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.
Section 171 (Anti-Lock Brake System): Description
Anti-Lock Brake System (ABS) consists of hydraulic unit, actuator, solenoids, pump motor, ABS Electronic Control Unit (ECU), relays and wheel speed sensors. See Fig 1.
An ABS warning light is located in instrument cluster. ABS ECU performs a bulb test by illuminating ABS warning light for 3 seconds when ignition is turned on.
A primary check is performed after each engine start, and when initial vehicle speed exceeds 6 MPH. Under normal operation, an actuator noise is heard as vehicle is started or as speed exceeds 6 MPH. Anti-lock system remains active until vehicle speed drops to less than 3 MPH.
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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.