- Flow of Diagnosis - Start Here

Flow Of Diagnosis:

1. Verify that the problem exist and verify whether the problem is a intermittent or a constant problem. DO NOT use the A-CHARTS or TROUBLE CODE CHARTS for diagnosing of intermittent problems.
NOTE: For further information, use the DRIVEABILITY WORKSHEET and the VEHICLE REPAIR HISTORY forms under INFO TYPE MENU / TECHNICAL MANAGEMENT SUPPORT / SERVICE CONSULTANT under the main menu..


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


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


4. Perform the DIAGNOSTIC CIRCUIT CHECK under TESTING PROCEDURES. This checks to make sure that the computer is functioning properly and that the "SERVICE ENGINE SOON LIGHT" is working. This is the starting point for the diagnosis of the problem, and this circuit check will direct you to the proper test procedure.