Page 22 of 3342
![SUBARU LEGACY 1997 Service Repair Manual
SERVICE
PROCEDURE
[w2sao1
4-4
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
A
:
REMOVAL
1)
Disconnect
ground
cablefrom
battery
.
2)
Remove
air
intake
duct
fromen SUBARU LEGACY 1997 Service Repair Manual
SERVICE
PROCEDURE
[w2sao1
4-4
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
A
:
REMOVAL
1)
Disconnect
ground
cablefrom
battery
.
2)
Remove
air
intake
duct
fromen](/manual-img/17/57434/w960_57434-21.png)
SERVICE
PROCEDURE
[w2sao1
4-4
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
A
:
REMOVAL
1)
Disconnect
ground
cablefrom
battery
.
2)
Remove
air
intake
duct
fromengine
compartment
to
facilitate
removal
of
ABSCM&H/U
.
3)
Use
an
air-gun
to
get
rid
of
water
around
the
ABSCM&H/U
.
CAUTION
:
The
contact
will
be
insufficient
if
the
terminal
gets
wet
.
4)
Pull
on
the
lock
of
the
ABSCM&H/U
connector
to
remove
it
.
5)
Disconnect
connector
from
ABSCM&H/U
.
CAUTION
:
Be
careful
not
tolet
water
or
other
foreign
matter
con-
tact
the
ABSCM&H/U
terminal
6)
Unlock
cable
clip
.
7)
Disconnect
brake
pipes
from
ABSCM&H/U
.
CAUTION
:
Wrap
brake
pipes
with
vinyl
bag
to
avoid
spilling
brake
fluid
on
vehicle
body
.
8)
Remove
ABSCM&H/U
fromengine
compartment
.
CAUTION
:
9
ABSCM&H/U
cannotbe
disassembled
.
Do
not
attempt
to
loosen
bolts
and
nuts
.
"
Do
not
drop
or
bump
ABSCM&H/U
.
"
Do
not
turn
the
ABSCM&H/U
upside
down
or
place
it
on
its
side
.
*
Be
careful
to
prevent
foreign
particles
from
getting
into
ABSCM&H/U
.
9
Apply
acoat
of
rust-preventive
wax
(Nippeco
LT
or
GB)
to
bracket
attaching
bolt
after
tightening
.
*
Do
not
pull
harness
disconnecting
harness
connector
.
7
Page 23 of 3342
4-4
[w2sBO]
SERVICE
PROCEDURE
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
B
:
INSPECTION
i
Mark
>
ABSCM&H/U
B4M
1248A
/Pressure
ga
u
ge
\
'
/\
B4M0633A
1)
Check
connected
and
fixed
condition
of
connector
.
2)
Check
specifications
of
the
mark
with
ABSCM&H/U
.
Mark
Model
C3
AWD
AT
C4
AWD
MT
C
:
CHECKING
THE
HYDRAULIC
UNIT
ABS
OPERATION
1
.
CHECKINGTHE
HYDRAULIC
UNIT
ABS
OPERATION
BY
PRESSURE
GAUGE
1)
Lift-up
vehicle
and
remove
wheels
.
2)
Disconnect
the
air
bleeder
screwsfrom
the
FL
andFR
caliper
bodies
.
3)
Connect
two
pressure
gauges
to
the
FL
andFR
cali-
perbodies
.
CAUTION
:
Pressure
gauges
used
exclusively
for
brake
fluid
must
be
used
.
e
Do
not
employ
pressure
gauge
previously
used
for
transmission
since
the
piston
seal
is
expanded
which
may
lead
to
malfunction
of
the
brake
.
NOTE
:
Wrap
sealing
tape
around
the
pressure
gauge
.
8
Page 24 of 3342
![SUBARU LEGACY 1997 Service Repair Manual
SERVICE
PROCEDURE
[w2scI]
4-4
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
4)
Bleed
air
from
the
pressure
gauges
.
5)
Perform
ABS
sequence
control
.
Ref
.
to
[W SUBARU LEGACY 1997 Service Repair Manual
SERVICE
PROCEDURE
[w2scI]
4-4
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
4)
Bleed
air
from
the
pressure
gauges
.
