P1521–INCORRECT ENGINE OIL TYPE


  • When Monitored:

    Engine Running.

  • Set Condition:

    Using the oil pressure, oil temperature and other vital engine inputs the PCM can determine the engine oil viscosity. Incorrect viscosity will effect the operation of the MDS by delaying cylinder activation .


Possible Causes
  
INCORRECT ENGINE OIL TYPE
  
ENGINE OIL CONTAMINATION
  
ENGINE OIL
  

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



Diagnostic Test

1.ACTIVE DTC

NOTE: Review the customers oil change history. Make sure the customers is using the correct engine oil viscosity. If the incorrect oil is being used, change the oil, using the correct engine oil viscosity.





Is the DTC Active at this time?

Yes
  • Go to 2


No
  • Test Complete.

2.ENGINE OIL

NOTE: If any engine oil pressure or oil temperature DTCs set along with P1521, repair them before continuing with the P1521 diagnostics.


  • OEM recommended oil viscosity is being used.
  • Customer is following the oil change schedule.
  • Check the engine oil for contamination. (i.e., fuel and/or engine coolant)
  • Internal engine condition that may effect oil pressure.


Were any of the above condition found?

Yes


No