- Flow of Diagnosis - Start Here

Flow Chart:

1. Verify that the problem exists and verify whether the problem is a intermittent or a constant problem. DO NOT use the A-CHARTS or TROUBLE CODE CHARTS for diagnosing intermittent problems. For further information use DRIVEABILITY WORKSHEET AND VEHICLE REPAIR HISTORY forms below.

2. Check to make sure vacuum and vapor hose routing is correct and that hoses are not split or cracked.
a. Check to make sure all the electrical connections to sensors and solenoids are clean and have tight connections.
b. Check to make sure all engine grounds are clean and have good connections.

3. Check for updated diagnostic procedures, warranty or recall information.

4. See PROM ID under COMPUTERIZED ENGINE CONTROLS.

5. This checks the "On Car Diagnostics" and gives the proper sequence of testing. Refer to TESTING PROCEDURES/HOW TO ENTER DIAGNOSTIC MODE for procedure to enter diagnostics. If there are stored codes this will lead to the proper test.

NOTE: The charts under DIAGNOSTIC CHARTS are driveability and component testing charts. The computer communication/display diagnostic charts are in TESTING PROCEDURES under SELF-DIAGNOSTIC SYSTEM.

Driveability Worksheet.:

Driveability Worksheet.:

DRIVEABILITY WORKSHEET

Vehicle Repair History.:

Vehicle Repair History.:

VEHICLE REPAIR HISTORY