Honda Odyssey 2004. Manual — part 312
16
17
ABS Modulator
19-54
ABS Components
System Description (cont’d)
SOLENOID VALVE
PUMP MOTOR
The ABS modulator consists of the inlet solenoid valve, outlet solenoid valve, reservoir, pump, 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, 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 caliper fluid is pumped out by the pump, through the damping chamber, to the
master cylinder.
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18
19
Wheel Sensors
Wheel Speed and Modulator Control
19-55
GEAR PULSER
WHEEL SENSOR
at HIGH SPEED
at LOW SPEED
VO
LTAG
E
SPEED
VEHICLE SPEED
REEFRENCE 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 inlet valve closes and if necessary 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 outlet valve closes, and the inlet valve opens momentarily to increase the caliper fluid pressure.
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19-56
ABS Components
Circuit Diagram
IG1
IG2
1
4
2
3
5
4
3
C4
J5
1
1
2 ( 3)
B
UNDER-HOOD FUSE/RELAY BOX
STOP (20A)
BATTERY (120A)
IG1 MAIN (50A)
ABS F/S (20A)
ABS MOTOR (30A)
BRAKE SWITCH
Closed: Brake pedal depressed
IGNITION
SWITCH
DRIVER’S UNDER-DASH
FUSE/RELAY BOX
R/C MIRROR (7.5A)
UNDER-HOOD
ABS RELAY BOX
ABS
FAIL-SAFE
RELAY
BRN/BLK BLK
BACKUP LIGHT (10A)
WHT/GRN
YEL
WHT
WHT/YEL
G201
BLK/YEL
GRN
RED/BLU
YEL/BLU
RED/BLK
YEL/BLK
RED/GRN
YEL/GRN
RED/WHT
YEL/WHT
*: With cruise control
YEL/BLK
YEL/GRN
UNDER-HOOD
ABS RELAY BOX
PASSENGER’S UNDER-DASH
FUSE/RELAY BOX
ABS
PUMP
MOTOR
RELAY
YEL/RED
BRN/BLK
WHT/BLU
WHT
GRN
BRN/BLK
BRAKE SYSTEM
INDICATOR
GAUGE ASSEMBLY
BRAKE FLUID
LEVEL SWITCH
Closed: Low fluid
ALTERNATOR
GRN/RED
BLU/WHT
BLK
GRN/RED
YEL/WHT
YEL/BLK
YEL/GRN
MODULATOR UNIT
FL-IN
FL-OUT
FR-IN
RL-IN
FR-OUT
RL-OUT
RR-IN
RR-OUT
YEL/RED
WHT/BLK
1 ( 2)
YEL
WHT/BLU
PUMP MOTOR
G302
BLK
BATTERY
*
*
B1
A6
E16
I4
C14
B8
C10
B16
B11
B14
10
4
8
1
5
2
6
3
7
OUT
IN
OUT
IN
OUT
IN
OUT
IN
2
ABS MOTOR CHECK (7.5A)
ABS
INDICATOR
G301
WHT/BLU
G503
RIGHT-REAR
SOLENOID
LEFT-FRONT
SOLENOID
RIGHT-FRONT
SOLENOID
LEFT-REAR
SOLENOID
M
UNDER-HOOD FUSE/RELAY BOX CONNECTORS
CONNECTOR A (18P)
CONNECTOR B (7P)
BRAKE SWITCH CONNECTOR
DRIVER’S UNDER-DASH FUSE/RELAY BOX CONNECTORS
CONNECTOR I (18P)
CONNECTOR C (18P)
CONNECTOR B (22P)
PASSENGER’S UNDER-DASH FUSE/RELAY BOX CONNECTORS
CONNECTOR J (16P)
GAUGE ASSEMBLY CONNECTORS
CONNECTOR C (16P)
ABS PUMP MOTOR
RELAY CONNECTOR
ABS FAIL-SAFE RELAY
CONNECTOR
CONNECTOR E (20P)
2P CONNECTOR
4P CONNECTOR
(With cruise control)
MODULATOR UNIT
CONNECTOR
(
number)
PUMP MOTOR
CONNECTOR
(
number)
Wire side of female terminals
Terminal side of female terminals
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―
+
―
+
+
―
―
+
―
+
+
19-57
A10
A16
B9
B4
B11
B6
B10
B5
B8
B3
A20
A19
A18
A17
A8
A9
A6
A7
A14
A22
A2
A11
A21
B1
B12
B2
B7
A1
A12
ABS CONTROL UNIT (NK1-EBD)
DTC
EEPROM
STOP
MCK
IG2
BRAKE
LIGHT
WHT/BLK
WHT/BLK
GRN
FL-IN
FL-OUT
FR-IN
FR-OUT
RL-IN
RL-OUT
RR-OUT
RR-IN
FRW (
)
FRW (
)
FLW (
)
FLW (
)
RLW (
)
RLW (
)
RRW (
)
RRW (
)
(
)
(
)
WHEEL SENSOR
LEFT-
FRONT
RIGHT-
FRONT
LEFT-
REAR
RIGHT-
REAR
RED/BLU
YEL/BLU
RED/BLK
YEL/BLK
RED/GRN
YEL/GRN
RED/WHT
YEL/WHT
SCS
DATA LINK
CONNECTOR (16P)
VCC
DLC
B
VCC
TXD
RXD
G101
G501
BLK
GRN/BLU
BRN
GRN/BLK
GRN
LT BLU
GRY
GRN/YEL
BLU/YEL
BRN
LT BLU
PARKING
BRAKE SWITCH
Closed: Brake lever
pulled
YEL/WHT
BLU/WHT
GRN/RED
IG2
FSR
PMR
To IG2
To VCC
YEL/BLK
YEL/GRN
YEL/RED
PARK
WALP
IG2
G303
G303
GND3
GND2
GND1
BLK
BLK
BLK
GND4
1
2
1
2
2
1
2
1
DAYTIME RUNNING
LIGHTS CONTROL UNIT
1
8
12
13
6
WHT/GRN
BRN/BLK
USA
Canada
GRN/WHT
GRN/RED
5 V
REGULATOR
ABS CONTROL UNIT CONNECTORS
CONNECTOR A (22P)
CONNECTOR B (12P)
WHEEL SENSOR CONNECTOR
FRONT
REAR
DATA LINK CONNECTOR (16P)
Terminal side of
male terminals
Wire side of
female terminals
Wire side of female terminals
03/07/29 09:55:46 61S0X050_190_0057
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