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 AWDSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2002 GMC Savana and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
- Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM.
- Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start and idle the engine. Operate the vehicle within the Conditions for Running DTC. You may also operate the vehicle within the conditions that you observed from Freeze Frame/Failure Records. Does the DTC fail this ignition cycle? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
- Turn ON the ignition, with the engine OFF. Command the AIR relay ON and OFF with a scan tool. Does the AIR pump turn ON and OFF? If yes, see INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
- Turn OFF the ignition. Remove the battery. Remove the secondary Air Injection (AIR) relay. Connect the battery cables. Turn ON the ignition, with the engine OFF. Probe the coil side ignition 1 voltage circuit of the AIR relay at the fuse block with a test lamp connected to a good ground. Does the test lamp illuminate? If yes, go to next step. If no, go to step 11.
- Connect a test lamp between the control circuit of the AIR relay and the ignition 1 voltage circuit of the AIR relay at the fuse block. Command the AIR relay ON and OFF with a scan tool. Does the test lamp turn ON and OFF with each command? If yes, go to step 9. If no, go to next step.
- Does the test lamp remain illuminated with each command? If yes, go to step 8. If no, go to next step.
- Test the AIR control circuit of the AIR relay for a short to voltage or an open. Did you find and correct a condition? If yes, go to step 14. If no, go to step 10.
- Test the AIR control circuit of the AIR relay for a short to ground. Did you find and correct a condition? If yes, go to step 14. If no, go to step 10.
- Inspect the connections at the relay. If you find a poor connection, repair the terminal as necessary. Did you find and correct the condition? If yes, go to step 14. If no, go to step 12.
- Inspect the connections at the Powertrain Control Module (PCM). If you find a poor connection, repair the terminal as necessary. Did you find and correct the condition? If yes, go to step 14. If no, go to step 13.
- Repair the short to ground or open circuit in the ignition 1 voltage circuit. Replace the IGN E fuse as necessary. After repairs, go to step 14.
- Replace the relay. After repairs, go to step 14.
- Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE under PROGRAMMING. After repairs, go to next step.
- Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC as specified in the supporting text. Does the DTC run and pass? If yes, go to next step. If no, go to step 2.
- Observe the stored information, Capture Info with a scan tool. 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.