Acura RSX Honda Integra. Manual — part 361
04
ABS Control Unit
Main Control
Self-diagnosis Function
On-board Diagnosis Function
19-41
RIGHT-REAR
WHEEL SENSOR
LEFT-REAR
WHEEL SENSOR
RIGHT-FRONT
WHEEL SENSOR
LEFT-FRONT
WHEEL SENSOR
DETECT
WHEEL SPEED
DETECT
WHEEL SPEED
DETECT
WHEEL SPEED
DETECT
WHEEL SPEED
DETECT
VEHICLE SPEED
SELECT LOW
SPEED WHEEL
DETECT
SLIP RATE
DETECT
SLIP RATE
DETECT
SLIP RATE
RIGHT-FRONT
LEFT-FRONT
REAR
REFERENCE
SLIP RATE
ABS
CONTROL
ABS
CONTROL
ABS
CONTROL
DRIVE
SOLENOID
DRIVE
SOLENOID
DRIVE
SOLENOID
DRIVE
SOLENOID
RIGHT-REAR
SOLENOID
LEFT-REAR
SOLENOID
RIGHT-FRONT
SOLENOID
LEFT-FRONT
SOLENOID
ABS CONTROL UNIT
The ABS control unit detects the wheel speed based on the wheel sensor signal it received, then it calculates the
vehicle speed based on the detected wheel speed. The control unit detects the vehicle speed during deceleration
based on the rate of deceleration.
The ABS control unit calculates the slip rate of each wheel, and transmits the control signal to the modulator unit
solenoid valve when the slip rate is high.
The hydraulic control has three modes: Pressure reducing, pressure retaining, and pressure intensifying.
1. The ABS control unit is equipped with a main CPU and a subCPU. Each CPU checks the other for problems.
2. The CPUs check the system circuits.
3. The ABS control unit turns on the ABS indicator when the unit detects a problem, and the unit stops ABS
operation.
4. The self-diagnosis can be classified into these two categories:
• Initial diagnosis
• Regular diagnosis
The ABS can be diagnosed with the HDS.
The ALB Checker cannot be used with this system. For air bleeding, and checking wheel sensor signals, use the HDS.
See the HDS Help menu for specific operating instructions.
(cont’d)
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03
ABS Modulator
19-42
ABS Components
System Description (cont’d)
MODULATOR UNIT
RL
FR
FL
RR
MASTER CYLINDER
OUT
IN : INLET VALVE (NORMALLY OPEN)
OUT: OUTLET VALVE (NORMALLY CLOSED)
OUT
MOTOR
PUMP
RESERVOIR
OUT
IN
IN
IN
IN
OUT
PUMP
RESERVOIR
M
The ABS modulator consists of the inlet solenoid valve, outlet solenoid valve, reservoir, pump, and the pump motor.
The modulator reduces the caliper fluid pressure directly. It is a circulating-type modulator because the brake fluid
circulates through the caliper, 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:
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.
Motor operation mode:
When starting the pressure reducing mode, the pump motor is ON.
When stopping ABS operation, the pump motor is OFF.
The reservoir fluid is pumped out by the pump, through the damping chamber, to the
master cylinder.
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02
03
Wheel Sensors
Wheel Speed and Modulator Control
19-43
GEAR PULSER
WHEEL SENSOR
at HIGH SPEED
at LOW SPEED
VO
LTAG
E
SPEED
VEHICLE SPEED
REFERENCE VEHICLE SPEED
PRESSURE
ON
OUTLET
VALVE
OFF
INLET
VALVE ON
OFF
MOTOR
ON
OFF
WHEEL SPEED
TIME
The wheel sensors are the magnetic contactless type. As the gear pulser teeth rotate past the wheel sensor’s magnetic
coil, AC current is generated. The AC frequency changes in accordance with the wheel speed. The ABS control unit
detects the wheel sensor signal frequency and thereby detects the wheel speed.
When the wheel speed drops sharply below the vehicle speed, the outlet valve opens momentarily to reduce the
caliper fluid pressure. The pump motor starts at this time. As the wheel speed is restored, the inlet valve opens
momentarily to increase the caliper fluid pressure.
05/06/27 18:20:30 61S6M040_190_0043
*90
S6M6A06D10600000000EAAT10
+
+
19-44
ABS Components
Circuit Diagram
IG1
IG2
K7
I2
10
B7
2
2
*1
*2
A6
1
2
1
2
1
2
1
B18
A14
*1
B12
*2
*1
A15
*2
BATTERY
UNDER-HOOD
FUSE/RELAY BOX
B
No. 7 (15 A)
No. 19 (100 A )
No. 20
No. 8 (20 A)
No. 10 (30 A)
BRAKE PEDAL POSITION SWITCH
Closed: Brake pedal pressed
IGNITION SWITCH
No. 10 (7.5 A)
No. 11 (7.5 A)
WHEEL SENSOR
LEFT-FRONT
B
DATA LINK
CONNECTOR (16P)
WHT/GRN
WHT
BLK/YEL
BLK/ORN
WHT/RED
BRN/YEL
GRY
BRN
RIGHT-FRONT
LEFT-REAR
RIGHT-REAR
G401
BLK
GAUGE ASSEMBLY
WHT/BLK
UNDER-DASH
FUSE/RELAY BOX
YEL
BLK/RED
G101
WHT/GRN
WHT/RED
(U.S.A. 40 A,
Canada 50 A)
G401
BLU/RED
BLK
CPU
BRN/WHT
GRN/BLK
BLU
YEL/RED
GRY/RED
WHT/GRN
WHT/BLK
BLK/ORN
WHT/RED
BLU/ORN
BRN
BLU/YEL
GRN/YEL
GRY
1
2
14
16
5
4
9
ABS
INDICATOR
*1: ’02-04 models
*2: ’05-06 models
05/06/27 18:20:30 61S6M040_190_0044
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