Important Preliminary Checks Before Starting
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Before using the Symptom tables use the following:
- Perform Diagnostic System Check - Engine Controls
and verify all of the following items:
- Ensure no DTCs are stored.
- The scan tool data is within normal operating range. Refer to Scan Tool Data List .
- Verify the customer complaint.
- Perform the Visual/Physical Check in this section.
Locate the correct symptom in the list at the end of this section. Follow the procedures in the appropriate diagnostic table. If the condition can not be duplicated or is determined to be intermittent, refer to Intermittent Conditions .