Xterra SE 2WD V6-3.3L (VG33E) (2002)
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.