Acura CSX. Manual - part 402
１０
Modulator Unit
Mode
VSA NO
Valve
VSA NC
Valve
Inlet
Solenoid
Valve
Outlet
Solenoid
Valve
Brake Fluid
Pressure
intensifying
mode
Pressure
retaining
mode
Pressure
reducing
mode
Pressure
adding
mode
19-113
FL
RR
RL
FR
OUT
OUT
IN
IN
VSA NO
VSA NC
REGULATOR
VALVE
PRESSURE
SENSOR
DAMPING
CHAMBER
RESERVOIR
MOTOR
RESERVOIR
VSA NC
VSA NO
REGULATOR
VALVE
IN
IN
OUT
OUT
MODULATOR UNIT
IN : INLET SOLENOID VALVE (NORMALLY OPEN)
OUT : OUTLET SOLENOID VALVE (NORMALLY CLOSED)
MASTER CYLINDER
The modulator unit consists of the inlet solenoid valve, the outlet solenoid valve, the VSA NO (normally open)
solenoid valve, the VSA NC (normally closed) solenoid valve, the reservoir, the pump, the pump motor, and the
damping chamber.
The hydraulic control has three modes at ABS action; pressure intensifying, pressure retaining, and pressure reducing.
Pressure adding mode is combined the TCS, VSA, and brake assist action.
The hydraulic circuit is an independent four channel type; one channel for each wheel.
•
•
•
•
open
closed
open
closed
Master cylinder fluid is pumped out to
the caliper.
open
closed
closed
closed
Caliper fluid is retained by the inlet
and outlet valves.
open
closed
closed
open
Caliper fluid flows through the
outlet valve to the reservoir.
The motor pumps the reservoir fluid
through the damping chamber to
the master cylinder .
closed
open
open
closed
Master cylinder fluid is pumped out
by pump with motor through VSA
NC valve to the caliper.
Caliper fluid pressure exceeds
master cylinder pressure.
: The motor will keep running until the operation of the one anti-lock brake control is finished with the first pressure
reducing mode.
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