1997 SUBARU LEGACY ABS

BRAKES
[ABS
5
.31
TYPE]
[T10D5]
4-4d

10
.
Diagnostics
Chart
with
Select
Monitor

00000
~
oooii
00000
n
0000^JO~001
'00

(III
`'B4M1237A

B4M1236A
I

F2

9
1817161
54
3
2
l
9
B
7
6543
211
~

84M
1236A

1ODII
I
CHECK
WIRING
HARNESS
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
(F2)
from
connector
(B100)
.

3)
Turn
ignition
switch
to
ON
.

CHECK
:
Does
the
ABS
warning
light
remain
off?

Go
to
step
10132
.

No
:
Repair
front
wiring
harness
.

10D2
CHECK
PROJECTION
AT
ABSCM&H/U
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABSCM&H/U
.

3)
Check
for
broken
projection
at
the
ABSCM&H/U
termi-

nal
.

CHECK
:
Are
the
projection
broken?

Go
to
step
103
.

No
:
Replace
ABSCM&H/U
.
1
10D3
I
CHECKABSCM&H/U
.

Measure
resistance
between
ABSCM&H/U
terminals
.

Terminals

No
.
21
-
No
.
23
:

!s
the
resistance
more
than
1
MS2?

Go
to
step
1101134
.

No
:
Replace
valve
relay
.
1
10134
1
CHECK
WIRING
HARNESS
.
I

Measure
resistance
between
connector
(F2)
and
chassis

ground
.

Connector
&
terminal

(F2)
No
.
9
-
Chassis
ground
:

is
the
resistance
less
than
0
.5
S2?

Go
to
step
10135
.

o
:
Repair
harness
.
1
10D5
I
CHECK
WIRING
HARNESS
.
I

1)
Connect
connector
to
ABSCM&H/U
.

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

sis
ground
.

Connector
&
terminal

(F2)
No
.
9
-
Chassis
ground
:

Is
the
resistance
more
than
1
mil?

Go
tostep
10D6
.

Repair
harness
.

109

F2
.

4-4d
[T1
011361
BRAKES
[ABS
5
.3i
TYPE]
10
.
Diagnostics
Chart
withSelect
Monitor

1016
CHECK

I

POO

CONNECTOR

R
CONTACT
IN
ABSCM&H/U

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

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

ves
:
Repair
connector
.

No
:
Replace
ABSCM&H/U
.

110

4-4d
[T10E0]
BRAKES
[ABS
5
.3i
TYPE]

10
.
Diagnostics
Chart
withSelect
Monitor

D
"
NEW
21
(FBI)

F
R
.
SS
HARD

B4M0945

D
"
NEW
23
(FBI)

FL
.
SS
HARD

84M0946

D
"
NEW
25
(FBI)

RR
.
S
S
HARD

B4M0947

D
"
NEW
27
(FBI)

RL
.SS
HARD

84M0948

E
:
TROUBLE
CODE
21
FR
.
SS
HARD

-
ABNORMAL
FRONT
RH
ABS
SENSOR

(OPEN
CIRCUIT
OR
INPUT
VOLTAGE
TOO

HIGH)
-

F
:
TROUBLE
CODE
23
FL
.
SS
HARD

-
ABNORMAL
FRONT
LH
ABS
SENSOR

(OPEN
CIRCUIT
OR
INPUT
VOLTAGE
TOO

HIGH)
-

G
:
TROUBLE
CODE
25
RR
.
SS
HARD

-
ABNORMAL
REAR
RH
ABS
SENSOR
(OPEN

CIRCUIT
OR
INPUT
VOLTAGE
TOO
HIGH)
-

H
:
TROUBLE
CODE
27
RL
.
SS
HARD

-
ABNORMAL
REAR
LH
ABS
SENSOR
(OPEN

CIRCUIT
OR
INPUT
VOLTAGE
TOO
HIGH)
-

112

BRAKES
[ABS
5
.31
TYPE]
[T10H0]
4-4d

10
.
Diagnostics
Chart
with
Select
Monitor

DIAGNOSIS
:

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

Faulty
harness
connector

TROUBLE
SYMPTOM
:

9
ABS
does
not
operate
.

WIRING
DIAGRAM
:

F49

ABS
control
module
and
hydraulic
control
unit

OUTBACK
with
step
roof
model
Bt5
O

O
P8
O
P8

[ft
LwI

O
8100

815

Front
ABS
sensorLH

Front
ABS
sensor
RH
Twisted
wire
Ft
Pt
OO

WEB
i
Twisted
wire

W
EB-

(2D

F1
100

F
172
-1
F3
1
F
U=
10
1
4
15161
7
1
8

Rear
ABS
sensor
LH

RearABS
sensor
RH

t
OUTBACK
with
step
roof
model
III

Rear
ABS
sensor
LH

j
~
RearABS
j
7
sensor
RH

I
~
I
L---------------J

F49

12345678910111131415
1
16
1
17
1
18
1
19
111
202122
23
4
252627
1
28
1
29
001
31

B4M1238

113

4-4d
[T1oHyl
BRAKES
[ABS
5
.3i
TYPE]

10
.
Diagnostics
Chart
with
Select
Monitor

FR
(F05)

30
km/h

B4M0922

I1
0H1
(CHECK
OUTPUT

SELECT
MONITORF

ABS
SENSOR
USING

Read
the
ABS
sensoroutput
corresponding
to
the
faulty

system
in
the
select
monitor
function
mode
.

