Important Preliminary Checks
Before Starting
Before using this section, perform the
Diagnostic System Check - Vehicle
and determined that the following items are OK:
| • | The control module, malfunction indicator lamp (MIL), and check engine are operating correctly. |
| • | There are no DTCs stored. |
Verify the customer complaint, and locate the correct symptom in the table of contents. Inspect 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 strongly enough. This step can lead to correcting a condition without further inspections and can save valuable time. This inspection
should include:
| • | Control module grounds for the following conditions: |
| • | Vacuum hoses for the following conditions: |
| • | Air leaks at the following components: |
| - | Intake manifold sealing surfaces |
| • | Wiring for the following conditions: |
| • | Use the following tables when diagnosing a symptom complaint: |
