P0523-ENGINE OIL PRESSURE SENSOR CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on. Battery voltage greater than 10 volts.
Set Condition:
The Engine Oil pressure signal is greater than the calibrated amount. One Trip Fault.

Possible Causes

(G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

(G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT OPEN

(G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT

(K900) SENSOR GROUND CIRCUIT OPEN

ENGINE OIL PRESSURE SENSOR

PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Diagnostic Test

1.ACTIVE DTC

NOTE: Make sure that the engine oil is at the proper level. Also, check the customers oil change history to make sure that the oil is being changed at the correct intervals and that the proper oil viscosity is being used.

Is the DTC Active at this time?

Yes

Go To 2

Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

2.ENGINE OIL PRESSURE SENSOR

Is the voltage below 0.5 of a volt with the jumper wire installed?

Yes

Replace the Engine Oil Pressure Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To 3
NOTE: Remove the jumper wire before continuing.

3.(G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

Is there any voltage present?

Yes

Repair the short to battery voltage in the (G6) Engine Oil Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To 4

4.(G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT OPEN

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Is the resistance below 5.0 ohms?

Yes

Go To 5

Repair the open in the (G6) Engine Oil Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

5.(G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT

Is the resistance below 100 ohms?

Yes

Repair the short between the (F855) 5-volt Supply circuit and the (G6) Engine Oil Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To 6

6.(K900) SENSOR GROUND CIRCUIT OPEN

Is the resistance below 5.0 ohms?

Yes

Go To 7

Repair the open in the (K900) Sensor Ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

7.PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Were there any problems found?

Yes

Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)