P1521

P1521-INCORRECT ENGINE OIL TYPE

- When Monitored:
Engine Running.

- Set Condition:
Using the oil pressure, oil temperature and other vital engine inputs the Powertrain Control Module (PCM) can determine the engine oil viscosity. Incorrect viscosity will effect the operation of the VTC by delaying activation.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

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.

1. Ignition on, engine off.
2. With the scan tool, select View DTCs.

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.

1. 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.