Page 25 of 3342
![SUBARU LEGACY 1997 Service Repair Manual 4-4
[wzsc2]
SERVICE
PROCEDURE
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
(ABS
5
.3i
Type]
{~~Y+)~
_~00
G4M0464
2
.
CHECKINGTHE
HYDRAULIC
UNIT
ABS
OPERATION
WITH
BRAKE
TESTER
SUBARU LEGACY 1997 Service Repair Manual 4-4
[wzsc2]
SERVICE
PROCEDURE
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
(ABS
5
.3i
Type]
{~~Y+)~
_~00
G4M0464
2
.
CHECKINGTHE
HYDRAULIC
UNIT
ABS
OPERATION
WITH
BRAKE
TESTER](/manual-img/17/57434/w960_57434-24.png)
4-4
[wzsc2]
SERVICE
PROCEDURE
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
(ABS
5
.3i
Type]
{~~Y+)~
_~00
G4M0464
2
.
CHECKINGTHE
HYDRAULIC
UNIT
ABS
OPERATION
WITH
BRAKE
TESTER
1)
In
the
case
of
AWD
AT
vehicles,
install
aspare
fuse
with
the
FWD
connector
in
the
engine
compartment
to
simu-
late
FWD
vehicles
.
2)
Prepare
for
operating
ABS
sequence
control
.
<
Ref,to
[W25D1
]*10
or
[W25D2]
.*10
>
3)
Setthe
front
wheels
orrear
wheels
on
the
brake
tester
and
set
the
select
lever's
position
at
"neutral"
.
4)
Operate
the
brake
tester
.
5)
Perform
ABS
sequence
control
.
<
Ref
.
to
[W25D1]*10
step
1
or
[W25D2]*10
step
1
.
>
6)
Hydraulic
unit
begins
to
work
;
and
check
the
following
working
sequence
.
(1)
The
FL
wheel
performs
decompression,
holding,
and
compression
in
sequence,
and
subsequently
the
FR
wheel
repeats
the
cycle
.
(2)
The
RR
wheel
performs
decompression,
holding,
and
compression
in
sequence,
and
subsequently
the
RL
wheel
repeats
the
cycle
.
7)
Read
values
indicated
on
the
brake
tester
and
check
if
the
fluctuationof
values,
when
decompressed
and
compressed,
meet
the
standard
values
.
Unit
:
N
(kg,
Ib)
Initial
value
When
decompressed
When
compressed
Front
wheel
981
(100,
221)
490
(50,
110)or
less
981
(100,
221)
or
more
Rear
wheel
981
(100,
221)
490
(50,
110)
or
less
981
(100,
221)or
more
8)
After
checking,
also
check
if
any
irregular
brake
pedal
tightness
is
felt
.
10
Page 26 of 3342
![SUBARU LEGACY 1997 Service Repair Manual
SERVICE
PROCEDURE
[W25D21
4-4
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
Diagnosis
connector
--J
1
I`
--~
~
-
Diagnosis
terminals
3
terminal
6
terminal
-
SUBARU LEGACY 1997 Service Repair Manual
SERVICE
PROCEDURE
[W25D21
4-4
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
Diagnosis
connector
--J
1
I`
--~
~
-
Diagnosis
terminals
3
terminal
6
terminal
-](/manual-img/17/57434/w960_57434-25.png)
SERVICE
PROCEDURE
[W25D21
4-4
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
Diagnosis
connector
--J
1
I`
--~
~
''-
Diagnosis
terminals
3
terminal
6
terminal
-
/
B4M0082D
D
:
ABS
SEQUENCE
CONTROL
1)
Under
the
ABS
sequence
control,
after
thehydraulic
unit
solenoid
valve
is
driven,
theoperation
of
thehydrau-
lic
unit
can
be
checked
by
means
of
the
brake
tester
or
pressure
gauge
.
2)
ABS
sequence
control
can
be
started
by
diagnosis
connector
or
select
monitor
.
1
.
OPERATIONAL
GUIDELINES
OF
THE
ABS
SEQUENCE
CONTROL
WITH
DIAGNOSIS
CONNECTOR
1)
Connect
diagnosis
terminals
to
terminals
No
.
3
andNo
.
6
of
the
diagnosis
connector
beside
driver's
seat
heater
unit
.
