Page 38 of 3342
![SUBARU LEGACY 1997 Service Repair Manual
BRAKES
[ABS
5
.31
TYPE]
[T501]
4-4d
5
.
Control
Module
I/O
Signal
Terminal
N
Input/Output
signal
Contents
o
.
_)
Measured
value
andmeasuring
conditions
ABS
Front
left
wheel
9-10
sensor2
Fron SUBARU LEGACY 1997 Service Repair Manual
BRAKES
[ABS
5
.31
TYPE]
[T501]
4-4d
5
.
Control
Module
I/O
Signal
Terminal
N
Input/Output
signal
Contents
o
.
_)
Measured
value
andmeasuring
conditions
ABS
Front
left
wheel
9-10
sensor2
Fron](/manual-img/17/57434/w960_57434-37.png)
BRAKES
[ABS
5
.31
TYPE]
'
[T501]
4-4d
5
.
Control
Module
I/O
Signal
Terminal
N
Input/Output
signal
Contents
o
.
_)
Measured
value
andmeasuring
conditions
ABS
Front
left
wheel
9-10
sensor'2
Front
right
wheel
11-12
0
.12
-
1
V
(Wheel
speed
Rear
left
wheel
7-8
(When
it
is
20Hz
.)
sensor)
Rear
right
wheel
14-15
Valve
relay
power
supply
24-23
10
-
15
Vwhen
ignition
switch
is
ON
.
Motor
relay
power
supply
25-23
10
-
15
Vwhen
ignition
switch
is
ON
.
G
sensor'2
Power
supply
30-28
4
.75
-
5
.25
V
(AWD
model
ground
28
-
only)
output
6-28
2
.3f0
.2
V
when
vehicle
isin
horizontal
position
.
Stop
light
switch*1
2-23
Less
than
1
.5
V
when
the
stop
light
is
OFF
and,10
-
15
V
when
thestop
light
is
ON
.
ABS
warning
light`2
21-23
Less
than
1.5
V
during
1
.5
seconds
when
ignition
switch
is
ON,and
10
-
15
V
after
1.5
seconds
.
AT
ABS
signal'2
(AT
model
only)
31-23
Less
than
1
.5
V
when
the
ABS
control
does
not
operate
still
and
more
than5
.5
V
when
ABS
operates
.
ABS
operation
signal
monitor*2
3--23
Less
than
1
.5
V
when
the
ABS
control
does
not
operate
still
and
more
than5
.5
V
when
ABS
operates
.
Select
Data
is
received
.
20-23
Less
than
1
.5
V
when
no
data
is
received
.
monitor'2
Data
is
sent
.
5--23
4
.75
-
5
.25
V
when
no
data
is
sent
.
ABS
Terminal
No
.
3
29-23
10
-
15
V
when
ignition
switch
is
ON
.
diagnosis
connector*2
Terminal
No
.
6
4-23
10
-
15
V
when
ignition
switch
is
ON
.
Power
supply'1
1-23
10
-
15
V
when
ignition
switch
is
ON
.
Grounding
line
23
-
Grounding
line
~26
*1
:
Measure
the
I/O
signal
voltage
after
removing
the
connector
from
the
ABSCM&H/U
terminal
.
'2
:
Measure
the
I/O
signal
voltage
at
connector
(F2)
or
(Fi)
.
9
Page 39 of 3342
4-4d
[TSOZ]
BRAKES
[ABS
5
.31
TYPE]
5
.
Control
Module
I/O
Signal
2
.
I/O
SIGNAL
DIAGRAM
Ignition
key
switch
84101229A
10
Page 40 of 3342
![SUBARU LEGACY 1997 Service Repair Manual
BRAKES
[ABS
5
.31
TYPE]
[rsao]
4-4d
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
I
TROUBLE
OCCURS
.I
Is
Select
Monitor
available?
I
Yes
1
10
.
Diagnostic
Chart
with
Select
1
Monitor
.
Ask
SUBARU LEGACY 1997 Service Repair Manual
BRAKES
[ABS
5
.31
TYPE]
[rsao]
4-4d
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
I
TROUBLE
OCCURS
.I
Is
Select
Monitor
available?
