Diagnostic Notes

Use this section to find the correct test procedure for a given symptom. The symptoms and actions in this section are Emission related only. Refer to Computers and Control Systems, Fuel Supply and Air Induction, or Ignition System for complete Diagnosis By Symptom for those systems.

FLOW OF DIAGNOSIS
Always use the Flow of Diagnosis for proper testing sequence. Verify the correct system application to ensure that the vehicle has the given component(s).

VISUAL INSPECTION
Before proceding to the appropriate symptom perform the following inspection:

1. Vacuum hoses for splits, kinks and proper routing.
2. Ignition wires for cracking, hardness and proper connections at both the distributor and spark plugs.
3. All wiring for proper connections, pinches, routing, and cuts.

NOTE: Except when attempting to diagnose a cold driveability problem, it is essential that the vehicle be properly warmed up to operating temperature. The vehicle should be driven for 10 to 20 minutes, to ensure that all systems are functioning during diagnosis. If this is not achieved, the catalytic converter and feedback systems will not function as designed. Resulting in inaccurate tests.