| Item name | Spare part catalog number | Description |
| 1 | - | Wheel knuckle assembly |
| 2 | - | Sensor ring |
| 3 | - | Half shaft |
| 4 | - | Wheel speed sensor |
| 5 | - | Screw |
An active wheel speed sensor is installed on the hub of each wheel, transmitting information to the ABS module. (anti-lock braking system) signal of the rotational speed of each working wheel. The head of each sensor is located near the sensor ring with 48 teeth on the outer diameter of the universal joint of constant angular velocities. Each sensor is connected to the vehicle wiring by flying leads.
Each wheel speed sensor is connected to the ABS module. (anti-lock braking system) power supply circuit and signal circuit. When the ignition key is in position II, the ABS module (anti-lock braking system) supplies power to the wheel speed sensors and monitors their signals. As the axle shaft rotates, the sensor signal current changes; based on these changes, the ABS module (anti-lock braking system) the wheel speed and overall vehicle speed are calculated.
ABS module (anti-lock braking system) transmits information about the speed of individual wheels and the speed of the vehicle via a high-speed CAN bus (controller network) for use by other systems. Also via high-speed CAN bus (controller network) the quality factor of the vehicle speed signal is transmitted. If all wheel speed signals are available for calculating the vehicle speed, the quality factor of the vehicle speed signal is "data calculated with the specified accuracy". If one or more wheel speed sensors are faulty, the quality factor "accuracy does not match the specified accuracy" is used.
ABS module (anti-lock braking system) monitors the wheel speed sensor circuits for faults. If a fault is detected, the ABS module (anti-lock braking system) stores the corresponding fault code and turns on the corresponding warning lights, depending on the systems whose operation is disrupted (DSC/ETC, ABS, EBA/EBD, HDC). A warning chime sounds and on vehicles with a high-level instrument cluster, a message is displayed in the message center display. For more information, refer to the Information and Message Center (413-08)
[The article was copied from this resource: LRman.ru]
Since the wheel speed sensors are active devices, the signal from them is received even when the wheels are not rotating, which allows the ABS module (anti-lock braking system) check the sensors on a stationary vehicle. In addition, the direction of rotation of each wheel is determined. This information is transmitted via a high-speed CAN bus (controller network) for use by other systems.
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