1997 SUBARU LEGACY ABS

BRAKES
[ABS
5
.31
TYPE]
[T7B121
4-4d

7
.
Diagnostics
Chart
for
ABS
Warning
Light
Circuit
and
Diagnosis
Circuit
Failure

7B8
CHECK
PROJECTIONAT
ABSCM&H/U
.

1)
Turn
ignition
switch
to
OFF
.

2)
Check
for
broken
projection
at
the
ABSCM&H/U
termi

nal
.

CHECK
:
Are
the
projection
broken?

,res
:
Go
to
step
7139
.

No
:
Replace
ABSCM&H/U
.

-,
,

00000
~
o
00000
a
oooo1
~oo
oi
"
ooo~~

IIII
`'84M1237A

0

F2

B4M1236A
I

F2

5
4
320
9
1
8
1
7
1
6
1
190
80
7
0
6
~
5
413211

]L

B4M1236A

171319
I
CHECK
ABSCM&H/U
.

Measure
resistance
between
ABSCM&H/U
terminals
.

Terminals

No
.
21
-
No
.
23
:

CHECK
:
Is
the
resistance
more
than
1
MS2?

vES
:
Go
to
step
7810
.

No
:
Replace
ABSCM&H/U
.

7810
CHECK
WIRING
HARNESS
.

Measure
resistance
between
connector
(F2)
and
chassis

ground
.

Connector
&
terminal

(F2)
No
.
9
-
Chassis
ground
:

CHECK
:
Is
the
resistance
less
than0
.5
S2?

vES
:
Go
to
step
7811
.

No
:
Repair
harness
.

7811
CHECK
WIRING
HARNESS
.

1)
Connect
connector
to
ABSCM&H/U
.

2)
Measure
resistance
between
connector
(F2)
and
chas-

sis
ground
.

Connector
&
terminal

(F2)
No
.
9
-
Chassis
ground
:

CHECK
:
Is
the
resistance
more
than
1
MS2?

YES
:
Go
to
step
7812
.

No
:
Repair
harness
.

POOR
CONTACT
IN
ABSCM&H/U
7812

1
CONNECTOR
.
CONNECTOR
.

CHECK
:
Is
there
poor
contact
in
ABSCM&HlU
connec-

tor?
<
Ref
.
to
FOREWORD
[T3C1]
.*10
>

,rES
:
Repair
connector
.

No
:
Replace
ABSCM&H/U
.

27

4-4d
[-nco]
BRAKES
[ABS
5
.31
TYPE]
7
.
Diagnostics
Chart
for
ABS
Warning
Light
Circuit
and
Diagnosis
Circuit
Failure

C
:
TROUBLE
CODE
DOES
NOTAPPEAR
.

DIAGNOSIS
:

9
Diagnosis
circuit
is
open
.

TROUBLE
SYMPTOM
:

*
The
ABS
warning
light
turns
on
or
off
normally
butthe

start
code
cannot
be
read
out
in
the
diagnostic
mode
.

WIRING
DIAGRAM
:

F49
F2
B100

ABS
control
module
and
hydraulic
control
unit
Fuse

No
.
18
Fuse
v
w

c
:
i14
No
.
15

ABS

Combination
meter

oDiagnosis°E
connector

Diagnosis
terminal

B82
8100

11
11
1
1
21
1
31
14
1
1111
1910

i1
1
9
10
11
111
1
2

IGN
sw
SBF-4
FL1
.25B

rw

Q
m

Fuse

No
.19

SBF-3

0

1
4
10111
1

F49

123456789101112131415
16171819
20
2122
2324
25
26
27
1
28
1
29
1
30
1
31
1

84M1230
I

28

BRAKES
LABS
5
.31
TYNCJ
Lncs1
'4-ta

7
.
Diagnostics
Chart
for
ABS
Warning
Light
Circuit
and
Diagnosis
Circuit
Failure

Diagnosisconnector
--J

1-

\~
--~

31

--L
Diagnosis
terminas

S2

B4MOSOOA

7C1
CHECK
DIAGNOSIS
TERMINAL
.

Measure
resistance
between
diagnosis
terminals
(B81)

and
chassis
ground
.

Terminals
Diagnosis
terminal
(A)
-
Chassis
ground
:

Diagnosis
terminal
(B)
-
Chassis
ground
.

E
CHECK
:
Is
the
resistance
less
than
0
.5
fl?

C~
;-E-~s
:
Go
to
step
7C2
.

No
:
Repair
diagnosis
terminal
harness
.

CHECK
DIAGNOSIS
LINE
.

1)
Turn
ignition
switchto
OFF
.

2)
Connect
diagnosis
terminal
to
diagnosis
connector

(B82)
No
.
6
.

3)
Disconnect
connector
from
ABSCM&H/U
.

4)
Measure
resistance
between
ABSCM&H/U
connector

and
chassis
ground
.

