1997 SUBARU LEGACY ABS

BRAKES
[ABS
5
.31
TYPE]
[T1
0Z2]
4-4d
10
.
Diagnostics
Chart
withSelect
Monitor

1021
CHECK
BATTERY
SHORT
OF
HARNESS

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
two
connectors
from
AT
control
module
.

3)
Disconnect
connector
from
ABSCM&H/U
.

4)
Measure
voltage
between
ABSCM&H/U
connector
and

chassis
ground
.

Connector
&
terminal

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

CHECK
:
Is
the
voltage
less
than
1
V?

,rES
:
Go
to
step
1022
.

No
:
Repair
harness
between
AT
control
module
and

ABSCM&H/U
.

CHECK
BATTERY
SHORT
OFHARNESS
.t

1)
Turn
ignition
switch
to
ON
.

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

chassis
ground
.

Connector
&
terminal

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

CHECK
:
Is
the
voltage
less
than
1
V?

Go
to
step
1023
.

No
:
Repair
harness
between
AT
control
module
and

ABSCM&H/U
.

163

4-4d
[T1oza1
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
withSelect
Monitor

I
10Z3
I
CHECK
OPEN
CIRCUIT
OF
HARNESS
.I

1)
Turn
ignition
switch
to
OFF
.

2)
Connect
all
connectors
to
TCM
.

3)
Turn
ignition
switch
to
ON
.

4)
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
13
V?

Go
to
step
1024
.

No
:
Repair
harness/connector
between
TCM
and

ABSCM&H/U
.
1
10Z4
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.I

Turn
ignition
switch
to
OFF
.

CHECK
:
Is
there
poor
contact
in
connectors
between

A
T
control
module
and
ABSCM&H/U?
<
Ref
.

to
FOREWORD
(T3C1]
.*10
>

,res
:
Repair
connector
.

No
:
Go
to
step
1025
.

diagnosis
still
being
output?

0
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
1026
.

10Z5
I
CHECK
ABSCM&HIU
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4)
Read
outthe
trouble
code
.

CHECK
:
!s
the
same
trouble
code
as
in
the
current

1026
CHECK
ANY
OTHER
TROUBLE
CODES

APPEARANCE
.

CHECK
:
Are
other
trouble
codes
being
output?

.rES
:
Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporary
poor
contact
.

164

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

10
.
Diagnostics
Chart
with
Select
Monitor

D
"
NEW
51
(FBI)

V
.
RELAY

B4M0968

AA
:
TROUBLE
CODE
51
V
.
RELAY

-
ABNORMAL
VALVERELAY
-

DIAGNOSIS
:

Faulty
valve
relay

TROUBLE
SYMPTOM
:

9
ABS
does
not
operate
.

WIRING
DIAGRAM
:

ABS
control
module
and
hydraulic
control
unit
Fuse
SBF-4

No
.
19
Valve
relay
F49

F2
8100
Fuse
IGNsw
SBF-4
FL1
.258

Motor
d
I
No
.18
vv
~
relay
l-

r
w
Qm

Solenoid
valve

FL
inlet

FL
outlet

FR
inlet

FR
outlet

RL
inlet

RL
outlet

RR
inlet

RR
outlet

Pump
motor

M

E

1~
F49

123456789101112131415
46
~
~
16111819
20
2122
23242526
1
11
1
12
1
13
11
4
1
51
1
61
1
71
1
81
1
912
0
1
2728293031

84M1253

166

BRAKES
[ABS
5
.3i
TYPE]
[T10AA3]
4-4d

10
.
Diagnostics
Chart
with
Select
Monitor

F49

1
1
2
1
3
1415
1
6
1
7
1
8
9
01112131415
~I61718192
21
23
4
1
2526
1281261301311

LeRVI
B4M1254A

a

112131415161718
9l101111121131141151
11611711811912
1_~23
1
242526
728293031

D
n

SL
f
B4M1243A

1
10AA1
I
CHECK
INPUT
VOLTAGE
OF
ABSCM&H/U
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABSCM&H/U
.

3)
Run
the
engine
atidle
.

4)
Measure
voltage
between
ABSCM&H/U
connector
and

chassis
ground
.

Connector
&
terminal

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

(F49)
No
.
24
(+)
-
Chassis
ground
(-)
:

CHECK
:
Is
thevoltage
between
10
V
and
15
V?

