Diagnostic Test
- CHECK FOR AN 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.
- Ignition on, engine off.
- With the scan tool, read DTCs.
Is the DTC active?
Yes
- Go To 2
No
- Test Complete.
- ENGINE OIL NOTE:
If any engine oil pressure or oil temperature DTCs set along with P1521, repair them before continuing with the P1521 diagnostics.
- 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. Refer to POWERTRAIN VERIFICATION TEST .
No
- Change the engine oil using the correct oil viscosity.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
- The following conditions must be checked.