Shown in normal braking mode

Fig 1: Identifying Modulator Unit Wiring Diagram

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Normal braking mode: Inlet valve open, outlet valve closed:

Master cylinder fluid is pumped out to the caliper.

Pressure retaining mode: Inlet valve closed, outlet valve closed:

Caliper fluid is retained by the inlet valve and outlet valve.

Pressure reducing mode: Inlet valve closed, outlet valve open:

Caliper fluid flows through the outlet valve to the reservoir.

When in pressure reducing mode, the pump motor is ON.

The reservoir fluid is pumped out by the pump, through the damping chamber, to the master cylinder.

When stopping ABS operation, the pump motor is OFF.