,rES
:
GO
t0
step
10AA2
.

No
:
Repair
harness
connector
between
battery
and

ABSCM&H/U
.
I
10AA2
I
CHECK
GROUND
CIRCUIT
OF
ABSCM&HIU
.

1)
Turn
ignition
switchto
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
SZ?

0
:
Go
to
step
10AA3
.

No
:
Repair
ABSCM&H/U
ground
harness
.
I
10AA3
I
CHECKPOOR
CONTACT
IN
CONNECTORS
.
I

CHECK
:
Is
there
poor
contact
in
connectors
between

generator,
battery
and
ABSCM&HlU?
<
Ref
.

to
FOREWORD
[T3C1]
.*10>

vES
:
Repair
connector
.

No
:
Go
tostep
10AA4
.

167

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

10
.
Diagnostics
Chart
withSelect
Monitor

J
10AA4
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?

ves
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
10AA5
.

10AA5
CHECK
ANY
OTHER
TROUBLE
CODES
APPEARANCE
.

CHECK
;
Are
other
trouble
codes
being
output?

,rES
:
Proceed
with
thediagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporary
poor
contact
.

168

4-4d
[ryonBO1
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
withSelect
Monitor

D~NEW
51
(FBI)

V
.RELAY
ON

B4M0802

AB
:
TROUBLE
CODE
51
V
.
RELAY
ON

-
VALVE
RELAY
ON
FAILURE
-

DIAGNOSIS
:

Faulty
valve
relay

TROUBLE
SYMPTOM
:

*
ABS
does
not
operate
.

WIRING
DIAGRAM
:

ABS
control
module
and
hydraulic
control
unit
Fuse
SBF-4

w-
No
.19

Valve
b
relay
~
F49

0
8100
Fuse
IGN
sw
SBF-4
FL1.258

Motor
No
.18v
~v
relay

w
Qm

Solenoid
valve

FL
inlet

FL
outlet

FR
inlet

FR
outlet

RL
inlet

RL
outlet

RR
inlet

RR
outlet

Pump
motor

M

E

F49

1234567891011113141
1
it
i
~-
76819309
;0
122
23
24

B4M1253

170

BRAKES
[ABS
5
.31
TYPE]
[T10AB4]
4-4d

10
.
Diagnostics
Chart
withSelect
Monitor

00000
E9
c]['~oo
0000000
000000
1313109
130
e

`"/
II
I
F
I
`'B4M1272A

10AB1
CHECK
VALVERELAY
IN
ABSCM&H/U
.

Measure
resistance
between
ABSCM&H/U
terminals
.

Terminals

No
.
23
(+)
-
No
.
24
(
)
:

CHECK
:
Is
theresistance
more
than
1
MS2?

vES
:
Go
to
step
10AB2
.

No
:
Replace
ABSCM&H/U
.
1
10AB2
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.

Is
there
poor
contact
in
connectors
between

generator,battery
and
ABSCM&HIU?
<
Ref
.

to
FOREWORD
[T3C1]
.*10>

vES
:
Repair
connector
.

No
:
Go
to
step
10AB3
.

10AB3
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
thecurrent

diagnosis
still
being
output?

0
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
10AB4
.

CODES
I10AB4
CHECK
ANY

IAPPEARANCE
.

O
THER
TROUBLE
CODES

CHECK
;
Are
other
trouble
codes
being
output?

Proceed
withthe
diagnosis
corresponding
to
the
trouble
code
.

No
:
A
temporary
poor
contact
.

171

4-4d
[T1oaco1
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
with
Select
Monitor

D
"
NEW
52
(FBI)

M
.
RELAY
OPEN

B4M0969

AC
:
TROUBLE
CODE
52
M
.
RELAY
OPEN

-
OPEN
CIRCUIT
OF
MOTOR
RELAY
-

DIAGNOSIS
:

Faulty
motor

"
Faulty
motor
relay

"
Faulty
harness
connector

TROUBLE
SYMPTOM
:

9
ABS
does
not
operate
.

WIRING
DIAGRAM
:

ABS
control
moduleand
hydraulic
control
unit
SBF-6

100

12131415]
r-n
t0
1
11
11
Z1
1
3114
1
11
61
1
71181
19
1201

f"9

1
3456789111111415
1
16
1
17
1
18
1
19
14
21
1"'1
4
125
U
7
12812
9
13013
1
1

B4M
1255

172