1997 SUBARU LEGACY ABS

4-4d
[TSTO1
BRAKES
[ABS
5
.31
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

T
:
TROUBLE
CODE
42

-
SOURCE
VOLTAGE
IS
ABNORMAL
.
-

DIAGNOSIS
:

9
Power
source
voltage
of
the
ABSCM&H/U
is
low
or
high
.

TROUBLE
SYMPTOM
:

*
ABS
does
notoperate
.

WIRING
DIAGRAM
:

F49
SBF-4
FL1.25B

ABS
control
module
and
hydraulic
control
unit

F2
8100
IGN
sw
No

Fuse

8100
F49

12345678910111131415

1
1
2
1
3
1
4
151
16171819
20
2122
23
24
2526
1
11
1
12
1
13
1
14
11
51
16~
2128
2930
31

B4M1245

66

Generator

BRAKES
[ABS
5
.3i
TYPE]
[T8T3]
4-4Q

8
.
DiagnosticsChart
with
Trouble
Code
by
ABS
Warning
Light

\
7<
1

o

~
-
%mnn>>fl
5

B4M0430

F49

1
234
5
6
7
819
110111112113114115

4
1
18
22112
W23193123
1
24
1
25
1
26

L
F
a=--]

V

B4M1234A

18T1
I
CHECKGENERATOR
.

1)
Start
engine
.

2)
Idling
after
warm-up
.

3)
Measure
voltage
between
generator
B
terminal
and

chassis
ground
.

Terminal

Generator
B
terminal
-
Chassis
ground
:

CHECK
:
Is
thevoltage
between
10
V
and
17
V?

Go
to
step
8T2
.

No
:
Repair
generator
.

8T2
CHECK
BATTERY
TERMINAL
.

Turn
ignition
switch
to
OFF
.

CHECK
:
Are
the
positive
and
negative
battery
termi-

nals
tightly
clamped?

ves
:
Go
to
step
8T3
.

No
:
Tighten
the
clamp
of
terminal
.

8T3
CHECK
INPUT
VOLTAGE
OF
ABSCM&H/U
.

1)
Disconnect
connectorfrom
ABSCM&H/U
.

2)
Run
the
engine
at
idle
.

3)
Measure
voltage
between
ABSCM&H/U
connector
and

chassis
ground
.

Connector
&
terminal

(F49)
No
.
1
(+)
-
Chassis
ground
(
)
:

CHECK
:
Is
thevoltage
between
10
V
and
17
V?

YES
:
Go
to
step
8T4
.

No
:
Repair
harness
connector
between
battery,
igni-

tion
switch
and
ABSCM&H/U
.

67

4-4d
[T8T4l
BRAKES
[ABS
5
.31
TYPE]
8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

(~~O

a

1
23
4
567
819110111112113114115
16171819
2
1
23
2425
26
7
1281
2
91

]C
-_
84M1243A

$T4
I
CHECK
GROUND
CIRCUIT
OF
ABSCM&H/U
.

1)
Turn
ignition
switch
to
OFF
.

2)
Measure
resistance
between
ABSCM&H/U
connector

and
chassis
ground
.

Connector
&
terminal

(F49)
No
.
23
-
Chassis
ground
:

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

vES
:
Go
to
step
8T5
.

No
:
Repair
ABSCM&H/U
ground
harness
.

CHECKPOOR
CONTACT
IN
CONNECTORS
.I

Is
there
poor
contact
in
connectors
between

generator,
battery
and
ABSCM&HIU?
<
Ref
.

to
FOREWORD
[T3C1]
.*10
>

Repair
connector
.

No
:
Go
to
step
8T6
.

18T6
i
CHECK
ABSCM&HIU
.

1)
Connect
ail
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4)
Read
outthe
trouble
code
.

diagnosis
still
being
output?

,mss
:
Replace
ABSCM&H/U
.

No
:
Go
tostep
8T7
.

CHECK
;
Is
the
same
trouble
code
as
in
thecurrent

CHECK
ANY
OTHER
TROUBLE
CODES

APPEARANCE
.

CHECK
:
Are
other
trouble
codes
being
output?

Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporarypoor
contact
.

68

4-4d
[rsuo1
BRAKES
[ABS
5
.3i
TYPE]

8
.
DiagnosticsChart
with
Trouble
Code
by
ABS
Warning
Light

U
:
TROUBLE
CODE
44

-
A
COMBINATION
OF
AT
CONTROL

ABNORMAL
-

DIAGNOSIS
:

a
Combination
of
AT
control
faults

TROUBLE
SYMPTOM
:

e
ABS
does
not
operate
.

WIRING
DIAGRAM
:

F49

ABS
control
module
and
hydraulic
control
unit
ILE

Fuse
IGN
sw
SBF-4
FL]
.25B

No
.16

F45
B62
B54

m

O
JE

Transmission
control
module

X100
B56

854
B55856

1
3
4
6
P11213149
1
49
10
1
11
11
141
1
11
211311411
tl
1611
/11

F49

123456789101112131415
2122
23
242
5
26
617W031
2171
8
2

8100

f45

'1
14
1

B4M
1247

70

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

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

`L/

Tn
Mark
1
h
.I
t,~
\
;d

ABSCM&HlU
B4M
1248A

181
.11
I
CHECK
SPECIFICATIONS
OF
THE
ABSCM
.