I
Yes
1
10
.
Diagnostic
Chart
with
Select
1
Monitor
.
Ask](/manual-img/17/57434/w960_57434-39.png)
BRAKES
[ABS
5
.31
TYPE]
[rsao]
4-4d
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
I
TROUBLE
OCCURS
.I
Is
Select
Monitor
available?
I
Yes
1
10
.
Diagnostic
Chart
with
Select
1
Monitor
.
Ask
the
customer
when
and
how
the
trouble
occurred
using
interview
check
list
.
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
A
:
BASIC
DIAGNOSTICS
PROCEDURE
I
PRE-INSPECTION
I
I
CALLING
UPA
TROUBLE
CODE
.
I
No
trouble
code
is
readable
.
Inspection
using
Diagnostic
Chart
for
Warning
Light
Failure
.
Record
all
trouble
codes
.
Only
the
start
code
is
issued
.
Trouble
codes
are
issued
.
Perform
diagnostics
in
accordance
with
trouble
code
.
Trouble
code
I
Repair
.
designated
.
Clear
memory
.
I
INSPECTION
MODE
I
I
CALLING
UPA
TROUBLE
CODE
.
Only
the
star
t
code
is
issued
.
CONFIRMATION
TEST
END
Inspection
using
General
Diagnostics
chart
.
B4M
1051
A
CAUTION
:
Remove
foreign
matter
(dust,
water,
etc
.)
from
the
ABSCM&H/U
connector
during
removal
and
installation
.
NOTE
:
e
To
check
harness
for
broken
wires
or
short
circuits,
shake
it
while
holding
it
or
the
connector
.
*
When
ABS
warning
light
illuminates,
read
and
record
trouble
code
indicated
by
ABS
warning
light
.
11
Page 41 of 3342
![SUBARU LEGACY 1997 Service Repair Manual
4-4d
[TSBO]
BRAKES
[ABS
5
.31
TYPE]
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
B
:
CHECK
LIST
FOR
INTERVIEW
Check
the
following
items
about
the
vehicles
state
.
1
.
THE
STATE
OF
THE
ABS SUBARU LEGACY 1997 Service Repair Manual
4-4d
[TSBO]
BRAKES
[ABS
5
.31
TYPE]
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
B
:
CHECK
LIST
FOR
INTERVIEW
Check
the
following
items
about
the
vehicles
state
.
1
.
THE
STATE
OF
THE
ABS](/manual-img/17/57434/w960_57434-40.png)
4-4d
[TSBO]
BRAKES
[ABS
5
.31
TYPE]
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
B
:
CHECK
LIST
FOR
INTERVIEW
Check
the
following
items
about
the
vehicle's
state
.
1
.
THE
STATE
OF
THE
ABS
WARNING
LIGHT
ABS
warning
light
O
Always
comes
on
.
D
Sometimes
O
Onlyonce
O
Does
not
come
on
o
When
/how
long
does
it
come
on?
:
Ignition
key
position
O
LOCK
D
ACC
OON
(before
starting
engine)
D
START
O
On
afterstarting
(Engine
is
running)
O
On
after
starting
(Engine
is
stop)
Timing
O
Immediately
afterignition
is
ON
.
O
Immediately
after
ignition
starts
.
O
When
advancing
km/h
to
km/h
MPH
to
MPH
D
While
traveling
at
a
constant
speed
km/h
MPH
D
When
decelerating
km/h
to
km/h
MPH
to
MPH
OWhen
turning
to
right
Steering
angle
:
deg
Steering
time
:
sec
D
When
turning
to
left
Steering
angle
:
deg
Steering
time
:
sec
D
When
moving
other
electrical
parts
Parts
name
Operating
condition
2
.
SYMPTOMS
ABS
operating
D
Performsno
work
.
condition
D
Operates
only
when
abruptly
applying
brakes
.
Vehicle
speed
:
km/h
MPH
~
How
to
step
on
brake
pedal
a)
Operating
time
:
sec
b)
Operating
noise
:
O
Produce
/
D
Does
not
produce
oWhat
kind
of
noise?
