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 ON the ignition switch. Select chassis application on the scan tool. Attempt to display Anti-Lock Brake System (ABS) data on the scan tool. Can ABS data be displayed? If yes, go to next step. If no, go to step 4.
- Test the serial data circuit for an open or a poor connection between the PCM and the EBCM. Did you find and correct the condition? If yes, system okay. If no, problem is intermittent. Refer to INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM.
- Turn ignition off switch. Disconnect the EBCM. Turn ON the ignition switch. Using a Digital Multimeter (DMM) measure voltage on the serial data circuit at the EBCM harness connector. Does voltage vary between 1-5 volts? If yes, go to next step. If no, go to step 6.
- Inspect for a poor connection at the EBCM. Did you find and correct the condition? If yes, go to step 7. If no, go to next step.
- Test for an open in the serial data circuit to the EBCM. Did you find and correct the condition? If yes, go to next step. If no, diagnose anti-lock brake systems. See appropriate ANTI-LOCK article in BRAKES.
- Turn ON the ignition switch. Select chassis application on the scan tool. Attempt to display ABS data on the scan tool. Can ABS data be displayed? If yes, system is okay. If no, go to step 4.
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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.