- Important Preliminary Checks
Perform the Powertrain On-Board Diagnostic (OBD) 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.
^ Verify the customer complaint and locate the correct symptom in the table of contents. Perform the procedure included in the symptom chart.