P0520-ENGINE OIL PRESSURE SENSOR CIRCUIT

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
Ignition on, engine not running.
Set Condition:
The Powertrain Control Module (PCM) senses the oil pressure is out of the calibrated range. One Trip fault.

Possible Causes
(G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
RESISTANCE IN THE (G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT
(G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT
ENGINE OIL PRESSURE SENSOR
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)

NOTE: Make sure that the engine oil is at the proper level. Also, review the customers 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.	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 may result in possible serious or fatal injury.

2.	Using the scan tool, read the active DTCs.

Is the DTC Active at this time?

Yes

Go To 2

Perform the INTERMITTENT CONDITION diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

2. ENGINE OIL PRESSURE SENSOR

1.	Turn the ignition off.

2.	Ignition on, engine not running.

3.	With a scan tool, monitor the Engine Oil Pressure Sensor voltage.

4.	Connect a jumper wire between the (K900) Sensor Ground circuit and the (G6) Engine Oil Pressure Signal circuit.

NOTE: Engine Oil Pressure voltage should change from approximately 4.5 volts to less than 0.5 volt.

Is the voltage reading within the listed specification when the jumper wire is installed?

Yes

Verify that there is good pin to terminal contact in the Engine Oil Pressure Sensor and Powertrain Control Module connectors. If OK, replace the Engine Oil Pressure Sensor. (Refer to 09 - Engine/Lubrication/SENSOR, Oil Pressure - Removal) .
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

Go To 3

NOTE: Remove the jumper wire before continuing.

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

1.	Turn the ignition off.

2.	Disconnect the PCM C2 harness connectors.

3.	Disconnect the Engine Oil Pressure Sensor harness connector.

4.	Ignition on, engine not running.

5.	Measure the voltage on the (G6) Engine Oil Pressure Signal circuit in the Engine Oil Pressure Sensor 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. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

Go To 4

4. EXCESSIVE RESISTANCE IN THE (G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT

1.	Turn the ignition off.

2.	Disconnect the PCM C2 harness connectors.

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 connectors.

Is the resistance below 5.0 ohms?

Yes

Go To 5

Repair the excessive resistance in the (G6) Engine Oil Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

5. (G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND

1.	Measure the resistance between ground and the (G6) Engine Oil Pressure Signal circuit Engine Oil Pressure Sensor harness connector.

Is the resistance below 100 Ohms?

Yes

Repair the short to ground in the (G6) Engine Oil Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

Go To 6

6. EXCESSIVE RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT

1.	Measure the resistance of the (F855) 5-Volt Supply circuit from the Engine Oil Pressure Sensor harness connector to the PCM C2 harness connectors.

Is the resistance below 5.0 Ohms?

Yes

Go To 7

Repair the excessive resistance in the (F855) 5-Volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

7. (F855) 5-VOLT SUPPLY SHORTED TO GROUND

1.	Measure the resistance between ground and the (F855) 5-Volt Supply circuit in the Engine Oil Pressure Sensor harness connector.

Is the resistance below 100 Ohms?

Yes

Repair the short to ground in the (F855) 5-Volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

Go To 8

8. EXCESSIVE RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT

1.	Measure the resistance of the (K900) Sensor Ground circuit from the Engine Oil Pressure Sensor harness connector to the PCM C2 harness connectors.

Is the resistance below 5.0 Ohms?

Yes

Go To 9

Repair the excessive resistance in the (K900) Sensor Ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

9. 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 Engine Oil Pressure 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. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

Replace and program the Powertrain Control Module in accordance with the service information. (Refer to 08 - Electrical/8E - Electronic Control Modules/MODULE, Powertrain Control - Removal) .
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

P0520-ENGINE OIL PRESSURE SENSOR CIRCUIT

P0520-ENGINE OIL PRESSURE SENSOR CIRCUIT

Possible Causes