1997 SUBARU LEGACY ABS

BRAKES
[ABS
5,3i
TYPE]
[T10AC3]
4-4d

10
.
DiagnosticsChart
with
Select
Monitor

(~4~)

11
21
3141516171819
110111112113114115
1110171101912012112-
128129301311
23
1
24
1
25
1
26

v
BW
1256A

F49

1
234
5
6
7
8
9
101112131415
61
1819
2
21
26
7
8293
31
23
2425
1

D
n

]L

B4M1257A

10AC1
CHECK
INPUT
VOLTAGEOF
ABSCM&H/U
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABSCM&H/U
.

3)
Turn
ignition
switch
to
ON
.

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

chassis
ground
.

Connector
&
terminal

(F49)
No
.
25
(+)
-
Chassis
ground
(
)
:

CHECK
;
Is
the
voltage
between
10
V
and
13
V?

Go
to
step
10AC2
.

No
:
Repair
harness/connector
between
battery
and

ABSCM&H/U
and
check
fuse
SBF6
.
1
10AC2
I
CHECK
GROUND
CIRCUIT
OF
MOTOR
.
I

1)
Turn
ignition
switch
to
OFF
.

2)
Measure
resistance
between
ABSCM&H/U
connector

and
chassis
ground
.

Connector
&
terminal

(F49)
No
.
26
-
Chassis
ground
:

CHECK
:
Is
theresistance
less
than0
.5
S2?

,rES
:
Go
to
step
10AC3
.

No
:
Repair
ABSCM&H/U
ground
harness
.

1
10AC3
I
CHECK
MOTOR
OPERATION
.I

Operate
tine
check
sequence
.
<
Ref
.
to
4-4
[W25D1
].
>

NOTE
:

Use
the
diagnosis
connector
to
operate
the
sequence

control
.

Can
motor
revolution
noise
(buzz)
be
heard

when
carrying
out
the
check
sequence?

Go
to
step
10AC4
.

No
:
Replace
ABSCM&H1U
.

173

4-4d
[T1oaca1
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
withSelect
Monitor

10AC4
CHECK
POOR
CONTACT
IN
CONNECTORS
.

Turn
ignition
switch
to
OFF
.

CHECK
:
Is
there
poor
contact
in
connector
between

hydraclic
unit,
relay
boxand
ABSCM&HlU?

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

ves
:
Repair
connector
.

No
:
Go
to
step
10AC5
.
1
10AC5
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
thecurrent

diagnosis
still
being
output?

YES
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
10AC6
.

10AC6
I
CHECK

APPEARANCE

.THER
TROUBLE
CODES

Are
other
trouble
codes
being
output?

Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporarypoor
contact
.

174

4-4d
[r1oaDo1
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
withSelect
Monitor

D
"
NEW
52
(FBI)

M
.
RELAY
ON

B4M0970

AD
:
TROUBLE
CODE
52
M
.
RELAY
ON

-
MOTOR
RELAY
ON
FAILURE
-

DIAGNOSIS
:

Faulty
motor

Faulty
motor
relay

Faulty
harness
connector

TROUBLE
SYMPTOM
:

*
ABS
does
notoperate
.

WIRING
DIAGRAM
:

ABS
control
module
and
hydraulic
control
unit
SBF-6

Valve
relayO
F49

-LL
O
FuseIGN
sw
SBF-4
F1-1
.2513

LL
Motor
No
.
18

relay
`-

w
Qm

Solenoid
valve

FL
inlet

FLoutlet

FR
inlet

FR
outlet

RL
inlet

RL
outlet

RR
inlet

RR
outlet

Pump
motor

M

E

F49
100

1
121
3
1
4
1
5
1
6
1
7
1
8
1
9
1
1
0111
1
1
21
1
3114
1
5
4
161718191021

X
1
11
11
211311
4
1111
~~
d?
7
1
78
17
9
1
30
1
31
1
~56

84M
1255

176

BRAKES
[ABS
5
.31
TYPE]
IT10AD5]
4-4d

10
.
Diagnostics
Chart
with
Select
Monitor

ABSCM&H/U

D
II
f"
---
oo~

i
B4M1270A

10AD1
CHECK
MOTOR
RELAY
IN
ABSCM&H/U
.

Measure
resistance
between
ABSCM&H/U
terminals
.

Terminals

No
.
25
-
No
.
26
:

CHECK
.
:
Is
the
resistance
more
than
1
MSZ?

.
Go
to
step
10AD2
.

No
:
Replace
ABSCM&H/U
.

10AD2
CHECK
MOTOR
OPERATION
.

Operate
the
sequence
control
.
<
Ref
.
to
4-4
[W25D1
]
.
>

CHECK
;
Can
motor
revolution
noise
(buzz)
be
heard

when
carrying
out
the
sequence
control?

Go
to
step
10AD3
.

No
:
Replace
ABSCM&H/U
.
1
10AD3
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.I

Turn
ignition
switch
to
OFF
.

CHECK
:
Is
there
poor
contact
in
connector
between

hydraulic
unit,
relay
box
and
ABSCM&HlU?

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

,rss
:
Repair
connector
.

No
:
Go
to
step
10AD4
.

1
10AD4
I
CHECK
ABSCM&H/U
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4)
Read
outthe
trouble
code
.

diagnosis
stiff
being
output?

