Flow of Diagnosis - With Throttle Body Injection

Flow Of Diagnosis:

1. Verify that the problem exist and verify whether the problem is a intermittent or a constant problem. Use Driveability Worksheet and Vehicle Repair History forms below to get complete information from the customer.
DO NOT use the A-CHARTS or TROUBLE CODE CHARTS for diagnosing of intermittent problems.


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.

Driveability Worksheet.:

Driveability Worksheet.:

DRIVEABILITY WORKSHEET

Vehicle Repair History.:

Vehicle Repair History.:

VEHICLE REPAIR HISTORY