Check
specifications
of
the
mark
to
the
ABSCM&H/U
.

Mark
Model

C3
AWD
AT

C4
AWD
MT

CHECK
:
Is
an
ABSCM&H/U
for
AT
model
installed
on

a
MT
model?

,res
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
81
.12
.

$U2
CHECK
GROUND
SHORT
OF
HARNESS
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
two
connectors
from
TCM
.

3)
Disconnect
connector
from
ABSCM&H/U
.

4)
Measure
resistance
between
ABSCM&H/U
connector

and
chassis
ground
.

Connector
&
terminal

(F49)
No
.
3
-
Chassis
ground
:

CHECK
:
Is
theresistance
more
than1
MS2?

ves
:
Go
to
step
8U3
.

No
:
Repair
harness
between
TCM
and
ABSCM&H/U
.

181
.13
CHECK
BATTERY
SHORT
OF
HARNESS
.

Measure
voltage
between
ABSCM&H/U
connector
and

chassis
ground
.

Connector
&
terminal

(F49)
No
.
3
(+)
-
Chassis
ground
(
)
:

CHECK
;
Is
thevoltage
less
than
1
V?

YES
:
Go
to
step
8U4
.

No
:
Repair
harness
between
TCM
and
ABSCM&H/U
.

71

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

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

B56

1
1
01
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
11
111
.
1211

L

0

V

B4M
1251
A

8U4
CHECK
BATTERY
SHORT
OF
HARNESS
.

1)
Turn
ignition
switch
to
ON
.

2)
Measure
voltage
between
ABSCM&HlU
connector
and

chassis
ground
.

Connector
&
terminal

(F49)
No
.
3
(+)
-
Chassis
ground
(-)
:

CHECK
:
Is
thevoltagelessthan
1
V?

Go
to
step
811
.115
.

No
:
Repair
harness
between
TCM
and
ABSCM&H/U
.

8U5
CHECK
TCM
.

1)
Turn
ignition
switch
to
OFF
.

2)
Connect
all
connectors
to
TCM
.

3)
Turn
ignition
switch
to
ON
.

4)
Measure
voltage
between
TCM
connector
terminal
and

chassis
ground
.

Connector
&
terminal

(B56)
No
.
5
(+)
-
Chassis
ground
(
)
:

CHECK
:
Is
the
voltage
between
10
V
and
15
V?

Go
tostep
8U7
.

Go
tostep
SU6
.

$U6
I
CHECK
AT
.

!s
the
AT
functioning
normally?

,rES
:
Replace
TCM
.

No
:
Repair
AT
.

72

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

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

CHECK
OPEN
CIRCUIT
OF
HARNESS
.

Measure
voltage
between
ABSCM&H/U
connector
and

chassis
ground
.

Connector
&
terminal

(F49)
No
.
3
(+)
-
Chassis
ground
(
)
:

(F49)
No
.
31
(+)
-
Chassis
ground
(
)
:

CHECK
;
Is
thevoltage
between
10
V
and
15
V?

,rES
:
Go
to
step
81
.18
.

No
:
Repair
harness/connector
between
TCM
and

ABSCM&H/U
.

181
.18
1
CHECK
POOR
CONTACT
IN
CONNECTORS
.I

CHECK
:
Is
there
poor
contact
in
connectors
between

TCM
and
ABSCM&H/U?
<
Ref,
to
FORE-

WORD
[T3C1]
.*10
>

YES
:
Repair
connector
.

No
:
Go
to
step
8U9
.

I
8U9CHECK
ABSCM&H/U
.

1)
Turn
ignition
switchto
OFF
.

2)
Connect
all
connectors
.

3)
Erase
the
memory
.

4)
Perform
inspection
mode
.

5)
Read
out
the
trouble
code
.

CHECK
:
Is
the
same
trouble
code
as
in
the
current

diagnosis
still
being
output?

0
:
Replace
ABSCM&H/U
.

no
:
Go
to
step
81
.110
.

O
CHECK
ANY

I
APPEARANCE
.

O
THER
TROUBLE
CODES

Are
othertrouble
codes
being
output?

Proceed
with
the
diagnosiscorresponding
to
the

trouble
code
.

No
:
A
temporary
poor
contact
.

~3

4-4d
[TSVO1
BRAKES
[ABS
5
.31
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

V
:
TROUBLE
CODE
51

-
ABNORMAL
VALVERELAY
-

DIAGNOSIS
:

Faulty
valve
relay

TROUBLE
SYMPTOM
:

*
ABS
does
notoperate
.

WIRING
DIAGRAM
:

ABS
control
module
and
hydraulic
control
unit
Fuse
SBF-4

t

No
.
19

Valve
relay
~
F4
Lk
9

F2
8100
Fuse
IGN
sw
SBF-4
FL1.25B

Motor
~
O
No
.18
relay

r

w
m

Solenoid
valve

FL
inlet

FL
outlet

FR
inlet

FR
outlet

RL
inlet

RL
outlet

RR
inlet

RR
outlet

Pump
motor

M

E

100
f49

1234567891011113141
4
16171819202122
23
24
52
X
11
1
14
1
181
~
~
q
27
12
8
1
29
1
30
1
31
1

84M1253

74