1997 SUBARU LEGACY ABS

BRAKES
[ABS
5
.31
TYPE]
IT8N3I4-4d

8
.
DiagnosticsChart
with
Trouble
Code
by
ABS
Warning
Light

819
11
Oil
111
21131141

4

161171181191212112
9
23
24
25
26
1
2
81
2
1301
31
1

F=_1

V
B4
M
1234A

F49

1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
101112131415
11
16
1
17
1
18
1
19
1
2
01
212
23
24
25
26
L-~
7
1
28
1
2001
11

]L
COO
B4M
1243A

$N1
I
CHECK
INPUT
VOLTAGE
OF
ABSCM&H/U
.

1)
Disconnect
connector
from
ABSCM&H/U
.

2)
Run
theengine
at
idle
.

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

chassis
ground
.

Connector
&
terminal

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

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

,rES
:
Go
tostep
8N2
.

No
:
Repair
harness
connector
between
battery,
igni-

tion
switch
and
ABSCM&H/U
.

$N2
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
S2?

Go
to
step
8N3
.

No
:
Repair
ABSCM&H/U
ground
harness
.

$N3
I
CHECKPOOR
CONTACT
IN
CONNECTORS
.

Is
there
poor
contact
in
connectors
between

generator,
battery
and
ABSCM&HlU?
<
Ref
.

to
FOREWORD
[T3C1]
.*10
>

YES
:
Repair
connector
.

No
:
Go
to
step
8N4
.

55

4-4d
R8N41
BRAKES
[ABS
5
.31
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

8N4
I
CHECK
ABSCM&H/U
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4)
Read
out
the
trouble
code
.

CHECK
:
Is
the
same
trouble
code
as
in
the
current

diagnosis
still
being
output?

Replace
ABSCM&H/U
.

No
:
Go
to
step
8N5
.

8NS
CHECK
ANY

APPEARANCE

.THER
TROUBLE
CODES

CHECK
:
Are
other
trouble
codes
being
output?

0
:
Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

n~o
:
A
temporary
poor
contact
.

56

4-4d
tTSOO1
BRAKES
[ABS
5
.31
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Codeby
ABS
Warning
Light

O
:
TROUBLE
CODE
32
(FRONT
RH)

P
:
TROUBLE
CODE
34
(FRONT
LH)

Q
:
TROUBLE
CODE
36
(REAR
RH)

R
:
TROUBLE
CODE
38
(REAR
LH)

-
ABNORMAL
OUTLET
SOLENOID
VALVE

CIRCUIT(S)
IN
ABSCM&H/U
-

DIAGNOSIS
:

Faulty
harness/connector

"
Faulty
outlet
solenoid
valve
in
ABSCM&H/U

TROUBLE
SYMPTOM
:

*
ABS
does
not
operate
.

WIRING
DIAGRAM
:

F49
SBF-4
FL1
.258

ABS
control
module
and
hydraulic
control
unit

f2
8100
IGN
sw
Fuse

No
.18

8100
f49

1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
1
10
1
11
11
21
1
1415
1,
H3
46
16111819
20
2122
111213141516
11
/1
18
1
19
1
2
01
10
q271281291301311
23
2425
26~

sannizas
I

58

Generator

BRAKES
[ABS
5
.31
TYPE]
[T8R3]
4-4d

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

F49

1
1
213
1
4
1
5
1
6
1
7
1
8
9
1
10
1
11
1
12
1
131
415
1
16
1
17
1
18
1
19
1
2
21
23
242526
728293031
1

D
~

]LB4M1243A

181111
1
CHECK
INPUT
VOLTAGEOF
ABSCM&H/U
.

1)
Disconnect
connector
from
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
15V?

,rES
:
Go
to
step
8112
.

No
:
Repair
harness
connector
between
battery,igni-
tion
switch
and
ABSCM&H/U
.

181112
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
than0
.5
S2?

Go
to
step
8R3
.

No
:
Repair
ABSCM&H/U
ground
harness
.

18113
1
CHECK
POOR
CONTACT
IN
CONNECTORS
.

Is
there
poor
contact
in
connectors
between

generator,
battery
and
ABSCM&HIU?
c
Ref
.

to
FOREWORD
[T3C1
]
.*10
>

,rES
:
Repair
connector
.

No
:
Go
to
step
8114
.

59

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

1
8R4
I
CHECK
ABSCM&H/U
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4}
Read
outthe
trouble
code
.

Is
the
same
trouble
code
as
in
thecurrent

diagnosis
still
being
output?

,rES
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
81145
.

8R5
CHECK
ANY
OTHER
TROUBLE
CODES

APPEARANCE
.

Are
other
trouble
codes
being
output?

Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

A
temporary
poor
contact
.

60

4-4d
ITBSO1
BRAKES
[ABS
5
.31
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

S
:
TROUBLE
CODE
41

-
ABNORMAL
ABSCONTROL
MODULE
-

DIAGNOSIS
:

9
Faulty
ABSCM&H/U
.

TROUBLE
SYMPTOM
:

9
ABS
does
not
operate
.

WIRING
DIAGRAM
:

F49

ABS
control
module
and
hydraulic
control
unit
E

F49

123456789101112131415

16171819
20
2122
23
242526
2728293031

B4M1246

62

BRAKES
[ABS
5
.31
TYPE]
Rsss1
4-4d

8
.
DiagnosticsChart
with
Trouble
Code
by
ABS
Warning,Light

M

1
23
45
6
718
1101111121131141151
1116117118119121211
'9t,-73
24-
2526
71281203*
01311111

B4M1243A

8S1
CHECK
GROUND
CIRCUIT
OF
ABSCM&H/U
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABSCM&H/U
.

3)
Measure
resistance
between
ABSCM&H/U
and
chassis

ground
.

Connector
&
terminal

(F49)
No
.
23
-
Chassis
ground
:

CHECK
;
Is
the
resistance
less
than
0
.5
0?
Go
to
step
8S2
.

No
:
Repair
ABSCM&H/U
ground
harness
.

8S2
CHECKPOOR
CONTACT
IN
CONNECTORS
.

CHECK
:
Is
there
poor
contact
in
connectors
between

battery,ignition
switch
and
ABSCM&HlU?

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

vES
:
Repair
connector
.

No
:
Go
tostep
8S3
.

8S3
CHECK
SOURCES
OF
SIGNAL
NOISE
.

CHECK
:
Is
thecar
telephone
orthe
wireless
transmit-

ter
properly
installed?

,rES
:
Go
to
step
8S4
.

No
:
Properly
install
thecar
telephone
or
the
wireless

transmitter
.

8S4
CHECK
SOURCES
OFSIGNAL
NOISE
.

CHECK
;
Are
noise
sources
(such
asan
antenna)

installed
near
the
sensorharness?

,rES
:
Install
the
noise
sources
apartfrom
the
sensor

harness
.

No
:
Go
to
step
8S5
.

8S5
I
CHECK
ABSCM&HIU
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4)
Read
out
the
trouble
code
.

CHECK
:
Is
the
same
trouble
code
as
in
thecurrent

diagnosis
still
being
output?

Replace
ABSCM&H/U
.

No
:
Go
to
step
8S6
.

63

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

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

8S6
CHECK
ANY

I
APPEARANCE

.THER
TROUBLE
CODES

CHECK
:
Are
other
trouble
codes
being
output?

,rES
:
Proceed
with
thediagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporary
poor
contact
.

64