YES
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
10AD5
.

CHECK
:
is
the
same
trouble
code
as
in
the
current

10AD5
CHECK
ANY
OTHER
TROUBLE
CODES

1APPEARANCE
.
I

Eck
&
-)
:
Are
other
trouble
codes
being
output?

Proceed
with
thediagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporary
poor
contact
.

177

4-4d
[T1oaEO1
BRAKES
[ABS
5
.3i
TYPE]

10
.
DiagnosticsChart
withSelect
Monitor

D
"
NEW
52
(FBI)

MOTOR

B4M0971

AE
:
TROUBLE
CODE
52
MOTOR

-
ABNORMAL
MOTOR
-

DIAGNOSIS
:

Faulty
motor

Faulty
motor
relay

Faulty
harness
connector

TROUBLE
SYMPTOM
:

o
ABS
does
not
operate
.

WIRING
DIAGRAM
:

ABS
control
module
and
hydraulic
control
unit
SBF-6

Valve
relay
K
fl
:
F49
FZ
800
Fuse
IGN
sw
SBF-4
FL1
.25B

Motor
~
~N°'

relay

rw
am

Solenoid
valve

FL
inlet

FL
outlet

FR
inlet

FR
outlet

RL
inlet

RL
outlet

RR
inlet

RR
outlet
21

Pump
motor

M

E

E

F49
8100

1234567891011111415
4
16171819202122
~
11
121
I
4
11
'51
1
61
1
71
18
1
1
91201
~~
27282930
31
23
4
25
26

B4M1255

178

BRAKES
[ABS
5
.3i
TYPE]
(T10AE2]
4-4d

10
.
Diagnostics
Chart
with
Select
Monitor

(~4~)

11
21
3141516171819
1101111121131141151
11161171181191202112
12812913W11
23
1
24
1
26

v
B4MI256A

r-A
1121314151617181911011111211311
51
1617
8192
21
23
2425
26
728293031

D
n

5C

B4M
1257A

10AE1
CHECK
INPUT
VOLTAGEOF
ABSCM&H/U
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABSCM&H/U
.

3)
Turn
ignition
switch
to
ON
.

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

chassis
ground
.

Connector
&
terminal

(F49)
No
.
25
(+)
-
Chassis
ground
(
)
:

CHECK
:
Is
thevoltage
between
10
V
and
13
V?

,rES
:
Go
to
step
10AE2
.

No
:
Repair
harness/connector
between
battery
and

ABSCM&H/U
and
check
fuse
SBF6
.

10AE2
I
CHECK
GROUND
CIRCUIT
OF
MOTOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Measure
resistance
between
ABSCM&H/U
connector

and
chassis
ground
.

Connector
&
terminal

(F49)
No
.
26
-
Chassis
ground
:

CHECK
:
Is
the
resistance
less
than0
.5
SZ?

,rES
:
Go
to
step
10AE3
.

No
:
Repair
ABSCM&H/U
ground
harness
.

179

4-4d
[TyoAE3l
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
withSelect
Monitor
F49

D

P)
V
44-
84M1234A
I

F49

1
1
2
3
1
4
1
5
1
6
1
7
1
89
101112131415
1
16
1
17
1
18
1
19
1
2
01
21
12-
L-12
7
12
8
1
2
00
31
1
2324
2526

1L
B4M
1243A

I10AE3]CHECK
INPUT
VOLTAGE
OF
ABSCM&HIU
.

1)
Run
the
engine
at
idle
.

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

chassis
ground
.

Connector
&
terminal

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

CHECK
:
Is
thevoltage
between
10
V
and
15
V?

YES
:
Go
to
step
10AE4
.

No
:
Repair
harness
connector
between
battery,igni-
tion
switch
and
ABSCM&H/U
.
1
10AE4
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
fl?

Go
to
step
10AE5
.

No
:
Repair
ABSCM&H/U
ground
harness
.

10AE5
CHECK
MOTOR
OPERATION
.

Operate
the
sequence
control
.
<
Ref
.
to
4-4
[W25D1
]
.
>

NOTE
:

Use
the
diagnosis
connector
to
operate
the
sequence

control
.

CHECK
:
Can
motor
revolution
noise
(buzz)
be
heard

when
carrying
outthe
sequence
control?

,rES
:
Go
to
step
10AE6
.

No
:
Replace
hydraulic
unit
.

180

BRAKES
[ABS
5
.31
TYPE]
[T10AE8]
4-4d

10
.
DiagnosticsChart
with
Select
Monitor

1
10AE6
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.

Turn
ignition
switch
to
OFF
.

CHECK
:
Is
there
poor
contact
in
connector
between

generator,
battery
and
ABSCM&HIU?
<
Ref
.

to
FOREWORD
[T3C1]
.*10
>

0
:
Repair
connector
.

No
:
Go
to
step
10AE7
.
1
10AE7
J
CHECK
ABSCM&HlU
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4)
Read
out
the
trouble
code
.

K
:
Is
the
same
trouble
code
as
in
thecurrent

diagnosis
still
being
output?

,rES
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
10AE8
.

10AE8
CHECK
ANY
OTHER
TROUBLE
CODES

APPEARANCE
.

CHECK
:
Are
other
trouble
codes
being
output?

Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporary
poor
contact
.

181