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.
- Turn ignition on, with engine off. With a scan tool, command the fuel pump relay ON and OFF. Does the fuel pump relay turn ON and OFF with each command? If yes, go to next step. If no, go to step 4.
- Observe the Freeze Frame/Failure Records data for this DTC. Turn ignition off for 30 seconds. Operate the vehicle within the Conditions for Running the DTC or as close as possible to the Freeze Frame/Failure records data that you observed. See CONDITIONS FOR RUNNING DTC . Does the DTC fail this ignition? If yes, go to next step. If no, go to INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM.
- Turn ignition off. Disconnect the fuel pump relay. Turn ignition on, with engine off. Probe the control circuit of the fuel pump relay harness connector with a test light connected to a good ground. With a scan tool, command the fuel pump relay ON and OFF. Does the test light turn ON and OFF with each command? If yes, go to next step. If no, go to step 6.
- Connect a test light between the control circuit of the fuel pump relay and the ground circuit of the relay. With a scan tool, command the fuel pump relay ON and OFF. Does the test light turn ON and OFF with each command? If yes, go to step 9. If no, go to step 11.
- Does the test light remain illuminated with each command? If yes, go to step 8. If no, go to next step.
- Test the control circuit of the fuel pump relay for a short to ground or an open. Did you find and correct the condition? If yes, go to step 14. If no, go to step 10.
- Test the control circuit of the fuel pump relay for a short to voltage. Did you find and correct the condition? If yes, go to step 14. If no, go to step 10.
- Inspect for poor connections at the fuel pump relay. Did you find and correct the condition? If yes, go to step 14. If no, go to step 12.
- Inspect for poor connections at the harness connectors of the PCM. Did you find and correct the condition? If yes, go to step 14. If no, go to step 13.
- Repair the ground circuit of the relay. After repairs, go to step 14.
- Replace the fuel pump relay. After repairs, go to step 14.
- Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE under PROGRAMMING. After replacing PCM, go to next step.
- Use the scan tool in order to clear the DTCs. Turn ignition off for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . Does the DTC run and pass? If yes, go to next step. If no, go to step 2.
- Turn ignition on, with engine off. Using scan tool, observe the stored information and Capture Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, 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.