Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Procedures
2004 Oldsmobile Bravada RWDSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2002 GMC Sonoma and 2002 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- Did you perform the Inspection/Maintenance (I/M) System Check? If yes, go to next step. If no, go to INSPECTION/MAINTENANCE SYSTEM CHECK .
- Using a scan tool, select Special Functions. Determine if vehicle is equipped with a Service Bay Test for EVAP system. Is vehicle equipped with EVAP Service Bay Test? If yes, go to next step. If no, go to step 5.
- Ensure the vehicle is within the Conditions for Running DTC. See CONDITIONS FOR RUNNING DTC . Turn off all accessories (e.g., A/C, blower fan, etc.). Using scan tool, perform EVAP Service Bay Test. Did the EVAP System pass the Service Bay Test? If yes, go to step 8. If no, go to next step.
- Observe scan tool service bay test for indication of why the test did not pass (e.g., failed DTC, test aborted, etc.). Repair as necessary. After repairs, go to INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE .WARNING: Road test vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.
- Turn off all accessories (e.g., A/C, blower fan, etc.). Once engine is started, DO NOT turn engine off for the remainder of the procedure or until test is complete. Start and operate engine at idle.
- Accelerate vehicle at part throttle to 45 MPH and maintain speed until engine reaches normal operating temperature.
- Continue for an additional 3 minutes after engine reaches normal operating temperature, or until I/M System Status indicator updates to YES.
- Using scan tool, observe DTC Information. Does scan tool indicate any failed DTCs? If yes, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.NOTE: Refer to INSPECTION/MAINTENANCE SYSTEM DTCS to determine which DTCs are required to run in order to complete this test.
- Using scan tool, observe the NOT RAN SINCE CODE CLEARED display. Determine which of the DTCs required for a YES status has not run. Enter DTC number in the Specific DTC menu of scan tool. Operate vehicle within the conditions for running the DTC. CONDITIONS FOR RUNNING DTC . Repeat procedure until scan tool indicates the diagnostic test has run. Repeat step 4 for any additional required DTCs that have not run. Using scan tool, observe I/M System Status display. Did EVAP system status update to YES? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
- Using scan tool, observe the emission related DTC portion of I/M System Status display. If scan tool indicates any emission related DTCs set, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are displayed, system is okay.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.