Page 33 of 3342
BRAKES
[ABS
5
.3i
TYPE]
[TZBi]
4-4d
2
.
Pre-inspection
B
:
ELECTRICAL
INSPECTION
1
.
WARNING
LIGHT
ILLUMINATION
PATTERN
START
ON
r~
ON
OFF
Ignition
key
switch
Illuminates
.
Goes
out
.
Goes
out
.
ABS
warning
light1.5s
4
111
B4M0781A
1)
When
the
ABS
warning
light
does
not
illuminate
in
accordance
with
this
illumination
pattern,
there
must
be
an
electrical
malfunction
.
2)
When
the
ABS
warning
light
remains
constantly
OFF,
repair
the
ABS
warning
light
circuit
or
diagnosis
circuit
.
.
to
4-4d
[T7A0]
.*10>
NOTE
:
Even
though
the
ABS
warning
light
does
not
go
out
1
.5
seconds
after
it
illuminates,
the
ABS
system
operates
nor-
mally
when
the
warning
light
goes
out
while
driving
at
approximately
12
km/h
(7
MPH)
.
However,
the
Anti-lock
brakes
do
not
work
while
the
ABS
warning
light
is
illumi-
nated
.
3
Page 34 of 3342
4-4d
[Taoo1
BRAKES
[ABS
5
.31
TYPE]
3
.
Electrical
Components
Location
3
.
Electrical
Components
Location
84M
1225A
ABS
control
module
and
hydraulic
control
unit
(ABSCM&H/U)
~2
Proportioning
valve
03
Diagnosisconnector
~4
ABS
warning
light
~5
Data
link
connector
(for
Subaru
select
monitor)
~6
Transmission
control
module
(only
AT
vehicle)
Tone
wheel
%
ABS
sensor
Wheel
cylinder
(*
G
sensor
(only
AWD
vehicle)
~t
Brake
switch
#
Master
cylinder
4
Page 35 of 3342
BRAKES
[ABS
5
.31
TYPE]
[Mo]
4-4d
3
.
Electrical
Components
Location
O
.a
4
.OeF
r~
~
12p
Y1
"
N,
~
'
o~
~~
m
en
.
7
2
1
O
---~
4
~-
)~
134M1226A
134100230D
I
134M0786C
7I
I
~
~
~l
\
°o
i
5
~-~s~v
'
Diag
.
terminal
3
terminal
6
terminal
B4M0646D
1341002311341002
1)
311)
84M06451)
5
Page 36 of 3342
4-4d
[raoo]
BRAKES
[ABS
5
.31
TYPE]
4
.
Schematic
4
.
Schematic
10
14
BATTERY
16
-----I
---
IGN
17
----I
=
O_
.__J
C5
19
U6
--
-
------
H
!
20
-----------
g
10
1
-
~
11
----------
----
r
12
23
`
"
...
.,`
@
.
Twisted
w
ire
B
4M1227A
ABS
control
module
and
hydraulic
control
unit
(ABSCM&H/U)
~2
ABS
control
module
area
~3
Valve
relay
~a
Motor
relay
~5
Motor
06
Front
left
inlet
solenoid
valve
07
Front
left
outlet
solenoid
valve
~8
Front
right
inlet
solenoid
valve
Front
right
outlet
solenoid
valve
~o
Rear
left
inlet
solenoid
valve
Rear
left
outlet
solenoid
valve
g
Rear
right
inlet
solenoid
valve
Rear
right
outlet
solenoid
valve
~a
Transmission
control
module
(only
AT
model)
~5
Diagnosis
connector
~s
Data
link
connector
ABS
warning
light
Qe
Stop
light
switch
Stop
light
~o
G
sensor
(only
AWD
model)
Front
left
ABS
sensor
~2
Front
right
ABS
sensor
Rear
left
ABS
sensor
Rear
right
ABS
sensor
6
Page 37 of 3342
4-4d
[TSOi1
BRAKES
[ABS
5
.31
TYPE]
5
.
Control
Module
I/OSignal
5
.
Control
Module
I/O
Signal
1
.
I/O
SIGNAL
VOLTAGE
ABS
control
moduleand
hydraulic
control
unit
connector
Ell
30000000
00000
Connector
switch
i
F49
1
21314
5
1
6
1
7
1
8
1
9
1
10
1
11
1
12
1
13
1
14
1
15
16
171819
20
2122
232425
26
1
27
1
28
1
29
1
30
1
31
1
84M1228A
NOTE
:
*
The
terminal
numbers
in
the
ABS
control
module
and
hydraulic
control
unit
connector
are
as
shown
in
the
fig-
ure
.
9
When
the
connector
is
removed
from
the
ABSCM&H/U,
the
connector
switchcloses
the
circuit
between
terminal
No
.
21
andNo
.
23
.
The
ABS
warning
light
illuminates
.
8
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