2)
Setthe
speed
of
all
wheels
at
4
km/h
(2
MPH)
or
less
.
3)
Turn
ignition
switch
OFF
.
4)
Within
0
.5
seconds
after
the
ABS
warning
light
goes
out,
depress
the
brake
pedal
and
hold
it
immediately
after
ignition
switch
is
turned
to
ON
.
CAUTION
:
Do
not
depress
the
clutch
pedal
.
NOTE
:
*
When
the
ignition
switch
is
setto
on,the
brake
pedal
must
not
be
depressed
.
Engine
must
not
operate
.
5)
After
completion
of
ABS
sequence
control,
turn
ignition
switch
OFF
.
2
.
OPERATIONAL
GUIDELINES
OF
THE
ABS
SEQUENCE
CONTROL
WITH
SELECT
MONITOR
NOTE
:
In
the
event
of
any
trouble,
the
sequence
control
may
not
be
operative
.
In
such
a
case,
activate
the
sequence
control,
referring
to
"OPERATIONAL
GUIDELINES
OF
THE
ABS
SEQUENCE
CONTROL
WITHDIAGNOSIS
CONNEC-
TOR
"
.
<
Ref
.
to
4-4
[W25D1],*10>
1)
Connect
select
monitor
to
data
link
connector
beside
driver's
seat
heater
unit
.
2)
Turn
ignition
switch
ON
.
3)
Put
select
monitor
to
ABS
mode
.
11
Page 27 of 3342
4-4
[W25D2]
SERVICE
PROCEDURE
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
[F-101
O
ENT
B4M0635
ABS
FUNCTION
CHECK
MODE
B4M0997
I
BRAKE
ON
KEEP100-150
B4M0998
I
MODE
START
PRESS
ENT
KEY
B4M0999
FUNCTION
START
UNABLE
SWIM
4)
Press
FD
1
ENT
key
.
5)
The
message
shown
in
the
figure
is
displayed
.
6)
The
message
shown
in
the
figure
is
displayed
as
fol-
lows
:
(1)
When
using
the
brake
tester,
depress
brake
pedal
with
braking
force
of
981
N
(100
kg,
221
Ib)
.
(2)
When
using
the
pressure
gauge,
depress
brake
pedalsoas
to
make
the
pressure
gauge
indicate
3,432
kPa
(35
kg/cm2,
498
psi)
.
CAUTION
:
Do
not
depress
the
clutch
pedal
.
7)
When
the
message
shown
in
the
figure
is
displayed,
press
ENT
key
.
8)
Check
points
will
be
displayed
on
select
monitor
.
9)
WhenABS
sequence
control
cannot
be
started
(by
system
malfunction,
etc
.),
the
message
shown
in
the
fig-
ure
will
be
displayed
.
NOTE
:
Read
the
trouble
codes
.
Repair
faulty
parts
.
12
Page 28 of 3342
![SUBARU LEGACY 1997 Service Repair Manual
SERVICE
PROCEDURE
[w2sDa1
4-4
25
.
AgS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
AB
S
FUNCTION
CHECK
END
B4M1030
MODE
RESTART?
0
:
YE
S
1
:
NO
H4M
1144
10)
After
SUBARU LEGACY 1997 Service Repair Manual
SERVICE
PROCEDURE
[w2sDa1
4-4
25
.
AgS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
AB
S
FUNCTION
CHECK
END
B4M1030
MODE
RESTART?
0
:
YE
S
1
:
NO
H4M
1144
10)
After](/manual-img/17/57434/w960_57434-27.png)
SERVICE
PROCEDURE
[w2sDa1
4-4
25
.
AgS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type]
AB
S
FUNCTION
CHECK
END
B4M1030
MODE
RESTART?
0
:
YE
S
1
:
NO
H4M
1144
10)
After
completion
of
ABS
sequence
control
.
11)
Press0key
tostart
ABS
sequence
control
again
and
press
1
key
to
end
.
3
.
CONDITIONS
FOR
COMPLETIONOF
ABS
SEQUENCE
CONTROL
When
the
following
conditions
develop,
the
ABS
sequence
control
stops
and
ABS
operation
is
returned
to
the
normal
control
mode
.
1)
When
the
speed
ofat
least
one
wheel
reaches
10
km/h
(6
MPH)
.
2)
When
terminal
No
.
3
or
No
.
