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.
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HOMESERVICE MANUALSBUICK1994ROADMASTER ESTATE WAGON V8-350 5.7LREPAIR AND DIAGNOSISBRAKES AND TRACTION CONTROLANTILOCK BRAKES / TRACTION CONTROL SYSTEMSTESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEWVEHICLE ON-BOARD DIAGNOSTICS
1994 Buick Roadmaster Estate Wagon V8-350 5.7L
Vehicle on-Board Diagnostics
1994 Buick Roadmaster Estate Wagon V8-350 5.7LSECTION Vehicle on-Board Diagnostics
Due to the sensitivity of ABS components to electromagnetic interference, the following checks should be performed is an intermittent malfunction is suspected:
1. Check for proper installation of wiring harnesses resulting from add on options.
2. Visually inspect wheel speed sensor and toothed sensor ring for looseness, damage, accumulation of foreign material and proper mounting. Replace damaged components, remove any foreign material and properly attach all components.
3. Check front wheel speed sensor wiring for proper routing away from spark plug wires.
4. Using tool No. J-39200 DMM, or equivalent, measure resistance of spark plug wires. If "OL" (infinite) or a resistance greater than 30,000 ohms for any wire, replace spark plug wires.
5. While test driving vehicle, monitor Tech 1 wheel speeds. If any wheel speed drops or displays an erratic speed, refer to appropriated wheel speed sensor DTC.
1. Check for proper installation of wiring harnesses resulting from add on options.
2. Visually inspect wheel speed sensor and toothed sensor ring for looseness, damage, accumulation of foreign material and proper mounting. Replace damaged components, remove any foreign material and properly attach all components.
3. Check front wheel speed sensor wiring for proper routing away from spark plug wires.
4. Using tool No. J-39200 DMM, or equivalent, measure resistance of spark plug wires. If "OL" (infinite) or a resistance greater than 30,000 ohms for any wire, replace spark plug wires.
5. While test driving vehicle, monitor Tech 1 wheel speeds. If any wheel speed drops or displays an erratic speed, refer to appropriated wheel speed sensor DTC.
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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.