- Checking the Basics

Before using this section you should have performed the "On-board Diagnostic System Check".
1. The PCM and MIL (Service Engine Soon) are operating correctly.
2. There are no diagnostic trouble codes stored, or there is a diagnostic trouble code but no MIL (Service Engine Soon).

Verify the customer complaint and locate the correct symptom chart. Check the items indicated in the chart.

VISUAL/PHYSICAL CHECK

Several of the symptom procedures call for a Careful Visual/Physical Check. The importance of this step cannot be stressed too strongly - it can lead to correcting a problem without further checks and can save valuable time. This check should include:
^ PCM grounds and sensors for being clean, tight and in their proper location.
^ Vacuum hoses for splits, kinks, and proper connections, as shown on "Vehicle Emission Control Information" label. Check thoroughly for any type of leak or restriction.
^ Air leaks at throttle body mounting area and intake manifold sealing surfaces.
^ Ignition wires for cracking, hardness, proper routing and carbon tracking.
^ Wiring for proper connections, pinches and cuts.