Honda Odyssey 2004. Manual — part 323
ABS Operation Mode Table
Operation
Mode
Description
ABS
Indicator
TCS
Indicator
Brake
System
Indicator
On-board Diagnosis Function
19-98
ABS/TCS Components
System Description (cont’d)
Regular
operation
Operation in normal condition.
OFF
OFF
OFF
EBD Operation
Electronic Brake Distribution (EBD) operation.
OFF
OFF
OFF
Fail-safe
mode-S1
The ABS/TCS control unit turns the system off (ABS fail-
safe relay off) when the control unit detects a problem.
ON
ON
ON
Fail-safe
mode-A1
If the ABS/TCS control unit detects a malfunction while
the ABS, TCS, or EBD is operating, it will turn off the
malfunctioning component, and continue to modulate the
rest of the ABS system until completing the ABS, TCS, or
EBD operation. At that time, the entire system will be
turned off until the problem goes away.
ON
ON
ON
Fail-safe
mode-A0
If the ABS/TCS control unit detects a malfunction while
the ABS, TCS, or EBD is operating, it will turn off the
malfunctioning component, and continue to modulate the
rest of the ABS system until completing the ABS, TCS, or
EBD operation. At that time, the entire system will be
turned off until the problem goes away.
ON
ON
OFF
Fail-safe
mode-L1
The ABS/TCS control unit stores a DTC in back-up
memory when it detects a problem. If a problem is
detected when the ignition switch is turned ON (II), the
ABS/TCS control unit will turn the system off. If the
problem goes away, the ABS/TCS control unit will turn
the system on again.
ON
ON
ON
Fail-safe
mode-L0
The ABS/TCS control unit stores a DTC in back-up
memory when it detects a problem. If a problem is
detected when the ignition switch is turned ON (II), the
ABS/TCS control unit will turn only the ABS system off. If
the problem goes away, the ABS/TCS control unit will
turn the ABS system on again.
ON
ON
OFF
Fail-safe
mode-B1
The ABS/TCS control unit will turn the system off, if the
ignition voltage drops, and will turn it on again when the
ignition voltage returns to normal.
ON
ON
ON
Fail-safe
mode-B0
The ABS/TCS control unit will turn only the ABS system
off, if the ignition voltage drops, and will turn it on again
when the ignition voltage returns to normal.
ON
ON
OFF
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.
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TCS Self-diagnosis
TCS Self-diagnosis Table
Diagnostic
Trouble Code
(DTC)
Detection Item
Detection Timing
Fail-safe Mode
Initial
Diagnosis
Regular
Diagnosis
19-99
• The ABS/TCS control unit is equipped with a main CPU and a sub-CPU. Each CPU checks the other for problems.
• The CPUs check the circuit of the system.
• Self-diagnosis can be classified into two categories:
– Initial diagnosis: Done right after the engine starts and until the ABS or TCS indicator goes off
– Regular diagnosis: Done right after the initial diagnosis until the ignition switch is turned OFF
• When a problem is detected by self-diagnosis, the ABS/TCS control unit shifts to fail-safe mode.
24
27
TCS solenoid (short to body ground/short to
wire)
S1
28
TCS relay
S1
31
Engine retard command (PFINH) signal (open/
short to body ground)
A2
32
Engine speed (NEP) signal (open/short to body
ground)
A2
34
Reference voltage (VREF) signal (open/short to
body ground)
A2
36
Throttle position sensor output (THLOUT) signal
(open/short to body ground)
A2
61
A/T shift position (ATSFTP) signal (open/short to
body ground)
A2
81
Continuous TCS operation
A2
(cont’d)
03/07/29 09:56:09 61S0X050_190_0099
TCS Operation Mode Table
Operation
Mode
Description
ABS
Indicator
TCS Indicator
Brake
System
Indicator
On-board Diagnosis Function
19-100
ABS/TCS Components
System Description (cont’d)
•
•
•
Regular
operation
Operation in normal condition.
OFF
OFF
OFF
Fail-safe
mode-S1
The ABS/TCS control unit turns the system off (ABS
fail-safe relay off) when the control unit detects a
problem.
ON
ON
ON
Fail-safe
mode-A2
If the ABS/TCS control unit detects a malfunction
while the TCS is operating, it will turn off the
malfunctioning component, and continue to
modulate the rest of the TCS system until
completing the TCS operation. At that time, the
TCS system will be turned off.
OFF
ON
OFF
TCS deactivate
mode
If the front brake pad temperature rises excessively,
the ABS/TCS control unit stops the TCS system and
turns the TCS indicator on. When the brake pad
temperature lowers, the ABS/TCS control unit turns
off the TCS indicator and restarts the TCS system.
OFF
Comes ON when
the front brake
pad temperature
rises excessively.
OFF
TCS OFF mode
The ABS/TCS control unit cancels the TCS system
under these conditions:
If the ABS/TCS control unit detects a problem
with the PGM-FI communication circuit.
The ABS system is faulty.
The TCS system is OFF.
If these conditions return to normal, the ABS/TCS
control unit restarts the TCS system.
ON or OFF
(ON:
When the
ABS
system is
faulty)
ON
ON or OFF
(ON:
When the
EBD
system is
faulty)
The TCS 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.
03/07/29 09:56:10 61S0X050_190_0100
09
10
Modulator Unit
ABS Control
Pressure intensifying mode
Pump Motor
Pressure retaining mode
19-101
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
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
The modulator unit consists of the inlet solenoid valve, outlet solenoid valve, TCS normally open (NO) solenoid valve,
TCS normally closed (NC) solenoid valve, reservoir, pump, pump motor, and the damping chamber.
The modulator controls 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.
TCS NO valve open, TCS NC valve closed, inlet valve open, outlet valve closed.
Master cylinder fluid is pumped out to the caliper.
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.
TCS NO valve open, TCS NC valve closed, inlet valve closed, outlet valve closed.
Caliper fluid is retained by the inlet valve and outlet valve.
(cont’d)
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