Flow of Diagnosis

Flow Of Diagnosis:

1. Check any Technical Service Bulletins that may apply to the vehicle being serviced. These bulletins may contain important information regarding warranty, recalls, revised service procedures, etc.

2. One of the most important checks that must be performed as part of any diagnostic procedure is a careful visual inspection. This can often locate problem without further testing. Be sure to inspect all vacuum lines for correct routing, pinches or cuts, swollen or loose connections, etc. Check hoses that may be hidden under the air intake, A/C compressor, alternator or accessory brackets. Carefully check all electrical wiring for damage, bare or burned spots where wires may be in contact with sharp edges or hot exhaust manifolds, corroded or damaged connections, etc. Be sure all wires to ECM controlled devices or sensors are at least 100mm (4") away from ignition coil or spark plug wires.

3. The On-Board Diagnostics will verify that the ECM sensors and circuits are functioning properly, or display any trouble codes that may be stored in the computer memory.

4. This list of symptoms and their possible causes is used to aid in diagnosing intermittent problems or failures which do not store trouble codes in the computer memory.