Honda Odyssey 2004. Manual — part 324
11
12
Pressure reducing mode
Pressure intensifying mode
TCS Control
19-102
ABS/TCS Components
System Description (cont’d)
MODULATOR UNIT
TCS NO
TCS NC
TCS NC
TCS NO
DAMPING
CHAMBER
IN
OUT
RESERVOIR
M
IN
OUT
RL
FR
FL
RR
IN
RESERVOIR
IN
OUT
PUMP
PUMP
DAMPING
CHAMBER
MOTOR
MASTER CYLINDER
OUT
MODULATOR UNIT
TCS NO
TCS NC
TCS NC
TCS NO
DAMPING
CHAMBER
IN
OUT
RESERVOIR
M
IN
OUT
RL
FR
FL
RR
IN
OUT
RESERVOIR
IN
OUT
PUMP
PUMP
DAMPING
CHAMBER
MOTOR
MASTER CYLINDER
TCS NO valve open, TCS NC valve closed, inlet valve closed, outlet valve open.
Caliper fluid flows through the outlet valve to the reservoir.
TCS NO valve closed, TCS NC valve open, inlet valve open, outlet valve closed, pump motor ON.
The reservoir and master cylinder fluid is pumped out by the pump, through the damping chamber, to the front caliper.
03/07/29 09:57:21 61S0X050_190_0102
13
14
Pressure retaining mode
Pressure reducing mode
19-103
MODULATOR UNIT
TCS NO
TCS NC
TCS NC
TCS NO
DAMPING
CHAMBER
IN
OUT
RESERVOIR
M
IN
OUT
RL
FR
FL
RR
IN
OUT
RESERVOIR
IN
OUT
PUMP
PUMP
DAMPING
CHAMBER
MOTOR
MASTER CYLINDER
OUT
MODULATOR UNIT
TCS NO
TCS NC
TCS NC
TCS NO
DAMPING
CHAMBER
IN
OUT
RESERVOIR
M
IN
OUT
RL
FR
FL
RR
IN
RESERVOIR
IN
OUT
PUMP
PUMP
DAMPING
CHAMBER
MOTOR
MASTER CYLINDER
TCS NO valve closed, TCS NC valve open, inlet valve closed, outlet valve closed, pump motor ON.
Front caliper fluid is retained by the inlet valve and outlet valve.
TCS NO valve closed, TCS NC valve open, front inlet valve closed, front outlet valve open, pump motor ON.
Caliper fluid flows through the outlet valve to the reservoir.
(cont’d)
03/07/29 09:57:22 61S0X050_190_0103
15
16
Wheel Sensor
Wheel Speed and Modulator Control (ABS)
19-104
ABS/TCS Components
System Description (cont’d)
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/TCS 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.
03/07/29 09:57:23 61S0X050_190_0104
17
Wheel Speed and Modulator Control (TCS)
19-105
SPEED
BRAKE
PRESSURE
OUTLET
VALVE
INLET
VALVE
MOTOR
OFF
TIME
DRIVE WHEEL SPEED
REFERENCE DRIVE
WHEEL SPEED
DRIVEN WHEEL SPEED
(VEHICLE SPEED)
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
TCS NC VALVE
TCS NO VALVE
When the front wheel speed rises sharply above the vehicle speed, the TCS NC valve opens, the TCS NO valve closes,
and the pump motor starts to intensify the front caliper fluid pressure. When the wheel speed drops, the front inlet
valve closes momentarity to retain the front caliper fluid pressure. When the wheel speed drops further, the front
outlet valve opens momentarily to reduce the front caliper fluid pressure.
03/07/29 09:57:23 61S0X050_190_0105
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