5)
Perform
ABS
sequence
control
.
Ref
.
to
[W](/manual-img/17/57434/w960_57434-23.png)
SERVICE
PROCEDURE
[w2scI]
4-4
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
4)
Bleed
air
from
the
pressure
gauges
.
5)
Perform
ABS
sequence
control
.
Ref
.
to
[W25D0]
.*10
>
6)
When
thehydraulic
unit
begins
to
work,
and
first
the
FL
side
performs
decompression,
holding,
and
compression,
and
then
the
FR
side
performs
decompression,
holding,
and
compression
.
7)
Read
values
indicated
on
the
pressure
gauge
and
check
if
the
fluctuationof
the
values
between
decompres-
sion
and
compression
meets
the
standard
values
.
Also
check
if
any
irregular
brake
pedal
tightness
is
felt
.
Initial
value
When
decompressed
When
compressed
Front
wheel
3,432
kPa
(35
kg/cmz,
498
psi)
490kPa
(5
kg/cm2,
71
psi)
3,432
kPa
(35
kg/cm2,
498
psi)
or
less
or
more
Rear
wheel
3,432
kPa
(35
kg/cm2,
498
psi)
490kPa
(5
kg
/cm2,
71
psi)
3,432
kPa
(35
kg/cm2,
498
psi)
or
less
or
more
8)
Remove
pressure
gauges
from
FL
and
FR
caliper
bod-
ies
.
9)
Remove
air
bleeder
screws
from
the
RL
andRR
caliper
bodies
.
10)
Connect
the
air
bleeder
screws
to
the
FL
and
FR
cal-
iper
bodies
.
11)
Connect
two
pressure
gauges
to
the
RL
and
RR
cal-
iper
bodies
.
12)
Bleed
air
from
the
pressure
gauges
and
the
FL
and
FR
caliper
bodies
.
13)
Perform
ABS
sequence
control
.
<
Ref
.
to
[W25D0]
.*10
>
14)
When
thehydraulic
unit
begins
to
work,
at
first
the
RR
side
performs
decompression,
holding,
and
compression,
and
then
the
RL
side
performs
decompression,
holding,
and
compression
.
15)
Read
values
indicated
on
the
pressure
gauges
and
check
if
they
meet
thestandardvalue
.
16)
After
checking,
remove
the
pressure
gauges
from
cal-
iper
bodies
.
17)
Connect
the
air
bleeder
screws
to
RL
and
RR
caliper
bodies
.
18)
Bleed
air
from
brake
line
.
9
Page 30 of 3342
SERVICE
PROCEDURE
Iwz7oo1
4-4
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
-
27
.
G
Sensor
(ABS
5
.3i
Type)
E
:
INSTALLATION
1)
Install
ABSCM&H/U
.
CAUTION
:
Confirm
that
the
specifications
of
the
ABSCM&H/U
con-
forms
to
the
vehicle
specifications
.
Tightening
torque
:
18
f
5
N~m
(1
.8
±
0
.5
kg-m,
13
.0
±
3
.6ft-Ib)
2)
Connect
brake
pipes
to
their
correct
ABSCM&H/U
con-
nections
.
<
Ref
.
to
[W18A4]
.*10
>
3)
Using
cable
clip,
secure
ABSCM&H/U
harness
to
bracket
.
4)
Connect
connector
to
ABSCM&H/U
.
CAUTION
:
9
Be
sure
to
remove
all
foreign
matter
from
inside
the
connector
before
connecting
.
9
Ensure
that
the
ABSCM&H/U
connetor
is
securely
locked
.
5)
Install
air
intake
duct
.
6)
Connect
ground
cable
to
battery
.
7)
Bleed
air
from
the
brake
system
.
26
.
ABS
Sensor
(ABS
5
.3i
Type)
<
Ref
.
to
4-4
[W1400]
.*1
>
27
.
G
Sensor
(ABS
5
.3i
Type)
Ref
.
to
4-4
[W2400]
.*5
>
15
Page 37 of 3342
4-4d
[TSOi1
BRAKES
[ABS
5
.31
TYPE]
5
.
