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3) HOLD (ABS is working) Mode
As hydraulic pressure on each wheel increases, the wheel tends to lock. In order to prevent the
wheel from locking, the hydraulic valve modulator operates the inlet valve control solenoid to stop
increasing the hydraulic pressure by closing the inlet valve. At this moment, the outlet valve is
closed. This procedure helps the wheel to maintain a constant hydraulic pressure.
Solenoid valve
Inlet valve - Normal open (NO) valve
Outlet valve - Normal close (NC) valve
Valve Open/Close
Close
Close
10-21
4890-00
Pump motor
OFF
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