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10-7 4890-00 4WD - Front/Rear wheel speed sensor 2WD - Front wheel speed sensor 2WD - Rear wheel speed sensor ECU (Electronic Control Unit) 1. ECU calculates the wheel speed, acceleration and deceleration with the information from wheel speed sensor, and determines the wheel slip to control the valve and motor. HU (Hydraulic Unit) 2. The hydraulic circuit contains the primary circuit and secondary circuit for ABS operation. This unit controls the hydraulic pressure to each wheel. If the system needs ABS operation, the valves in the unit operate to control HOLD, RISE and DUMP according to ECU control logic. Motor 3. The motor is operated when ABS is activated. The cam-shaped output shaft of the motor enables the brake system to receive and supply the brake fluid during the motor operation. Wheel speed sensor ▶ Wheel speed sensor sends the data detected by tone wheel to HECU. HECU ▶ Rear wheel speed sensor in 2WD vehicle is different from that in 4WD vehicle. Location of rear tone wheel (A) and wheel sensor (B) in 2WD vehicle |