Impreza 2.5 RS Coupe F4-2.5L SOHC (2000)
Wheel Speed Sensor: Description and Operation
ABS SENSOR
The Anti-lock Brake System (ABS) sensor detects wheel speed and consists of a permanent magnet, coil, tone wheel, etc. The magnetic flux produced
by the permanent magnet varies with the tone wheel (which rotates together with the wheel) and the sensor emits an alternating voltage corresponding
with the wheel speed by electromagnetic induction.