6
are
separated
from
diag-
nosis
terminals
.
(When
select
monitor
is
not
used
.)
3)
When
the
brakepedal
is
released
during
sequence
control
and
the
braking
lamp
switch
is
set
to
off
.
4)
When
brake
pedal
is
depressed
afterignition
key
is
turned
to
ON,
and
before
ABS
warning
light
goes
out
.
(When
select
monitor
is
not
used
.)
5)
When
brakepedal
is
not
depressed
after
ignition
key
is
turned
to
ON,
acrd
within
0
.5
seconds
after
ABS
warn-
ing
light
goes
out
.
(When
select
monitor
is
not
used
.)
6)
After
completion
of
the
sequence
control
.
7)
When
malfunction
is
detected
.
(When
select
monitor
is
used
.)
13
Page 29 of 3342
![SUBARU LEGACY 1997 Service Repair Manual 4-4
[W25D4]
SERVICE
PROCEDURE
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type)
4
.
CONDITIONS
FORABS
SEQUENCE
CONTROL
4
km/h
Speed
of
all
wheels
HIGF
Terminal
No
.3 SUBARU LEGACY 1997 Service Repair Manual 4-4
[W25D4]
SERVICE
PROCEDURE
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type)
4
.
CONDITIONS
FORABS
SEQUENCE
CONTROL
4
km/h
Speed
of
all
wheels
HIGF
Terminal
No
.3](/manual-img/17/57434/w960_57434-28.png)
4-4
[W25D4]
SERVICE
PROCEDURE
25
.
ABS
Control
Module
and
Hydraulic
Control
Unit
(ABSCM&H/U)
[ABS
5
.3i
Type)
4
.
CONDITIONS
FORABS
SEQUENCE
CONTROL
4
km/h
Speed
of
all
wheels
HIGF
Terminal
No
.3
and
No
.6
LOV1
Operational
guide
lineofIgnition
key
switch
O
sequence
OFF
control
O
ABS
warning
light
OFF
HIGF
Stop
light
switch
LO"
HIGF
AT
ABS
signal
LOW
Valve
relay
ON
OFF
FL
outlet
valve
ON
OFF
FL
inlet
valve
O
NOFF
Operational
FR
outlet
valve
ON
OFF
pattern
of
ON
sequence
FR
inlet
valve
OFF
control
RR
outlet
valve
OFF
RR
inlet
valve
ON
OAF
RL
outlet
valve
OFF
RL
inlet
valve
ONOFF
Pump
motor
OFF
Operational
Pressure
of
master
cylinder
pressure
of
Pressure
of
FLwheel
cylinder
Pressure
of
FR
wheel
cylinder
sequence
Pressure
of
RR
wheel
cylinder
control
Pressure
of
RL
wheel
cylinder
Unit
:
second
B4M1001A
I
NOTE
:
*
When
select
monitor
is
used,
control
operation
starts
at
point
A
.
The
patterns
from
IGN
key
ON
to
the
point
A
show
that
operation
is
started
by
diagnosis
connector
.
HIGH
means
high
voltage
.
LOW
means
low
voltage
.
14
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 31 of 3342
![SUBARU LEGACY 1997 Service Repair Manual
4-4d
[T1oo]
BRAKES
[ABS
5
.31
TYPE]
1
.
Supplemental
Restraint
System
"Airbag"
-
2
.
Pre-inspection
1
.
Supplemental
Restraint
System
"Airbag"
Airbagsystem
wiring
harness
is
routed
near
the
ABS
SUBARU LEGACY 1997 Service Repair Manual
4-4d
[T1oo]
BRAKES
[ABS
5
.31
TYPE]
1
.
Supplemental
Restraint
System
"Airbag"
-
2
.
Pre-inspection
1
.
Supplemental
Restraint
System
"Airbag"
Airbagsystem
wiring
harness
is
routed
near
the
ABS](/manual-img/17/57434/w960_57434-30.png)
4-4d
[T1oo]
BRAKES
[ABS
5
.31
TYPE]
1
.
Supplemental
Restraint
System
"Airbag"
-
2
.
Pre-inspection
1
.
Supplemental
Restraint
System
"Airbag"
Airbagsystem
wiring
harness
is
routed
near
the
ABS
sensor,
ABS
control
module
and
hydraulic
control
unit
.
