Important Preliminary Inspections Before Starting
WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
Perform Diagnostic System Check - Engine Controls before using the symptom tables, and verify that all of the following are true:
- The powertrain control module (PCM) and malfunction indicator lamp (MIL) are operating correctly.
- There are no DTCs stored.
- The scan tool data is within the normal operating range, refer to Scan Tool Data List .
- Verify the customer concern and locate the correct symptom in the table of contents. Inspect the items indicated under that symptom.