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.
Circuit/System Testing
2010 Buick Lucerne CXL, 3.9 MSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2010 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If equipped, the following tests can be performed at an inline connector. See schematics for the corresponding terminals to test at.
- Ignition OFF, disconnect the harness connector at the fuel level sensor.
- Ignition ON, verify that the scan tool Fuel Tank Level Remaining parameter display is less than 4 percent.
- If greater than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM.
- If all circuits test normal, test or replace the fuel level sensor.
RENDER: 1.0x
NO RELATED
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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.