volts.

Go To4

Voltage is below 4.7 volts.

Go To5

3.OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

Is the voltage below 1.0 volt?

Yes

Replace and program the Front Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Repair the Oil Pressure Sensor Signal circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

4.SENSOR GROUND CIRCUIT OPEN

Is the resistance below 10.0 ohms?

Yes

Replace the Engine Oil Pressure Sensor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Repair the Sensor Ground circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

5.OIL PRESSURE SENSOR SIGNAL CIRCUIT OPEN

Is the resistance below 10.0 ohms?

Yes

Replace and program the Body Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Repair the Oil Pressure Sensor Signal circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).