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 System Check - Vehicle
2004 Oldsmobile Bravada AWDSECTION Diagnostic System Check - Vehicle
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- Before beginning vehicle diagnosis, the following preliminary inspections/tests must be performed:
- Ensure that the battery is fully charged. Refer to Battery Inspection/Test (Side Terminal Battery)Battery Inspection/Test (Top Post Terminal Battery) .
- Ensure that the battery cables are clean and tight.
- Inspect for any open fuses. Refer to Power Distribution Schematics and Electrical Center Identification Views .
- Ensure that the grounds are clean, tight, and in the correct location. Refer to Ground Distribution Schematics and Power and Grounding Component Views .
- Inspect the easily accessible systems or the visible system components for obvious damage or conditions that could cause the concern.
- Inspect for aftermarket devices that could affect the operation of the system. Refer to Checking Aftermarket Accessories .
- Search for applicable service bulletins.
- If the preceding inspections/tests resolve the concern, go to Diagnostic Repair Verification .
- Install a scan tool. Verify that the scan tool powers up.
- If the scan tool does not power up, refer to Scan Tool Does Not Power Up .
- Ignition ON, Engine OFF, verify communication with all of the control modules on the vehicle. Refer to Data Link References
for information on the modules you should expect to communicate.
- If the scan tool does not communicate with one or more of the expected control modules, refer to Data Link References .
- Access the Power Mode parameter on the scan tool. Verify the power mode parameter matches all the ignition switch positions. Refer to Power Mode Description and Operation
for information on the power mode states that correspond to each ignition switch position.
- If the power mode parameter does not match the ignition switch position for all ignition switch positions, refer to Power Mode Mismatch .
- Attempt to start the engine. Verify that the engine cranks.
- If the engine does not crank, refer to Symptoms - Engine Electrical .
- Attempt to start the engine. Verify the engine starts and idles.
- If the engine does not start and idle, refer to one of the following:
- Engine Cranks but Does Not Run for the 2.2L (L61) engine
- Engine Cranks but Does Not Run for the 2.4L engine
- Engine Cranks but Does Not Run for the 3.5L (L66) engine
- If the engine does not start and idle, refer to one of the following:
IMPORTANT:
Open the drivers door to ensure retained accessory power mode (RAP) is inactive during this test. The engine may start during this test. Turn the engine OFF as soon as the crank power mode has been observed.
IMPORTANT:
Do not clear any DTCs unless instructed to do so by a diagnostic procedure.
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.