P0524-ENGINE OIL PRESSURE TOO LOW





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    Engine running.

  • Set Condition:

    The engine oil pressure never reaches the calibrated specification to allow the MDS activation. One trip fault.


Possible Causes
  
ENGINE OIL/ENGINE MECHANICAL
  
(G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
  
RESISTANCE (G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT
  
(G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
  
RESISTANCE IN (F855) 5-VOLT SUPPLY CIRCUIT
  
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
  
RESISTANCE IN THE (K900) SENSOR RETURN 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 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


No

2.ENGINE OIL/ENGINE MECHANICAL

NOTE: The following items must be considered before determining the cause of this DTC. Failure to do so may lead to misdiagnosis.

  • ENGINE MECHANICAL TOLERANCES OUT OF SPECIFICATION
  • ENGINE OIL PRESSURE OUT OF SPECIFICATION
  • LOW ENGINE OIL
  • OIL DIRTY OR DETERIORATED (Lack of scheduled oil changes)
  • CORRECT VISCOSITY
  • ENGINE OIL CONTAMINATED (i.e., coolant and/or fuel)




Were any of the above conditions present?

Yes


No
  • Go To 3

3.ENGINE OIL PRESSURE SENSOR








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
  • Remove the Engine Oil Pressure sensor and ensure the oil passage/port is free from any blockage. If OK, replace the Engine Oil Pressure Sensor.
  • Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)


No
  • Go To 4

  • NOTE: Remove the jumper wire before continuing.


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





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


No

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





Is the resistance below 100 ohms?

Yes


No
  • Go To 6

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





Is the resistance below 5.0 ohms?

Yes
  • Go To 7


No

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





Is the resistance below 100 ohms?

Yes


No
  • Go To 8

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





Is the resistance below 5.0 ohms?

Yes
  • Go To 9


No

9.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


No