SUBARU LEGACY 1997 Service Repair Manual

BRAKES
[ABS
5
.31
TYPE]
[T8X5]
4-4d

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

8X1
I
CHECK
STOP
LIGHTS
COME
ON
.

Depress
the
brake
pedal
.

CHECK
:
Do
stop
lights
come
on?

,rES
:
Go
to
step
8X2
.

No
:
Repair
stop
lights
circuit
.
I
$X2
I
CHECK
OPEN
CIRCUIT
IN
HARNESS
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
ABSCM&H/U
.

3)
Depress
brake
pedal

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

chassis
ground
.

Connector
&
terminal

(F49)
No
.
2
(+)
-
Chassis
ground
(-)
;

CHECK
:
Is
thevoltage
between
10
V
and
15
V?

YES
:
Go
to
step
8X3
.

No
:
Repair
harness
between
stop
light
switch
and

ABSCM&H/U
.

8X3
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.

CHECK
:
Is
there
poor
contact
in
connector
between

stop
light
switch
and
ABSCM&HlU?
<
Ref
.
to

FOREWORD
[T3C1]
.*70
>

,rES
:
Repair
connector
.

No
:
Go
to
step
8X4
.

18X4
I
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
thecurrent

diagnosis
still
being
output?

,rES
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
8X5
.

8X5
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
.

83

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

Y
:
TROUBLE
CODE
56

-
ABNORMAL
G
SENSOROUTPUT

VOLTAGE
-

DIAGNOSIS
:

e
Faulty
G
sensor
output
voltage

TROUBLE
SYMPTOM
:

e
ABS
does
notoperate
.

WIRING
DIAGRAM
:

F49

ABS
control
module
and
hydraulic
control
unit

Ft
P11

1
3
45678

P1
P11

ABS
G
sensor

IIIL131

F49

123456789101112131415
1
16
1
17
1
18
1
19
1
20
11
21
2
2324252627
1
28
1
29
1
30
1
31
1

84M1260
ii

64

BRAKES
[ABS
5
.3i
TYPE]
IT8Y3J4-4d

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

`G/

Tn]
1
Mark

~-ABSCM&HlU
g4M1248A

P11

2
1

D

+V-

B4M0911
B

8YI
CHECK

TURNING

LL
FOUR
WHEELS
FOR
FREE

CHECK
:
Have
the
wheels
been
turned
freely
suchas

when
the
vehicle
is
lifted
up,
or
operatedon
a
rolling
road?

The
ABS
is
normal
.
Erase
the
trouble
code
.

Go
to
step
8Y2
.

CHECK
SPECIFICATIONS
OF
ABSCM&HIU
.

Check
specifications
of
the
mark
to
the
ABSCM&H/U
.

Mark
Model

C3
AWD
AT

C4
AWD
MT

1
'
he
an
dRSCM
fnr
dWn
MAIIPI
inciallprl
nna
FWD
model?

CAUTION
:

Be
sure
to
turn
ignition
switch
to
OFF
when
removing

ABSCM&H/U
.

,rES
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
8Y3
.

18Y3
I
CHECK
INPUT
VOLTAGEOF
G
SENSOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Remove
console
box
.

3)
Disconnect
G
sensor
from
body
.
(Do
not
disconnect

connector
.)

4)
Turn
ignition
switch
to
ON
.

5)
Measure
voltage
between
G
sensor
connector
termi-

nals
.

Connector
&
terminal
(P11)
No
.
1
(+)
-
No
.
3
(
)
:

CHECK
:
Is
thevoltage
between
4
.75
and
5
.25
V?

Go
to
step
8Y4
.

No
:
Repair
harness/connector
between
G
sensor
and

ABSCM&H/U
.

85

4-4d[T8Y4]
BRAKES
[ABS
5
.31
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Codeby
ABS
Warning
Light

1

1
2
34
5
67
819
h
011
111
211311411
l1
gi
18191201211221
23
1
24
1
25
1
26
1
7Ed2
30131

LS
B4M1261A

F49
F49

8Y4
CHECKOPEN
IN
G
SENSOR
-

PUT
HARNESS
A
DuGROUND
HA
NESS
.T

1)
Turn
ignition
switch
to
OFF
.

