Wheel Speed Sensors

Wheel speed sensor consists of a permanent magnet, coil and wheel pulser (trigger wheel). Wheel speed sensors detect wheel rotational speed. As wheel pulser rotates, magnetic field around coil in each wheel speed sensor fluctuates, generating voltage frequency proportional to wheel rotational speed. These pulses are sent to ABS control unit to determine wheel speed. Wheel speed data from ABS control unit is sent to TCS control unit which determines amount of engine control.