A Important Preliminary Checks

Perform the Computers and Control Systems Diagnostic Check before using the symptom tables. Refer to Diagnostic System Check - Computers and Control Systems. Verify all of the following are true:
^ The Powertrain Control Module (PCM) and Malfunction Indicator Lamp (MIL) Service Engine Soon are operating correctly.
^ There are no Diagnostic Trouble Codes (DTCs) stored.
^ The scan tool data is within the normal operating range, refer to Scan Tool Data List. Scan Tool Data, Normal Values and Definitions
^ Verify the customer concern and locate the correct symptom in the table of contents. Check the items indicated under that symptom.