Symptoms - Engine Controls for Pontiac Sunfire 2001
Important Preliminary Checks
Before Starting
Before using this section you should have performed the Engine Controls
Diagnostic System Check and determined that the following items are
OK:
| • | The powertrain control module (PCM) and malfunction indicator
lamp (MIL), 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
inspection. The importance of this step cannot be stressed strongly enough.
This step can lead to correcting a problem without further inspections
and can save valuable time. This inspection should include:
| • | PCM grounds for the following conditions: |
| • | Vacuum hoses for the following conditions: |
| - | Proper connections as shown on Vehicle Emission Control Information
label |
| • | Air leaks at the following components: |
| - | Intake manifold sealing surfaces |
| • | Wiring for the following conditions: |
| • | Use the following tables when diagnosing a symptom complaint: |
