Wheel Speed Sensor: Description and Operation

WHEEL SENSOR





The sensor units consist of a gear-shaped sensor rotor and a sensor element. The front sensors are installed on the back of the front brake rotors. For 2-wheel drive systems a single sensor is installed at the companion flange of the rear axle housing and for 4-wheel drive systems there is a sensor installed at each rear brake drum. As the wheel rotates, the sensor generates a square-wave pattern. The frequency increases as the rotating speed increases.