DRIVEABILITY Symptom Check Procedures

Symptom checks cannot be used properly unless the problem or driveability characteristic actually happens while the vehicle is being tested. To reduce diagnostic time, ensure steps in the BASIC TESTING and TESTS W/CODES articles have been performed before attempting to diagnose a symptom.

DIAGNOSTIC ROUTINES are indexed for your convenience. For the menu screen, the titles have been shortened to ROUTINE. This allows for more of the information to be displayed on the menu. They should be used to identify systems and components that should be checked to identify a fault. Perform the check or adjustment as indicated in the appropriate ROUTINE chart. a reference may be given to direct you to another test procedure or to a specific CIRCUIT TEST in the TESTS W/CODES article. This will provide additional information for checking a component or circuit.

On vehicles equipped with EEC-IV systems, charts are provided to direct the technician to CIRCUIT TESTS in the TESTS W/CODES article. This is the circuit or component most likely to be the cause of the applicable driveability symptom. These charts should only be used in conjunction with the DIAGNOSTIC ROUTINES.