Acura CSX. Manual — part 389
04
EBD Features
19-60
ABS Components
REAR WHEEL
BRAKE PRESSURE
With EBD under HEAVY LOAD
at REAR WHEELS
With EBD under LIGHT LOAD
at REAR WHEELS
Without EBD
FRONT WHEEL BRAKE PRESSURE
The electronic brake distribution (EBD) feature helps control vehicle braking by adjusting the rear brake force in
accordance with the rear wheel load before the ABS operates. Based on the wheel speed sensor signals, the control
unit uses the modulator to control the rear brakes individually. When the rear wheel speed is less than the front wheel
speed, the ABS modulator-control unit retains the current rear brake fluid pressure by closing the inlet valve in the
modulator. As the rear wheel speed increases, and approaches the front wheel speed, the ABS modulator-control unit
increases the rear brake fluid pressure by momentarily opening the inlet valve. This whole process is repeated very
rapidly. While this is happening, kickback may be felt at the brake pedal.
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05
Modulator Unit
Mode
Inlet Solenoid
Valve
Outlet Solenoid
Valve
Brake Fluid
19-61
MODULATOR UNIT
RESERVOIR
RL
FR
FL
RR
MASTER CYLINDER
IN: INLET SOLENOID VALVE (NORMALLY OPEN)
OUT: OUTLET SOLENOID VALVE (NORMALLY CLOSED)
MOTOR
PUMP
IN
IN
OUT
IN
OUT
IN
PUMP
RESERVOIR
DAMPING
CHAMBER
OUT
OUT
The ABS modulator consists of the inlet solenoid valve, the outlet solenoid valve, the reservoir, the pump, the pump
motor, and the damping chamber. The modulator reduces the caliper fluid pressure directly. It is a circulating-type
modulator because the brake fluid circulates through the caliper, the reservoir, and the master cylinder. The hydraulic
control has three modes; pressure intensifying, pressure retaining, and pressure reducing. The hydraulic circuit is an
independent four channel type; one channel for each wheel.
•
•
Pressure intensifying mode
open
closed
Master cylinder fluid is pumped out
to the caliper.
Pressure retaining mode
closed
closed
Caliper fluid is retained by the inlet
and outlet valves.
Pressure reducing mode
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 .
: 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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19-62
ABS Components
Circuit Diagram
BATTERY
UNDER-HOOD FUSE/RELAY BOX
1
19
28
27
G502
BLK
WHT
RED
WHT
WHT
RED
ABS
INDICATOR
BRAKE SYSTEM
INDICATOR
GAUGE CONTROL
MODULE (TACH)
LT GRN
GRN
LT BLU
WHT
RED
IGNITION SWITCH
IG1 HOT in ON (II) and START (III)
WHT
LT GRN
WHT
RED
BLU
WHT
BRAKE PEDAL
POSITION SWITCH
Closed: Brake pedal pressed
1
2
C1
C2
UNDER-DASH
FUSE/RELAY BOX
No. 4 (7.5 A)
No. 3 (30 A)
No. 1 (100 A)
No. 2 (50 A)
No. 3 (30 A)
No. 12 (15 A)
F16
B
G401
BRAKE FLUID
LEVEL SWITCH
Closed: Low fluid
1
2
BLK
ORN
H1
D8
3
6
ORN
1
PARKING
BRAKE SWITCH
Closed: Parking
brake applied
DATA LINK
CONNECTOR (DLC)
D2
YEL*
GRY*
ORN
6
16
4
7
14
IG1
1
2
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19-63
ABS MODULATOR-CONTROL UNIT
CONTROL UNIT
MODULATOR UNIT
LEFT-FRONT
RIGHT-FRONT
LEFT-REAR
RIGHT-REAR
PUMP MOTOR
G202
SOLENOIDS
8
9
12
3
2
18
14
5
6
15
25
24
1
17
10
16
WHT
RED
WHT
GRN
PNK
PUR
YEL
BLK
BLK
LT GRN
IC
1
2
1
2
2
1
1
2
LT BLU
RED
RED
ECM/PCM
WHT
RED
A40
A36
A37
WHT
RED
LT GRN
5 V
REGULATOR
CAN
CONTROLLER
IG1
ELECTRIC
CURRENT
LIMITATION
B
GND
IG1
: 12 V
: 5 V
RED
LT BLU
GRY
PUMP MOTOR RELAY
FAIL-SAFE RELAY
WHT
BLU
YEL*
GRY*
WHEEL SPEED SENSOR
*1: ’06 model
*2: ’07 model
IN
OUT
IN
OUT
IN
OUT
IN
OUT
VCC
FSR
B
MR
B
FL
B
FL-GND
FR
B
FR-GND
RL
B
RR
B
MR-GND
GND
CAN-H
CAN-L
K-LINE
IG1
RL-GND
RR-GND
1
2
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