2}
Disconnect
connector
from
ABSCM&H/U
.

3)
Measure
resistance
between
ABSCM&H/U
connector

terminals
.

Connector
&
terminal

(F49)
No
.
30
-
No
.
28
:

CHECK
;
Is
the
resistance
between
4
.3
and
4
.9
kS2?

,rEg
:
Go
to
step
8Y5
.

No
:
Repair
harness/connector
between
G
sensor
and

ABSCM&H/U
.

8Y5
CHECK
GROUND

OUTPUT
HARN

SSHORT
IN
G
SENSOR

1)
Disconnect
connector
from
G
sensor
.

2)
Measure
resistance
between
ABSCM&H/U

and
chassis
ground
.

Connector
&
terminal

(F49)
No
.
6
-
Chassis
ground
:

CHECK
;
Is
the
resistance
more
than
1
M52?

S
:
Go
to
step
8Y6
.

connector

No
:
Repair
harness
between
G
sensor

ABSCM&H/U
.

and
8Y6
CHECK
BATTERY
SHORT
OF
HARNESS
.

Measure
voltage
between
ABSCM&H/U
connector
and

chassis
ground
.

Connector
&
terminal

(F49)
No
.
6
(+)
-
Chassis
ground
(-)
:

CHECK
;
Is
the
voltage
less
than
1
V?

,rES
:
Go
to
step
8Y7
.

No
:
Repair
harness
between
G
sensor
and

ABSCM&H/U
.

86

-
84M1262A
I

B4M1263A
I

BRAKES
[ABS
5
.31
TYPE]
IT8Y$I4-4d

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

$Y7
CHECK
BATTERY
SHORT
OF
HARNESS
.

1)
Turn
ignition
switch
to
ON
.

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

chassis
ground
.

Connector
&
terminal

(F49)
No
.
6
(+)
-
Chassis
ground
(
)
:

CHECK
;
Is
the
voltage
less
than
1
V?

Go
to
step
8Y8
.

No
:
Repair
harness
between
G
sensor
and

ABSCM&H/U
.

8Y8
I
CHECK
GROUND
SHORT
OF
HARNESS
.

Measure
resistance
between
ABSCM&H/U
connector
and

chassis
ground
.

Connector
&
terminal

(F49)
No
.
28
-
Chassis
ground
:

CHECK
;
Is
theresistance
more
than
1
MS2?

Go
to
step
8Y9
.

No
:
Repair
harness
between
G
sensor
and

ABSCM&H/U
.

Replace
ABSCM&H/U
.

87

4-4d
[rsYS1
BRAKES
[ABS
5
.3i
TYPE]

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

B4M0915I

Front

t

1

0

B4M0917A

0

Front

i
a

--

B4M0918A

1
8Y9
I
CHECK
G
SENSOR
.
I

1)
Turn
ignition
switch
to
OFF
.

2)
Remove
G
sensor
from
vehicle
.

3)
Connect
connector
to
G
sensor
.

4)
Connect
connector
to
ABSCM&H/U
.

5)
Turn
ignition
switch
to
ON
.

6)
Measure
voltage
between
G
sensor
connector
termi-

nals
.

Connector
&
terminal

(P11)
No
.
2
(+)
-
No
.
1(
)
:

CHECK
:
Is
thevoltage
between
2
.1
and
2
.4
V
when
G

sensor
is
horizontal?

0
:
Go
tostep
8Y10
.

No
:
Replace
G
sensor
.

8Y10
CHECK
G
SENSOR
.

Measure
voltage
between
G
sensor
connector
terminals
.

Connector
&
terminal

(P11)
No
.
2
(+)
-
No
.
1(
)
:

CHECK
;
Is
the
voltage
between
3
.7
and
4
.1
V
when
G

sensor
is
inclined
forwards
to
90°?

Go
tostep
8Y11
.

No
:
Replace
G
sensor
.

CHECK
G
SENSOR
.

Measure
voltage
between
G
sensor
connector
terminals
.

Connector
&
terminal

(P11)
No
.
2
(+)
-
No
.
1
(
)
:

CHECK
;
Is
thevoltage
between
0
.5
and
0
.9
V
when
G

sensor
is
inclined
backwards
to
90°?

