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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19-114
VSA System Components
Circuit Diagram
UNDER-DASH
FUSE/RELAY BOX
No. 4 (7.5 A)
IGNITION SWITCH
IG1 HOT in ON (II) and START (III)
BRAKE PEDAL
POSITION SWITCH
Closed: Brake pedal pressed
1
2
WHT
RED
YAW RATE-
LATERAL
ACCELERATION
SENSOR
WHT
RED
1
3
4
YEL
5
BLK
4
2
1
VSA OFF SWITCH
WHT
WHT
RED
5
No. 3 (40 A)
No. 1 (100 A)
No. 2 (50 A)
No. 3 (30 A)
No. 12 (15 A)
UNDER-HOOD FUSE/RELAY BOX
BATTERY
ABS
INDICATOR
BRAKE SYSTEM
INDICATOR
1
VSA ACTIVATION
INDICATOR
VSA
INDICATOR
19
28
27
GAUGE CONTROL
MODULE (TACH)
BRN
B
WHT
29
RED
GRN
14
RED
G501
C2
C1
E24
F16
YEL
G602
BLU
LT GRN
GRY
RED
BRN
BLK
WHT
LT GRN
GRY
H1
D8
3
6
D2
G502
BLK
WHT
RED
WHT
LT BLU
B
G401
BRAKE FLUID
LEVEL SWITCH
Closed: Low fluid
1
2
BLK
ORN
ORN
1
PARKING
BRAKE SWITCH
Closed: Parking
brake applied
DATA LINK
CONNECTOR (DLC)
ORN
IG1
6
16
4
7
14
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19-115
VSA MODULATOR-CONTROL UNIT
CONTROL UNIT
5 V
REGULATOR
MODULATOR UNIT
VSA1
VSA2
LEFT-FRONT
RIGHT-FRONT
LEFT-REAR
RIGHT-REAR
PUMP MOTOR
G202
PRESSURE
SENSOR
SOLENOIDS
IC
13
14
22
11
19
6
20
8
9
21
37
36
34
17
3
7
10
15
1
26
1
2
1
2
2
1
1
2
28
WHT
RED
GRN
PUR
BLU
ORN
BRN
WHT
RED
LT BLU
GRN
PNK
BLK
BLK
LT GRN
WHT
RED
A40
A36
A37
WHT
RED
2
4
3
5
1
STEERING
ANGLE
SENSOR
PUR
LT GRN
RED
LT BLU
GRY
PUMP MOTOR RELAY
FAIL-SAFE RELAY
VCC
VCC
IG1
CAN
CONTROLLER
: 12 V
: 5 V
VCC
ELECTRIC
CURRENT
LIMITATION
B
GND
IG1
VCC
GRY
BLU
YEL
RED
WHT
ECM/PCM
WHEEL SPEED SENSOR
NC
NO
NC
NO
IN
OUT
IN
OUT
IN
OUT
IN
OUT
FSR
B
MR
B
FL
B
FL-GND
FR
B
FR-GND
RL
B
RL-GND
RR
B
RR-GND
MR-GND
GND
STR-A
STR-B
STR-D
SVCC
SGND
CAN-H
CAN-L
K-LINE
IG1
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19-116
VSA System Components
BRAKE PEDAL POSITION
SWITCH 4P CONNECTOR
PARKING BRAKE SWITCH
1P CONNECTOR
DATA LINK CONNECTOR (DLC)
VSA OFF SWITCH
5P CONNECTOR
YAW RATE-LATERAL
ACCELERATION SENSOR
5P CONNECTOR
STEERING ANGLE SENSOR
5P CONNECTOR
BRAKE FLUID LEVEL SWITCH
2P CONNECTOR
UNDER-HOOD
FUSE/RELAY BOX
CONNECTOR C (2P)
WHEEL SPEED SENSOR
2P CONNECTOR
ECM/PCM CONNECTOR A (44P)
GAUGE CONTROL MODULE (TACH) 36P CONNECTOR
VSA MODULATOR-CONTROL UNIT 37P CONNECTOR
UNDER-DASH FUSE/RELAY BOX CONNECTOR F (34P)
UNDER-DASH FUSE/RELAY BOX CONNECTOR E (42P)
Wire side of female terminals
Terminal side of female terminals
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