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.
- Clear the DTCs with a scan tool. Idle the engine at the normal operating temperature. Monitor the misfire current counters with a scan tool. Are any of the misfire current counters incrementing? If yes, go to step 4. If no, go to next step.
- Observe the Freeze Frame/Failure Records for this DTC. Turn ignition off for 30 seconds. Start engine. Operate the vehicle within the Conditions for Running DTC or within the observed parameters of 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 DIAGNOSTIC AIDS .
- Turn ignition off. Disconnect the fuel injector harness multi-way connector. Jumper the 3 CMP sensor circuits between the fuel injector harness multi-way connections. Probe the appropriate fuel injector control circuit, PCM side, with a test light connected to battery voltage. Crank engine. Does the test light blink when cranking the engine? If yes, go to step 8. If no, go to next step.
- Does the test light remain illuminated at all times? If yes, go to step 7. If no, go to next step.
- Test the control circuit of the fuel injector for a short to voltage or an open between the multi-way connector and the PCM. Did you find and correct the condition? If yes, go to step 18. If no, go to step 14.
- Test the control circuit of the fuel injector for a short to ground between the multi-way connector and the PCM. Did you find and correct the condition? If yes, go to step 18. If no, go to step 17.
- Inspect the accessible fuel injector jumper harness between the multi-way connector and the plenum for the following conditions:
- Poor connections at the multi-way connector.
- Damaged or pinched wiring.
- Broken wires inside the insulation.
Did you find and correct the condition? If yes, go to step 18. If no, go to next step.
- Remove the upper intake. Probe the appropriate fuel injector control circuit, fuel injector side, at the multi-way connector, with a test light connected to battery voltage. Does the test light illuminate? If yes, go to step 15. If no, go to next step.
- With a DVOM, test for continuity between the ignition voltage terminal and the appropriate fuel injector control circuit terminal, at the multi-way connector. Does the DVOM indicate OL? If yes, go to next step. If no, go to step 13.
- Test the control circuit of the fuel injector for an open, or poor connections at the fuel injector. Did you find and correct the condition? If yes, go to step 18. If no, go to next step.
- Test the ignition voltage circuit of the fuel injector for an open between the fuel injector and the splice. Did you find and correct the condition? If yes, go to step 18. If no, go to step 16.
- Test the control circuit of the fuel injector for a short to voltage, or a short to another circuit. Did you find and correct the condition? If yes, go to step 18. If no, go to step 16.
- Inspect for poor connections at the harness connector of the PCM. Did you find and correct the condition? If yes, go to step 18. If no, go to step 17.
- Repair the short to ground in the fuel injector control circuit. After repairs, go to step 18.
- Replace the appropriate fuel injector. See REMOVAL & INSTALLATION - AZTEC & RENDEZVOUS article. After repairs, go to step 18.
- 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 the 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.