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 2003 Pontiac Aztek and 2003 Buick Rendezvous. 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 for this DTC. Turn ignition off for 30 seconds. Start engine. Operate vehicle within the Conditions for Running DTC or within the parameters observed in the Freeze Frame/Failure Records. See CONDITIONS FOR RUNNING DTC . Does the DTC fail this ignition cycle? If yes, go to next step. If no, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 3.4L AZTEK & RENDEZVOUS article.
- Turn ignition off. Disconnect the EGR valve. Turn ignition on, with engine off. Command the EGR solenoid to 100 percent with a scan tool. Measure the voltage from the 5-volt reference circuit to a good ground with a DVOM. Is the voltage 4.8-5.2 volts? If yes, go to step 5. If no, go to next step.
- Is the voltage measured more than 5.2 volts? If yes, go to step 8. If no, go to step 6.
- Connect the EGR valve. Disconnect the MAP sensor. Command the EGR solenoid to 100 percent with a scan tool. Measure the voltage from the 5-volt reference circuit of the MAP sensor to a good ground with a DVOM. Is the voltage within 4.8-5.2 volts? If yes, see DIAGNOSTIC AIDS . If no, go to step 11.
- Monitor a DVOM while disconnecting all other devices connected to the 5-volt reference circuit, one at a time. If voltage changes when one of the devices are disconnected, replace the affected component (MAP, FTP, TP and TP sensors). Was a component replaced? If yes, go to step 13. If no, go to next step.
- Turn ignition off. Disconnect the PCM. Test the 5-volt reference circuit for a short to ground or any sensor low reference circuit. Did you find and correct the condition? If yes, go to step 13. If no, go to step 12.
- Monitor the DVOM while disconnecting the MAP sensor and FTP sensor, one at a time. If voltage returns to within 4.8-5.2 volts when one of the devices is disconnected, test that sensors signal circuit for a short to voltage. If yes, go to step 13. If no, go to next step.
- Test the 5-volt reference circuits for a short to voltage. Did you find and correct the condition? If yes, go to step 13. If no, go to next step.
- Test for a short between the EGR 5-volt reference circuit and the EGR solenoid high control circuit. Did you find and correct the condition? If yes, go to step 13. If no, go to step 12.
- Replace EGR valve. See REMOVAL & INSTALLATION - AZTEC & RENDEZVOUS article. After repairs, go to step 13.
- Replace PCM. See REMOVAL & INSTALLATION - AZTEC & RENDEZVOUS article. Reprogram PCM. See POWERTRAIN CONTROL MODULE under PROGRAMMING. After repairs, go to next step.
- Clear the DTCs with a scan tool. Turn ignition off for 30 seconds. Start engine. Operate vehicle within the Conditions for Running DTC. See CONDITIONS FOR RUNNING DTC . 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.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.