O
Knock
O
Gong
gong
D
Bong
a
Buzz
D
Gong
gong
buzz
O
Others
c)
Reaction
force
of
brake
pedal
O
Stick
O
Press
down
once
with
a
clunk
O
Press
and
released
D
Others
12
Page 42 of 3342
![SUBARU LEGACY 1997 Service Repair Manual
BRAKES
[ABS
5
.31
TYPE]
[MO]
4-4d
6
.
DiagnosticsChart
for
On-board
Diagnosis
System
Behavior
of
vehicle
a)
Directional
stability
cannotbe
obtained
or
steering
arm
refuses
to
work
when
applying
bra SUBARU LEGACY 1997 Service Repair Manual
BRAKES
[ABS
5
.31
TYPE]
[MO]
4-4d
6
.
DiagnosticsChart
for
On-board
Diagnosis
System
Behavior
of
vehicle
a)
Directional
stability
cannotbe
obtained
or
steering
arm
refuses
to
work
when
applying
bra](/manual-img/17/57434/w960_57434-41.png)
BRAKES
[ABS
5
.31
TYPE]
[MO]
4-4d
6
.
DiagnosticsChart
for
On-board
Diagnosis
System
Behavior
of
vehicle
a)
Directional
stability
cannotbe
obtained
or
steering
arm
refuses
to
work
when
applying
brakes
O
Yes
/
ONo
When
:
D
Vehicle
turns
to
right
o
Vehicle
turns
to
left
D
Spins
D
Others
b)
Directional
stability
cannot
be
obtained
orsteering
arm
refuses
to
work
when
accelerating
O
Yes
/
O
No
When
:
O
Vehicle
turns
to
right
O
Vehicle
turns
to
left
D
Spins
O
Others
c)
Brakes
areout
of
order
:
O
Yes
/
ONo
What
:
O
Braking
distance
is
long
O
Brakes
lockor
drag
D
Pedal
stroke
is
long
D
Pedal
sticks
O
Others
d)
Poor
acceleration
:
D
Yes
/
ONo
What
:
D
Fails
to
accelerate
o
Engine
stalls
o
Others
e)
Occurrence
of
vibration
:
D
Yes
/
[]No
Where
What
kind
f)
Occurrence
of
abnormal
noise
:
O
Yes
/
DNo
Where
What
kind
g)
Occurrence
of
other
phenomena
:
D
Yes
/
ONo
What
kind
3
.
CONDITIONS
UNDER
WHICH
TROUBLE
OCCURS
Environment
a)
Weather
D
Fine
O
Cloudy
O
Rainy
D
Snowy
O
Various/Others
b)
Ambient
temperature
F(°C)
c)
Road
D
Urban
area
D
Suburbs
O
Highway
O
General
road
D
Ascending
slope
O
Descending
slope
O
Paved
road
O
Gavel
road
O
Muddy
road
O
Sandy
place
Cl
Others
d)
Road
surface
D
Dry
D
Wet
O
New-fallen
snow
O
Compressed
snow
O
Frozen
slope
O
Others
13
Page 43 of 3342
4-4d
[TSao]
BRAKES
[ABS
5
.3i
TYPE]
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
Condition
a)
Brakes
Deceleration
:
g
O
Continuous
/
Olntermittent
b)
AcceleratorAcceleration
:
g
O
Continuous
/
O
Intermittent
c)
Vehicle
speed
km/h
MPH
O
Advancing
O
Accelerating
O
Reducing
speed
O
Low
speed
O
Turning
D
Others
d)
Tire
inflation
pressure
Front
RH
tire
:
kPa
Front
LH
tire
:
kPa
Rear
RH
tire
:
kPa
Rear
LH
tire
:
kPa
e)
Degree
of
wear
Front
RH
tire
Front
LH
tire
Rear
RH
tire
Rear
LH
tire
f)
Genuine
parts
are
used
.:
Yes
/
ONo
g)
Chain
is
passed
around
tires
.:
Yes
/
DNo
h)
T
tire
is
used
.:
Yes
/
ONo
i)
Condition
of
suspension
alignment
j)
Loading
state
k)
Repair
parts
are
used
.
