Speed Sensors

Front Speed Sensor:

Rear Speed Sensor:

The sensors sends wheel speed information to the ABS computer where the speed signals are used to determine when anti-lock control is required. Each wheel speed sensor consists of a magnet surrounded by a coil of wire. Mounted next to each front sensor is a sensor rotor that rotates along with the front brake disc. The rear speed sensor is mounted in the transmission tailhousing where it senses rear wheel speed from the reverse idler gear (manual transmission) or a special gear on the output shaft (automatic transmission).
As each tooth passes the sensor, the magnetic field in the wheel sensor is strengthened momentarily. This field strength change, repeated as each tooth passes the sensor, induces voltage in the wheel speed sensor coil and coaxial cable. The ABS computer compares the frequency of the AC signals from the wheel speed sensors to detect rapid wheel deceleration, indicating possible wheel locking.


NOTE: Always route these cables in exactly the same position as original manufacture. Electronic noise from improper cable routing can cause improper signals to be sent to the ECU.