Connector
&
terminal

(F49)
No
.
4
-
Chassis
ground
:

CHECK
:
Is
the
resistance
less
than0
.5
S2?

,rES
:
Go
to
step
7C3
.

No
:
Repair
harness
connector
between
ABSCM&H/U

and
diagnosis
connector
.

POOR
CONTACT
IN
ABSCM&H/U
7C3

1
CONNECTOR
.
CONNECTOR
.

CHECK
:
Is
there
poor
contact
in
ABSCM&HI
U
connec-

tor?
<
Ref
.
to
FOREWORD
[T3C1]
.*10
>

vES
:
Repair
connector
.

No
:
Replace
ABSCM&H/U
.

29

4-4a
[TBAO1
BRAKES
[ABS
5
.31
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

8
.
Diagnostics
Chart
with
Trouble
Code

by
ABS
Warning
Light

A
:
LIST
OF
TROUBLE
CODE

Trouble
code
Contents
of
diagnosis
Ref
.
to
11

Start
code

e
Trouble
code
is
shown
afterstart
code
.

*
Only
start
code
is
shown
in
normal
condition
.

-

21
Front
right
ABS
sensor
[T8B0]*10

23
Abnormal
ABS
sensor
Front
left
ABS
sensor
[T8C0]*10

25
(Open
circuit
or
input
voltage
too
high)
Rear
right
ABS
sensor
[T8D0]*10

27
Rear
left
ABS
sensor
[T8E0]x10

22
Front
right
ABS
sensor
[T8F0]*10

24
Front
left
ABS
sensor
[T8G0]dr10

26
Abnormal
ABS
sensor

(Abnormal
ABS
sensor
signal)
Rear
right
ABS
sensor
[T8H0]*10

28
Rear
left
ABS
sensor
[T810]*10

29
Any
one
of
four
[T8J0]*10

31Front
rightinlet
valve
[T8K0]*10

32
Front
right
outlet
valve
[7800]*10

33
Front
left
inlet
valve
[TSLO]*10

34
Abnormal
solenoid
valve
circuit(s)
in
Front
left
outlet
valve
[T8PO]*10

35
ABS
control
module
and
hydraulic
unit
Rear
right
inlet
valve
[T8M0]*10

36Rear
right
outlet
valve
[T8QOj*10

37
Rear
left
inlet
valve
[T8N0]x10

38Rear
left
outlet
valve
[T8R0]*10

41
Abnormal
ABS
control
module
[T8SO1*10

42
Source
voltage
is
abnormal
.
[7870]*10

44
A
combination
of
AT
control
abnormal
[T8U0]t`r10

51
Abnormal
valve
relay
[T8V0]*10

52
Abnormal
motor
and/or
motor
relay
[T8W0]*10

54
Abnormal
stop
light
switch
(78X0]*10

56
Abnormal
G
sensor
output
voltage
[T8Y0)*10

30

4-4d
[rsBO]
BRAKES
[ABS
5
.31
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

B
:
TROUBLE
CODE
21
(FRONT
RH)

C
:
TROUBLE
CODE
23
(FRONT
LH)

D
:
TROUBLE
CODE
25
(REAR
RH)

E
:
TROUBLE
CODE
27
(REAR
LH)

-
ABNORMAL
ABS
SENSOR
(OPEN
CIRCUIT

OR
INPUT
VOLTAGE
TOO
HIGH)
-

DIAGNOSIS
:

"
Faulty
ABS
sensor
(Broken
wire,
input
voltage
too
high)

Faulty
harness
connector

TROUBLE
SYMPTOM
:

*
ABS
does
notoperate
.

WIRING
DIAGRAM
:

F49

ABS
control
module
and
hydraulic
control
unit

OUTBACK
with
steproof
model
B~5
O
O
P8
OO
Ft
100

1
3
1
10
70969
4
78

Rear
ABS
sensor
LH

RearABS
sensor
RH

r----------------
I
OUTBACK
with
steproof
model
I
I
Q
I

RearABS-C~l
sensor
LH

I
I

RearABS
j
~--m
sensor
RH

I
Q
I
------------J

Front
ABS
sensorLH

Front
ABS
sensor
RH

f{9

1
345678911112131415
1116
1
17
1
18
1
19
1
2
0
2
122
4
26
7
1
28
1
29
130131
1

B4M1238

32

BRAKES
[ABS
5
.31
TYPE]
[TSE2]4-4d

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

Except
OUTBACK
model

1
2

D

S2
B4MOSO6E

OUTBACK
model

Front
Rear

1
2
2
1

D

84M
1036C

Except
OUTBACK
model

1
2

-
L
Vq
f
1

B4MO807E

OUTBACK
model

Front
Rear

2
1

D

_v
B4M1037C

$E1
CHECK
ABS
SENSOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABS
sensor
.

3)
Measure
resistance
of
ABS
sensor
connector
terminals
.

