P1521

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.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.


Diagnostic Test


1. ACTIVE DTC
NOTE: Review the customers oil change history. Ensure 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.

Ignition on, engine off.
With the scan tool, read DTCs.
Is the DTC active at this time?

Yes


- Go to 2


No


- Test Complete.




2. ENGINE OIL
NOTE: If set along with P1521, repair any engine oil pressure or temperature DTCs first before continuing.

The following conditions must be checked.
- 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 conditions found?

Yes


- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test


No


- Change the engine oil using the correct oil viscosity.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test