DTC C1204-02: Wheel Speed Sensor Front-RH Range/Performance/Intermittent: General Description

The wheel speed sensor is the essential component the ABS ECU (Integrated Brake Actuation Unit/IBAU) uses to calculate vehicle speed and to determine whether wheel lock occurs.

For example, front wheel speed signal is used as a reference value, for vehicle speed, in rear wheel drive vehicles, and if a difference between front and rear wheel speed occurs, then ABS control is performed.

Wheel speed sensor is active hall-sensor type.