1997 SUBARU LEGACY sensor

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

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

B
:
TROUBLE
CODE
21
(FRONT
RH)

C
:
TROUBLE
CODE
23
(FRONT
LH)

D
:
TROUBLE
CODE
25
(REAR
RH)

E
:
TROUBLE
CODE
27
(REAR
LH)

-
ABNORMAL
ABS
SENSOR
(OPEN
CIRCUIT

OR
INPUT
VOLTAGE
TOO
HIGH)
-

DIAGNOSIS
:

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

Faulty
harness
connector

TROUBLE
SYMPTOM
:

*
ABS
does
notoperate
.

WIRING
DIAGRAM
:

F49

ABS
control
module
and
hydraulic
control
unit

OUTBACK
with
steproof
model
B~5
O
O
P8
OO
Ft
100

1
3
1
10
70969
4
78

Rear
ABS
sensor
LH

RearABS
sensor
RH

r----------------
I
OUTBACK
with
steproof
model
I
I
Q
I

RearABS-C~l
sensor
LH

I
I

RearABS
j
~--m
sensor
RH

I
Q
I
------------J

Front
ABS
sensorLH

Front
ABS
sensor
RH

f{9

1
345678911112131415
1116
1
17
1
18
1
19
1
2
0
2
122
4
26
7
1
28
1
29
130131
1

B4M1238

32

BRAKES
[ABS
5
.31
TYPE]
[TSE2]4-4d

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

Except
OUTBACK
model

1
2

D

S2
B4MOSO6E

OUTBACK
model

Front
Rear

1
2
2
1

D

84M
1036C

Except
OUTBACK
model

1
2

-
L
Vq
f
1

B4MO807E

OUTBACK
model

Front
Rear

2
1

D

_v
B4M1037C

$E1
CHECK
ABS
SENSOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABS
sensor
.

3)
Measure
resistance
of
ABS
sensor
connector
terminals
.

Terminal

Front
RH
No
.
1
-
No
.
2
:

Front
LH
No
.
1
-
No
.
2
:

Rear
RH
No
.
1
-
No,
2
:

Rear
LHNo
.
1
-
No
.
2
:

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

,rES
:
Go
to
step
8E2
.

No
:
Replace
ABS
sensor
.

8E2
I
CHECK
BATTERY
SHORT
OF
ABS
SENSOR
.

1)
Disconnect
connector
from
ABSCM&H1U
.

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?

vES
:
Go
to
step
8E3
.

No
:
Replace
ABS
sensor
.

33

4-4d[T8E3]
BRAKES
[ABS
5
.31
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

Except
OUTBACK
model

M112

L
V
21
B4MOB07E

OUTBACK
model

Front
Rear

1
2
DI
2
1

D

_v
-_
B4M1037C

8E3
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
.
1
(+)
-
Chassis
ground
(-)
:

Rear
LH
No
.
1
(+)
-
Chassis
ground
(
)
:

CHECK
:
Is
the
voltage
less
than
1
V?

vES
:
Go
tostep
8E4
.

No
:
Replace
ABS
sensor
.

ETWEEN
8E4
CHECK

ABSCM&H
U
AND,ABS
SENSOR
.

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

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

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

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

CHECK
:
Is
theresistance
between
0
.8
and
1
.2
kSZ?

vES
:
Go
to
step
8E5
.

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

and
ABS
sensor
.

34

BRAKES
[ABS
5
.31
TYPE]
[r8E71
4-4d

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

F49

B4M
1240A
'I

f
CHECK
BATTERY
SHORT
OF
HARNESS
.

Measure
voltage
between
ABSCM&H/U
connector
and

chassis
ground
.

Connector
&
terminal

Trouble
code
21
I
(F49)
No
.
11
(+)
-
Chassis
ground

Trouble
code
23
l
(F49)
No
.
9
(+)
-
Chassis
ground

Trouble
code
25
l
(F49)
No
.
14
(+)
-
Chassis
ground

Trouble
code
27
/
(F49)
No
.
7
(+)
-
Chassis
ground

(-)
:

CHECK
:
Is
thevoltageless
than
1
V?

ves
:
Go
to
step
8E6
.

No
:
Repair
harness
between
ABSCM&H/U
and
ABS

sensor
.

18E6
I
CHECK
BATTERY
SHORT
OFHARNESS
.

1)
Turn
ignition
switch
to
ON
.

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

chassis
ground
.

Connector
&
terminal

Trouble
code
21
/
(F49)
No
.
11
(+)
-
Chassis
ground

Trouble
code
23
l
(F49)
No
.
9
(+)
-
Chassis
ground

Trouble
code
25
l
(F49)
No
.
14
(+)
-
Chassis
ground

Trouble
code
27
/
(F49)
No
.
7
(+)
-
Chassis
ground

CHECK
:
Is
the
voltage
less
than
1
V?

ves
:
Go
to
step
8E7
.

No
:
Repair
harness
between
ABSCM&H/U
and
ABS

sensor
.

8E7
CHECK
INSTALLATION
OF
ABS
SENSOR
.

Tightening
torque
:

32
f
10
N~m
(3
.3
f
1
.0
kg-m,
24
f
7
ft-Ib)

CHECK
:
Are
the
ABS
sensor
installation
bolts
tight-

ened
securel
y?

vES
:
Go
to
step
8E8
.

