Located on the transmission case, within the rear differential assembly or inside the ABS system, the vehicle speed sensor reads the speed of the wheel rotation on a vehicle while driving. The sensor also helps the vehicle maintain stability while driving by telling the computer when to release pressure to a wheel while using the ABS. A type of tachometer, the part consists of a toothed ring and pickup. The speed sensor reads the rotational speed of the reluctor wheel, located within the transmission. Speed sensors within the differential use a trigger wheel mounted in conjunction with the ring gear to accomplish the same tasks as those performed by the transmission-mounted version.
When replacing the vehicle speed sensor, the mechanic will first run a diagnostic to make sure that the problem does not lie with the transmission instead. Replace a faulty speed sensor as soon as possible to avoid further damages on your vehicle. The speed sensor also controls the anti-lock braking system. Driving with a bad speed sensor usually causes the ABS to malfunction and can lead to loss of braking power and/or an accident. The speed sensor likewise affects the transmission, causing it to perform erratically.
While vehicle owners can get away with not replacing a vehicle speed sensor initially, they can expect the vehicle’s usability to only worsen over time. Owners want to refrain from waiting until the part goes out completely, which could cause critical vehicle systems, such as the speedometer and anti-lock brakes, to stop functioning entirely.
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