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 Pontiac Grand Am, 2002 Oldsmobile Alero, 2002 Chevrolet Monte Carlo, and 2002 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
- Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
- Does the scan tool indicate DTCs P0443, P0449, P0452, or P0453 are also set? If yes, diagnose affected DTC(s). See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
- Inspect the EVAP system for a loose, missing, or damaged service port Schrader valve. Check for loose, incorrect, missing or damaged fuel fill cap. Check for damaged EVAP canister purge valve. Raise vehicle on a hoist. Inspect EVAP system for disconnected, improperly routed, kinked, or damaged EVAP pipes and hoses, damaged EVAP canister vent valve or EVAP canister. Did you find and correct the condition? If yes, go to step 5. If no, go to next step.
- With a scan tool, capture and record the Fail Record data and clear the DTCs. Perform the Service Bay Test. Does the scan tool indicate that the Service Bay Test passed? If yes, see DIAGNOSTIC AIDS . If no, go to next step.
- Install the J-41415-40 Fuel Fill Cap Adaptor. Connect the J-41413 EVAP Pressure and Purge Station and the vehicle fuel fill cap to the J-41415-40. Turn ignition on, with engine off. Seal the EVAP system with the scan tool. Continuously pressurize the EVAP system to 15 in. H2O with the J-41413 (fuel tank may need to be partially lowered to inspect components located in upper portion of tank). Using an Ultrasonic Leak Detector, check for leaks in EVAP system purge pipe, vapor pipe, vent hose, fuel fill pipe/hose and fuel fill cap. Check for leaks in the fuel pump assembly and/or seal, FTP sensor seal, fill limiter vent valve, pressure relief valve, rollover valves, permanent EVAP pipes and/or fuel tank. Did you find and correct the condition? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
- With a scan tool, capture and record the Fail Record data and clear the DTCs. Perform the Service Bay Test. Does the scan tool indicate that the Service Bay Test passed? If yes, go to next step. If no, repeat step 5.
- With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
NOTE:
Always zero the EVAP pressure and vacuum (in. H2O) gauges on EVAP Pressure and Purge Station before proceeding with diagnosis.
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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.