2007 Commander XK Factory Service Manual 9 - ENGINE

P0520-ENGINE OIL PRESSURE SENSOR CIRCUIT





For a complete wiring diagram Refer to Section 8W.



Possible Causes
  
(G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY 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
  
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 ensure that the oil is being changed at the correct intervals and that the proper oil viscosity is being used.


Ignition on, engine not running.
With a scan tool, select View DTCs.

Is the DTC Active at this time?

Yes


No

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



Turn the ignition off.
Disconnect the C1 and C2 PCM harness connectors.
Disconnect the Engine Oil Pressure Sensor harness connector.
Ignition on, engine not running.
Measure the voltage on the (G6) Engine Oil Pressure Signal circuit in the Engine Oil Pressure Sensor harness connector.

Is the voltage above 0 volts?

Yes


No

3. ENGINE OIL PRESSURE SENSOR



Turn the ignition off.
Connect the PCM harness connectors.
Ignition on, engine not running.
With a scan tool, monitor the Engine Oil Pressure Sensor voltage.
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 of a volt.



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

Yes


No

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



Turn the ignition off.
Disconnect the C1 and C2 PCM harness connectors.

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.


Measure the resistance of the (G6) Engine Oil Pressure Signal circuit from the Engine Oil Pressure Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms for each circuit?

Yes


No

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



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


No

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



Measure the resistance of the (F855) 5-volt Supply circuit from the Engine Oil Pressure Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes


No

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



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


No

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



Measure the resistance of the (K900) Sensor Ground circuit from the Engine Oil Pressure Sensor harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes


No

9. PCM

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


Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes


No