Terminal

Front
RH
No
.
1
-
No
.
2
:

Front
LH
No
.
1
-
No
.
2
:

Rear
RH
No
.
1
-
No,
2
:

Rear
LHNo
.
1
-
No
.
2
:

CHECK
:
Is
the
resistance
between
0
.8
and
1
.2
kS2?

,rES
:
Go
to
step
8E2
.

No
:
Replace
ABS
sensor
.

8E2
I
CHECK
BATTERY
SHORT
OF
ABS
SENSOR
.

1)
Disconnect
connector
from
ABSCM&H1U
.

2)
Measure
voltage
between
ABS
sensor
and
chassis

ground
.

Terminal

Front
RH
No
.
1
(+)
-
Chassis
ground
(
)
:

Front
LH
No
.
1
(+)
-
Chassis
ground
(
)
:

Rear
RH
No
.
1
(
+)
-
Chassis
ground
(
)
:

Rear
LH
No
.
1
(+)
-
Chassis
ground
(
)
:

CHECK
:
Is
the
voltage
less
than
1
V?

vES
:
Go
to
step
8E3
.

No
:
Replace
ABS
sensor
.

33

4-4d[T8E3]
BRAKES
[ABS
5
.31
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

Except
OUTBACK
model

M112

L
V
21
B4MOB07E

OUTBACK
model

Front
Rear

1
2
DI
2
1

D

_v
-_
B4M1037C

8E3
I
CHECK
BATTERY
SHORT
OF
ABS
SENSOR
.

1)
Turn
ignition
switch
to
ON
.

2)
Measure
voltage
between
ABS
sensor
and
chassis

ground
.

Terminal

Front
RH
No
.
1
(+)
-
Chassis
ground
(
)
:

Front
LHNo
.
1
(+)
-
Chassis
ground
(
)
:

Rear
RH
No
.
1
(+)
-
Chassis
ground
(-)
:

Rear
LH
No
.
1
(+)
-
Chassis
ground
(
)
:

CHECK
:
Is
the
voltage
less
than
1
V?

vES
:
Go
tostep
8E4
.

No
:
Replace
ABS
sensor
.

ETWEEN
8E4
CHECK

ABSCM&H
U
AND,ABS
SENSOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Connect
connector
to
ABS
sensor
.

3)
Measure
resistance
between
ABSCM&H/U
connector

terminals
.

Connector
&
terminal

Trouble
code
21
/
(F49)
No
.
11
-
No
.
12
:

Trouble
code
23
/
(F49)
No
.
9
-
No
.
10
:

Trouble
code
25
l
(F49)
No
.
14
-
No
.
15
:

Trouble
code
27
l
(F49)
No
.
7
-
No
.
8
:

CHECK
:
Is
theresistance
between
0
.8
and
1
.2
kSZ?

vES
:
Go
to
step
8E5
.

No
:
Repair
harness/connector
between
ABSCM&H/U

and
ABS
sensor
.

34

BRAKES
[ABS
5
.31
TYPE]
[r8E71
4-4d

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

F49

B4M
1240A
'I

f
CHECK
BATTERY
SHORT
OF
HARNESS
.

Measure
voltage
between
ABSCM&H/U
connector
and

chassis
ground
.

Connector
&
terminal

Trouble
code
21
I
(F49)
No
.
11
(+)
-
Chassis
ground

Trouble
code
23
l
(F49)
No
.
9
(+)
-
Chassis
ground

Trouble
code
25
l
(F49)
No
.
14
(+)
-
Chassis
ground

Trouble
code
27
/
(F49)
No
.
7
(+)
-
Chassis
ground

(-)
:

CHECK
:
Is
thevoltageless
than
1
V?

ves
:
Go
to
step
8E6
.

No
:
Repair
harness
between
ABSCM&H/U
and
ABS

sensor
.

18E6
I
CHECK
BATTERY
SHORT
OFHARNESS
.

1)
Turn
ignition
switch
to
ON
.

2)
Measure
voltage
between
ABSCM&H/U
connector
and

chassis
ground
.

Connector
&
terminal

Trouble
code
21
/
(F49)
No
.
11
(+)
-
Chassis
ground

Trouble
code
23
l
(F49)
No
.
9
(+)
-
Chassis
ground

Trouble
code
25
l
(F49)
No
.
14
(+)
-
Chassis
ground

Trouble
code
27
/
(F49)
No
.
7
(+)
-
Chassis
ground

CHECK
:
Is
the
voltage
less
than
1
V?

ves
:
Go
to
step
8E7
.

No
:
Repair
harness
between
ABSCM&H/U
and
ABS

sensor
.

8E7
CHECK
INSTALLATION
OF
ABS
SENSOR
.

Tightening
torque
:

32
f
10
N~m
(3
.3
f
1
.0
kg-m,
24
f
7
ft-Ib)

CHECK
:
Are
the
ABS
sensor
installation
bolts
tight-

ened
securel
y?

vES
:
Go
to
step
8E8
.

No
:
Tighten
ABS
sensor
installation
bolts
securely
.

35