- Important Preliminary Checks

Before using Symptoms, perform the powertrain on-board Diagnostic System Check and verify all of the following items:

^ The PCM and Malfunction Indicator Lamp (MIL) (Service Engine Soon) are operating correctly.

^ There are no DTC(s) stored.

^ Scan tool data is within normal operating range, Refer to Typical Scan Data Values. Testing and Inspection

^ Verify the customer complaint, and after locating the correct symptom, perform the procedure included in the symptom chart.