Front Wheel Speed Sensor: Description
The Mark 20e system uses two-wire wheel speed sensors, known as active wheel speed sensors. The sensors use an electronic principle known as magnetoresistive to help increase performance and durability. The sensors convert wheel speed into a small digital signal. A wheel speed sensor is used at each wheel. The gear (tooth) type tone wheel serves as the trigger mechanism for each sensor. At each wheel of the vehicle there is one wheel speed sensor and one tone wheel.
The front wheel speed sensor (WSS) is attached to the inside of the steering knuckle (Fig 1 ). The front tone wheel is mounted through the knuckle to the rear of the hub and bearing assembly.
WSS air gaps are not adjustable. The initial factory WSS air gap specification can be found in SPECIFICATIONS. Each front WSS is serviced individually as is each front tone wheel.