Wheel Speed Sensor
WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Any time a wheel speed sensor is removed, thoroughly clean the mounting surfaces. Apply high-temperature grease to the front wheel speed sensors when installing.
The ABS uses three variable-reluctance sensors to determine vehicle speed. The wheel speed sensors operate on a magnetic induction principle. As the teeth on the wheel speed sensor indicator rotate past the stationary sensor, a signal proportional to the speed of the rotation is generated and sent to the ABS control module through a twisted cable.