CAUTION
:
All
Airbag
system
wiring
harness
and
connectors
are
colored
yellow
.
Do
not
use
electrical
test
equipment
on
these
circuit
.
e
Be
careful
not
to
damage
Airbag
system
wiring
har-
ness
when
servicing
the
ABS
sensor,
ABS
control
mod-
ule
and
hydraulic
control
unit
.
2
.
Pre-inspection
Before
performing
diagnostics,
check
the
following
items
which
might
affect
ABS
problems
:
A
:
MECHANICAL
INSPECTION
1
.
POWER
SUPPLY
1)
Measure
battery
voltage
and
specific
gravity
of
electro-
lyte
.
Standard
voltage
:
12
V,
or
more
Specific
gravity
:
Above
1
.260
2)
Check
the
condition
of
the
main
and
other
fuses,
and
harnesses
and
connectors
.
Also
check
for
proper
ground-
ing
.
2
.
BRAKE
FLUID
1)
Check
brake
fluidlevel
.
2)
Check
brake
fluid
leakage
.
3
.
BRAKEDRAG
Check
brake
drag
.
<
Ref
.
to
4-4
[K100].*1
>
4
.
BRAKE
PADAND
ROTOR
Check
brake
padand
rotor
.
<
Ref
.
to
4-4
[K100].*1
>
5
.
TIRE
SPECIFICATIONS,
TIRE
WEARAND
AIR
PRESSURE
Check
tire
specifications,
tire
wear
and
air
pressure
.
<
Ref
.
to
4-2
[S1
A1
],
[S1
A2]
.*1
>
2
Page 32 of 3342
![SUBARU LEGACY 1997 Service Repair Manual
4-4d
[T1oo]
BRAKES
[ABS
5
.31
TYPE]
1
.
Supplemental
Restraint
System
"Airbag"
-
2
.
Pre-inspection
1
.
Supplemental
Restraint
System
"Airbag"
Airbagsystem
wiring
harness
is
routed
near
the
ABS
SUBARU LEGACY 1997 Service Repair Manual
4-4d
[T1oo]
BRAKES
[ABS
5
.31
TYPE]
1
.
Supplemental
Restraint
System
"Airbag"
-
2
.
Pre-inspection
1
.
Supplemental
Restraint
System
"Airbag"
Airbagsystem
wiring
harness
is
routed
near
the
ABS](/manual-img/17/57434/w960_57434-31.png)
4-4d
[T1oo]
BRAKES
[ABS
5
.31
TYPE]
1
.
Supplemental
Restraint
System
"Airbag"
-
2
.
Pre-inspection
1
.
Supplemental
Restraint
System
"Airbag"
Airbagsystem
wiring
harness
is
routed
near
the
ABS
sensor,
ABS
control
module
and
hydraulic
control
unit
.
CAUTION
:
All
Airbag
system
wiring
harness
and
connectors
are
colored
yellow
.
Do
not
use
electrical
test
equipment
on
these
circuit
.
e
Be
careful
not
to
damage
Airbag
system
wiring
har-
ness
when
servicing
the
ABS
sensor,
ABS
control
mod-
ule
and
hydraulic
control
unit
.
2
.
Pre-inspection
Before
performing
diagnostics,
check
the
following
items
which
might
affect
ABS
problems
:
A
:
MECHANICAL
INSPECTION
1
.
POWER
SUPPLY
1)
Measure
battery
voltage
and
specific
gravity
of
electro-
lyte
.
Standard
voltage
:
12
V,
or
more
Specific
gravity
:
Above
1
.260
2)
Check
the
condition
of
the
main
and
other
fuses,
and
harnesses
and
connectors
.
Also
check
for
proper
ground-
ing
.
2
.
BRAKE
FLUID
1)
Check
brake
fluidlevel
.
2)
Check
brake
fluid
leakage
.
3
.
BRAKEDRAG
Check
brake
drag
.
<
Ref
.
to
4-4
[K100].*1
>
4
.
BRAKE
PADAND
ROTOR
Check
brake
padand
rotor
.
<
Ref
.
to
4-4
[K100].*1
>
5
.
TIRE
SPECIFICATIONS,
TIRE
WEARAND
AIR
PRESSURE
Check
tire
specifications,
tire
wear
and
air
pressure
.
<
Ref
.
to
4-2
[S1
A1
],
[S1
A2]
.*1
>
2