Control
Module
I/OSignal
5
.
Control
Module
I/O
Signal
1
.
I/O
SIGNAL
VOLTAGE
ABS
control
moduleand
hydraulic
control
unit
connector
Ell
30000000
00000
Connector
switch
i
F49
1
21314
5
1
6
1
7
1
8
1
9
1
10
1
11
1
12
1
13
1
14
1
15
16
171819
20
2122
232425
26
1
27
1
28
1
29
1
30
1
31
1
84M1228A
NOTE
:
*
The
terminal
numbers
in
the
ABS
control
module
and
hydraulic
control
unit
connector
are
as
shown
in
the
fig-
ure
.
9
When
the
connector
is
removed
from
the
ABSCM&H/U,
the
connector
switchcloses
the
circuit
between
terminal
No
.
21
andNo
.
23
.
The
ABS
warning
light
illuminates
.
8
Page 40 of 3342
![SUBARU LEGACY 1997 Service Repair Manual
BRAKES
[ABS
5
.31
TYPE]
[rsao]
4-4d
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
I
TROUBLE
OCCURS
.I
Is
Select
Monitor
available?
I
Yes
1
10
.
Diagnostic
Chart
with
Select
1
Monitor
.
Ask
SUBARU LEGACY 1997 Service Repair Manual
BRAKES
[ABS
5
.31
TYPE]
[rsao]
4-4d
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
I
TROUBLE
OCCURS
.I
Is
Select
Monitor
available?
I
Yes
1
10
.
Diagnostic
Chart
with
Select
1
Monitor
.
Ask](/manual-img/17/57434/w960_57434-39.png)
BRAKES
[ABS
5
.31
TYPE]
[rsao]
4-4d
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
I
TROUBLE
OCCURS
.I
Is
Select
Monitor
available?
I
Yes
1
10
.
Diagnostic
Chart
with
Select
1
Monitor
.
Ask
the
customer
when
and
how
the
trouble
occurred
using
interview
check
list
.
6
.
Diagnostics
Chart
for
On-board
Diagnosis
System
A
:
BASIC
DIAGNOSTICS
PROCEDURE
I
PRE-INSPECTION
I
I
CALLING
UPA
TROUBLE
CODE
.
I
No
trouble
code
is
readable
.
Inspection
using
Diagnostic
Chart
for
Warning
Light
Failure
.
Record
all
trouble
codes
.
Only
the
start
code
is
issued
.
Trouble
codes
are
issued
.
Perform
diagnostics
in
accordance
with
trouble
code
.
Trouble
code
I
Repair
.
designated
.
Clear
memory
.
I
INSPECTION
MODE
I
I
CALLING
UPA
TROUBLE
CODE
.
Only
the
star
t
code
is
issued
.
CONFIRMATION
TEST
END
Inspection
using
General
Diagnostics
chart
.
B4M
1051
A
CAUTION
:
Remove
foreign
matter
(dust,
water,
etc
.)
from
the
ABSCM&H/U
connector
during
removal
and
installation
.
NOTE
:
e
To
check
harness
for
broken
wires
or
short
circuits,
shake
it
while
holding
it
or
the
connector
.
*
When
ABS
warning
light
illuminates,
read
and
record
trouble
code
indicated
by
ABS
warning
light
.
11
Page 47 of 3342
BRAKES
[ABS
5
.31
TYPE]
[T7A3]
4-4d
7
.
Diagnostics
Chart
for
ABS
Warning
Light
Circuit
and
Diagnosis
Circuit
Failure
B1
2345
678910
1112
1
13
1
14
1
15
1
16
1
17
1
18
1
19
.
)
D
V
-
B4M1273A
I7A1
ICHONECK
IF
OTHER
WARNING
LIGHTS
TURN
Turn
ignition
switch
to
ON
(engine
OFF)
.
CHECK
:
Do
other
warning
lights
turn
on?
,rES
:
Go
to
step
7A2
.
No
:
Repair
combination
meter
.
