Rear 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 rear wheel speed sensors are mounted through the disc brake adapter. See Fig 1 and Fig 2 . The rear tone wheels are mounted to and rotate with the hub and bearing assemblies.
The WSS air gaps are not adjustable. The initial factory WSS air gap specification can be found in SPECIFICATIONS . Each WSS is serviced individually. The tone wheels are serviced as an assembly with the hub and bearing assemblies.