Preliminary Checks

Before Starting
Before using the B Chart section you should have performed the On-Board Diagnostic System check and determined that:

1. The Engine Control Module and Malfunction Indicator Lamp are operating correctly.
2. There are no Diagnostic Trouble Codes stored, or there is a Diagnostic Trouble Code but no Malfunction Indicator Lamp.

Symptoms
Verify the customer complaint, and locate the correct symptom. Check the items indicated under that symptom.

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:
- Engine Control Module grounds 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.
- Fuel Lines for being pinched or misrouted.

NOTE: 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