No
:
Tighten
ABS
sensor
installation
bolts
securely
.

35

4-4d
[TSES1
BRAKES
[ABS
5
.31
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

G4M0700
I

Rear
Sensor
gap

G4M0701

8E8
I
CHECK
INSTALLATION
OFTONE
WHEEL
.

Tightening
torque
:

13
f
3
N~m
(1.3
f
0
.3
kg-m,
9
f
2
.2
ft-Ib)

CHECK
:
Are
thetone
wheel
installation
bolts
tight-

ened
securely?

,rES
:
Go
to
step
8E9
.

No
:
Tightentone
wheel
installation
bolts
securely
.

8E9
I
CHECK
ABS
SENSOR
GAP
.

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

eter
of
the
wheel
.

CHECK
;
Is
the
gap
within
the
specifications
shown
in

the
following
table?

Front
wheel
Rear
wheel

Specifications0
.9
-
1
.4
mm

(0
.035
-
0
.055
in)
0
.7
-
1
.2
mm

(0
.028
-
0
.047
in)

ves
:
Go
to
step
8E10
.

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
.

8E10
CHECK
HUB
RUNOUT
.

Measure
hub
runout
.

CHECK
:
Is
the
runouf
less
than
0
.05
mm
(0
.0020
in)?

vES
:
Go
to
step
8E11
.

No
:
Repair
hub
.

36
Sensorgap

BRAKES
[ABS
5
.3i
TYPE]
[T8E13]
4-4d

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

Except
OUTBACK
model

1
2

D
L
S2

B4M0818E

OUTBACK
model

Front
Rear

1
2
J
T~
2
1
L
2

B4M1042C

CHECK
GROUND
SHORT
OF
ABS
SENSOR
.

1)
Turn
ignition
switch
to
ON
.

2)
Measure
resistance
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
LHNo
.
1
-
Chassis
ground
:

CHECK
:
Is
the
resistance
more
than
1
MS2?

,rES
:
Go
to
step
8E12
.

No
:
Replace
ABS
sensor
and
ABSCM&H/U
.

CHECK
GROUND
SHORT
OFHARNESS
.

1)
Turn
ignition
switch
to
OFF
.

2)
Connect
connector
to
ABS
sensor
.

3)
Measure
resistance
between
ABSCM&H/U
connector

terminal
and
chassis
ground
.

Connector
&
terminal

Trouble
code
21
I
(F49)
No
.
11
-
Chassis
ground
:

Trouble
code
23
l
(F49)
No
.
9
-
Chassis
ground
:

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

Trouble
code
27
/
(F49)
No
.
7
-
Chassis
ground
:

CHECK
;
Is
the
resistance
more
than
1
MS2?

,rES
:
Go
to
step
8E13
.

No
:
Repair
harness
between
ABSCM&H/U
and
ABS

sensor
.

Replace
ABSCM&H/U
.

(CHECK
POOR
CONTACT
IN
CONNECTORS
.

CHECK
:
Is
there
poor
contact
in
connectors
between

ABSCM&HIU
and
ABS
sensor?
<
Ref
.
to

FOREWORD
[T3C1]
.*10
>

vES
:
Repair
connector
.

No
:
Go
to
step
8E14
.

37

4-4d
[T8E14]
BRAKES
[ABS
5
.31
TYPE]
8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

I

-

f
8E14
CHECK
ABSCM&H/U
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4)
Read
outthe
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
8E15
.

I8E1
5
CHECK
ANY

IAPPEARANCE

.THER
TROUBLE
CODES

Are
other
trouble
codes
being
output?

Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporarypoor
contact
.

NOTE
:

Check
harness

and
ABS
sensor
.

and
connectors
between
ABSCM&H/U

38

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

F
:
TROUBLE
CODE
22
(FRONT
RH)

G
:
TROUBLE
CODE
24
(FRONT
LH)

H
:
TROUBLE
CODE
26
(REAR
RH)

I
:
TROUBLE
CODE
28
(REAR
LH)

-
ABNORMAL
ABS
SENSOR
(ABNORMAL
ABS
SENSOR
SIGNAL)
-

DIAGNOSIS
:

"
Faulty
ABS
sensor
signal
(noise,
irregular
signal,
etc
.)

Faulty
harness/connector

TROUBLE
SYMPTOM
:

9
ABS
does
not
operate
.

WIRING
DIAGRAM
:

f49

ABS
control
module
and
hydraulic
control
unit

OUTBACK
withstep
OO
roof
model
815
86

LL
]
Iwl

_-^
B15

~
B~~
_____===_-r
m--~~
Front
ABS
~
sensorLH

----
---
-----------
Front
ABS
-
-
----------
[Z1-1
~
sensor
RH

Twisted
~-
wire
F1Pt
OO

Twisted
wire
~
::M

Ft
100

1
3
1
10
4
78

Rear
ABS
sensorLH

RearABS
sensor
RH

I
OUTBACK
withsteproof
model
I
I
~
I

RearABS
«7
sensor
LH

II

RearABS
j

BE
sensor
RH

L-
-
-
--
-
-
-
-
-
-
-
-
-
--
-

QD

1
1
~
131415
1
§
17181911011111211
14
1

J
116117118119120121
223
24
6
2718
2930
31

B4M1238

40