Electronic Hydraulic Control Unit (EHCU)

The EHCU consists of ABS control circuits, fault detector, and a fail-safe. It drives the hydraulic unit according to the signal from each sensor, cancelling ABS to return to normal braking when a malfunction has occurred in the ABS.

The EHCU has a self-diagnosing function which can indicate faulty circuits during diagnosis.

The EHCU is mounted on the engine compartment front right side. It consists of a Motor, Plunger Pump, Solenoid Valves and Check Valve.

On the outside, the relay box containing a motor relay and a valve relay is installed.

Solenoid Valves:  Reduces or holds the caliper fluid pressure for each front disc brake or both rear disc brakes according to the signal sent from the EHCU.

Reservoir:  Temporarily holds the brake fluid that returns from the front and rear disc brake caliper so that pressure of front disc brake caliper can be reduced smoothly.

Plunger Pump:  Feeds the brake fluid held in the reservoir to the master cylinder.

Motor:  Drives the pump according to the signal from EHCU.

Check Valve:  Controls the brake fluid flow.