NOTE
:

The
select
monitor
display
shows
that
the
front
right
wheel

is
rotating
at
30km/h
.

CHECK
:
Does
the
speed
indicated
on
the
display

change
in
response
to
the
speedometer

reading
during
acceleration/deceleration

when
the
steering
wheel
isin
the
straight-

ahead
position?

YES
:
Go
to
step
10H2
.

No
:
Go
to
step
10H9
.

1OH2
I
HECK
INSTALLATION
OF
ABS
SENSOR
.

Tighteningtorque
:

32
f
10
N~
m
(3.3
f
1
.0
kg-m,
24
±
7
ft-Ib)

CHECK
:
Are
the
ABS
sensor
installation
bolts
tight-

ened
securely?

,rES
:
Go
to
step
10H3
.

No
:
Tighten
ABS
sensor
installation
bolts
securely
.

10H3
I
CHECK
INSTALLATION
OFTONE
WHEEL
.

Tightening
torque
:

13±3
N~m
(1
.3±0
.3
kg-m,
9±2
.2
ft-Ib)

CHECK
:
Are
the
tone
wheel
installation
bolts
tight-

ened
securely?

ves
:
Go
to
step
10H4
.

No
:
Tightentone
wheel
installation
bolts
securely
.

114

BRAKES
[ABS
5
.31
TYPE]
[T10H7]
4-4d

10
.
Diagnostics
Chart
with
Select
Monitor

G4M0700

G4M0701

I
OH4
CHECK
ABS
SENSOR
GAP
.

Measure
tone
wheel-to-pole
piece
gap
over
entire
perim-

eterof
the
wheel
.

CHECK
:
Is
the
gap
within
the
specifications
shown
in

the
following
table?

Front
wheel
Rear
wheel

Specifications
0
.9
-
1
.4
mm

(0
.035
-
0
.055
in)

0
.7
-
1.2
mm

(0
.028
-
0
.047
in)

,rES
:
Go
to
step
10H5
.

No
:
Adjust
the
gap
.

NOTE
:

Adjust
the
gap
using
spacers
(Part
No
.
26755AA000)
.
If

spacers
cannot
correct
the
gap,
replace
worn
sensor
or

worn
tone
wheel
.

10H5
CHECK
HUB
RUNOUT
.

Measure
hub
runout
.

CHECK
:
Is
the
runout
less
than0
.05
mm
(0
.0020
in)?

Go
to
step
10H6
.

No
:
Repair
hub
.

10H6
I
CHECKPOOR
CONTACT
IN
CONNECTORS
.
I

Turn
ignition
switch
to
OFF
.

CHECK
:
Is
there
poor
contact
in
connectors
between

ABSCM&HlU
and
ABS
sensor?
<
Ref
.
to

FOREWORD
[T3C1]
.*10
>

vES
:
Repair
connector
.

No
:
Go
to
step
10H7
.

I7Uli7
(CHECK
ABSCM&H/U
.

1)
Connect
all
connectors
.

2)
Erasethe
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
10H8
.

115

t
Sensor
gap

Sensor
gap

4-4d
ITyoNS1
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
with
Select
Monitor

Except
OUTBACK
model

1
2

D

84M0806E

OUTBACK
model

Front
Rear

zt

D

B4M
1036C

Except
OUTBACK
model

1
2

0

-V+

B4M0807E

OUTBACK
model

Front
Rear

1
22
1

D

_v+
-_
B4M
1037C
10H8
CHECK
ANY

I
APPEARANCE

.THER
TROUBLE
CODES

CHECK
;
Are
other
trouble
codes
being
output?

vES
:
Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporarypoor
contact
.

NOTE
:

Check
harness
and
connectors
between
ABSCM&H/U

and
ABS
sensor
.

10H9
CHECK
ABS
SENSOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABS
sensor
.

3)
Measure
resistanceof
ABS
sensor
connector
terminals
.

Terminal

Front
RH
No
.
1
-
No
.
2
:

Front
LHNo
.
1
-
No
.
2
:

Rear
RH
No
.
1
-
No
.
2
:

Rear
LH
No
.
1
-
No
.
2
:

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

~
:
Go
to
step
10H10
.

No
:
Replace
ABS
sensor
.

10H10
CHECK
BATTERY
SHORT
OF
ABS
SENSOR
.

1)
Disconnect
connector
from
ABSCM&H/U
.

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?

Go
to
step
10H11
.

No
:
Replace
ABS
sensor
.

116

BRAKES
[ABS
5
.3i
TYPE]
[710H12]
4-4d

10
.
Diagnostics
Chart
with
Select
Monitor

Except
OUTBACK
model

1
2

0

L
EV
B4M0807E

OUTBACK
model

Front
hear

2
1

D

-
B4M1037C

11
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
.
i
(+)
-
Chassis
ground
(-)
:

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

CHECK
:
Is
the
voltage
less
than
1
V?

Go
to
step
10H72
.

No
:
Replace
ABS
sensor
.

2
CHECK

I
ABSCM&H
UNAND/ABSSENSOR
BETWEEN

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
I
(F49)
No
.
11
-
No
.
12
:

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

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

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

CHECK
;
Is
theresistance
between
0
.8
and
1
.2
kS2?

YES
:
Go
tostep
10H13
.

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

and
ABS
sensor
.

117