:
OYes
/
ONo
What
I)
Others
14
Page 44 of 3342
![SUBARU LEGACY 1997 Service Repair Manual
BRAKES
[ABS
5
.31
TYPE]
[T6D1]4-4d
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
Diagnosisconnector
--J
-\
o
o
Diagnosis
terminals
3
terminal
6
terminal
/
B4M0082D
C
:
INSPECTION
MODE
R SUBARU LEGACY 1997 Service Repair Manual
BRAKES
[ABS
5
.31
TYPE]
[T6D1]4-4d
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
Diagnosisconnector
--J
-\
o
o
Diagnosis
terminals
3
terminal
6
terminal
/
B4M0082D
C
:
INSPECTION
MODE
R](/manual-img/17/57434/w960_57434-43.png)
BRAKES
[ABS
5
.31
TYPE]
[T6D1]4-4d
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
Diagnosisconnector
--J
-\
o
o
Diagnosis
terminals
3
terminal
6
terminal
/
B4M0082D
C
:
INSPECTION
MODE
Reproduce
thecondition
underwhich
the
problem
has
occurred
as
much
as
possible
.
Drive
the
vehicle
at
a
speed
more
than40
km/h
(25
MPH)
forat
least
one
minute
.
D
:
TROUBLE
CODES
When
on-board
diagnosis
of
the
ABS
control
module
detects
a
problem,
the
information
(up
to
a
maximum
of
three)
will
be
stored
in
the
EEP
ROM
asa
trouble
code
.
When
there
are
more
than
three,
the
most
recent
three
will
be
stored
.
(Stored
codes
will
stay
in
memory
until
they
are
cleared
.)
1
.
CALLING
UP
A
TROUBLE
CODE
1)
Take
out
diagnosis
connector
from
side
ofdriver's
seat
heater
unit
.
2)
Turn
ignition
switch
OFF
.
3)
Connect
diagnosis
connector
terminal
6
to
diagnosis
terminal
.
4)
Turn
ignition
switch
ON
.
5)
ABS
warning
light
is
set
in
the
diagnostic
mode
and
blinks
toidentify
trouble
code
.
6)
After
the
start
code
(11)
is
shown,
the
trouble
codes
will
be
shown
in
order
of
the
last
information
first
.
These
repeat
for
a
maximum
of
5
minutes
.
NOTE
:
When
there
are
no
trouble
codes
in
memory,
only
the
start
code
(11)
is
shown
.
Example
of
code
indication
Trouble
code
:
21
ON
111
1
2
1
1
2
OFF
~'2
sec
1
.0s
ec
1
.2
sec
1.2
sec
1
.0
sec
U
~~
U
U
L
.-J
0
.3
sec
0
.3
sec
0
.3
sec
Start
code
Trouble
code
21
Start
code
Trouble
code
21
Trouble
code
:
22,
31
ON
1
1
22
3
1
11
OFF
Start
code
Trouble
code
22
Trouble
code
31Start
code
B4M0232A
15
Page 45 of 3342
4-4d[T6D2]
BRAKES
[ABS
5
.3i
TYPE]
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
Diagnosis
connector
-J
_
~\~
°°
Diagnosis
terminals
3
terminal
6
terminal
/
84M00820
2
.
CLEARING
MEMORY
1)
After
calling
up
a
trouble
code,disconnect
diagnosis
connector
terminal
6from
diagnosis
terminal
.
2)
Repeat
3
times
within
approx
.
12
seconds
;
connecting
and
disconnecting
terminal
6
and
diagnosis
terminal
for
at
least
0
.05
seconds
each
time
.
Trouble
code
indication
mode
Memory
erase
mode
ABS
warning
lamp
GND
(Low
level)
U
U
GND
open
(High
level)
Terminal
6
Ad
.1
.4
1.5
sec
0
.2
sec
or
more
0
.05
sec
or
more
12sec
or
less
B4M0233D
NOTE
:
After
diagnostics
is
completed,
make
sure
to
clear
mem-
ory
.
Make
sureonly
start
code
(11)
is
shown
after
mem-
ory
is
cleared
.
16