7A2
I
CHECK
ABS
WARNING
LIGHT
BULB
.
1)
Turn
ignition
switch
to
OFF
.
2)
Remove
combination
meter
.
3)
Remove
ABS
warning
light
bulb
from
combination
meter
.
CHECK
:
Is
ABS
warning
light
bulb
OK?
,mss
:
Go
to
step
7A3
.
No
:
Replace
ABS
warning
light
bulb
.
7A3
CHECK
BATTERY
NG
LIGHT
HARNESS
SHO
RT
OF
ABS
WARN-
1)
Disconnect
connector
(B100)
from
connector
(F2)
.
2)
Measure
voltage
between
connector
(B100)
and
chas-
sis
ground
.
Connector
&
terminal
(B100)
No
.
9
(+)
-
Chassis
ground
(
)
:
CHECK
:
Is
thevoltage
less
than
3
V?
vES
:
Go
to
step
7A4
.
No
:
Repair
warning
light
harness
.
19
Page 67 of 3342
![SUBARU LEGACY 1997 Service Repair Manual
4-4d
[Tsis1
BRAKES
[ABS
5
.31
TYPE]
8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light
8100
~
F1
98
7
6543
2
3
2
11
1918
76
5141
1211
1
45678
0
0
20
Hz
Standard
outputvoltage
:
0
.12
SUBARU LEGACY 1997 Service Repair Manual
4-4d
[Tsis1
BRAKES
[ABS
5
.31
TYPE]
8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light
8100
~
F1
98
7
6543
2
3
2
11
1918
76
5141
1211
1
45678
0
0
20
Hz
Standard
outputvoltage
:
0
.12](/manual-img/17/57434/w960_57434-66.png)
4-4d
[Tsis1
BRAKES
[ABS
5
.31
TYPE]
8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light
8100
~
F1
98
7
6543
2
3
2
11
1918
76
5141
1211
1
45678
0
0
20
Hz
Standard
outputvoltage
:
0
.12
-
1
V
(When
it
is
20Hz
.)
134M
1242A
815
1
CHECK
ABS
SENSOR
SIGNAL
.
1)
Raise
all
four
wheels
of
ground
.
2)
Turn
ignition
switch
OFF
.
3)
Connect
theoscilloscope
to
the
connector
(F1)
or
con-
nector
(B100)
.
4)
Turn
ignition
switch
ON
.
5)
Rotate
wheels
and
measure
voltage
at
specified
fre-
quency
.
NOTE
:
When
this
inspection
is
completed,
the
ABS
control
mod-
ule
sometimes
stores
the
trouble
code
29
.
Connector
&
terminal
Trouble
code
22
l
(B100)
No
.
12
(+)
-
No
.
13
(-)
:
Trouble
code
24
l
(8100)
No
.
3
(+)
-
No
.
4
(-)
:
Trouble
code
26
l
(F1)
No
.
4
(+)
-
No
.
5
(-)
:
Trouble
code
28
l
(F1)
No
.
1
(+)
-
No
.
2
(
)
:
Specifiedvoltage
:
0
.12
-
1
V
(When
it
is
20
Hz
.)
CHECK
:
Is
oscilloscope
pattern
smooth,
as
shown
in
figure?
,rss
:
Go
to
step
819
.
No
:
Go
to
step
816
.
816
CHECK
ORTONE
CONTAM
WHEELINATION
OF
ABS
SENSOR
Remove
disc
rotor
or
drum
from
hub
in
accordance
with
trouble
code
.
NECK
:
Is
the
ABS
sensor
pole
piece
orthetone
wheel
contaminated
by
dirt
or
other
foreign
matter?
ves
:
Thoroughly
remove
dirt
or
other
foreign
matter
.
No
:
Go
to
step
817
.
817
CHECK
ONE
WHEEL
.
GEOF
ABS
SENSOR
OR
CHECK
:
Are
there
broken
or
damaged
in
the
ABS
sensor
pole
piece
orthe
tone
wheel?
,res
:
Replace
ABS
sensor
or
tone
wheel
.
No
:
Go
to
step
818
.
42