Go
tostep
8Y12
.

No
:
Replace
G
sensor
.

8Y12
CHECK
POOR
CONTACT
IN
CONNECTORS
.

CHECK
:
Is
there
poor
contact
in
connector
between

ABSCM&HI
U
and
G
sensor?
<
Ref
.
to
FORE-

WORD
[T3C1]
.*10
>

0
:
Repair
connector
.

No
:
Go
to
step
8212
.

88

BRAKES
[ABS
5
.31
TYPE]
[T8Y14I4-4d

8
.
Diagnostics
Chart
with
Trouble
Code
by
ABS
Warning
Light

8Y13
CHECK
ABSCM&HIU
.

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?

Replace
ABSCM&H/U
.

No
:
Go
tostep
8Y14
.

8Yt4
CHECK
ANY

`APPEARANCE
.

THER
TROUBLE
CODES

K
:
Are
other
trouble
codes
being
output?

0
:
Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

A
temporarypoor
contact
.

89

4-4d
[TSOO1
BRAKES
[ABS
5
.31
TYPE]

9
.
Select
Monitor
Function
Mode

o

°~°

poo

I
\G2M0096

9
.
Select
Monitor
Function
Mode

Applicable
cartridge
of
select
monitor
:
No
.
498346300

A
:
LIST
OF
FUNCTION
MODE

1,
F
MODE
(ROM
ID,
ANALOG
DATA
ARE

DISPLAYED
.)

Function
code
it
M
i
C
easur
ng
ems
ontents
to
be
monitored
Scroll
Ref
.
to
Code
Abbreviation

F00
ROM
ID
ECM
identification
ROM
ID
number
of
ECM
is
read
and
enabled
possible
[T9B0]*10
communication
state
is
displayed
.

F01
FRFR
wheel
speedWheel
speed
detected
by
the
FR
ABS
sensor
is
possible
[T9COJ*10
(mile/h)
displayed
in
mile/h
.

F02
FLFL
wheelspeed
Wheel
speed
detected
by
the
FL
ABS
sensor
is
Possible
[T9D0]x10
(mile/h)
displayed
in
mile/h
.

F03
RR
RR
wheel
speedWheelspeed
detected
by
the
RR
ABS
sensor
is
possible
[T9E0]*10
(mile/h)
displayed
in
mile/h
.

F04
RLRL
wheel
speed
Wheel
speed
detected
by
the
RL
ABS
sensor
is
possible
[T9F0]*10
(mileJh)
displayed
in
mile/h
.

F05
FRFR
wheelspeed
Wheel
speed
detected
by
the
FR
ABS
sensor
is
possible
[T9C0j*10
(km/h)
displayed
in
km/h
.

F06
FL
FL
wheel
speedWheelspeed
detected
by
the
FL
ABS
sensor
is
possible
[T9D0]*10
(km/h)
displayed
in
km/h
.

F07
RRRR
wheel
speedWheelspeed
detected
by
the
RR
ABS
sensor
is
Possible
[T9E0]*10
(km/h)
displayed
in
km/h
.

F08
RLRL
wheel
speedWheelspeed
detected
by
the
RL
ABS
sensor
is
possible
[T9FO]w10
(km/h)
displayed
in
km/h
.

F09
BLS
Stop
light
switch
Stop
light
switch
monitor
voltage
is
displayed
.
Possible
[T9G0]d10
monitor

G
sensor
output
Refers
to
vehicleacceleration
detecting
by
the
[T9H0]*10
F10
G-SENS
voltage
(V)
analog
G
sensor
.
It
appears
on
theselect
moni-
Possible

for
display
in
volts
.

90

BRAKES
[ABS
5
.31
TYPE]
[T9A3]
4-4d

9
.
Select
Monitor
Function
Mode

2
.
FA
MODE
(ON/OFF
DATA
ARE
DISPLAYED
.)

Function
code
M
it
i
b
i
C
l
Code
Abbreviation
easur
ng
ems
ontents
to
e
mon
toredScrol
Ref
.
to

131
Stop
light
switch
LED
1
comes
on
withthe
switch
on
(with
the

brake
pedal
down)
.

VR
Valve
relay
signal
LED
2
comes
on
withthevalverelay
off
.

MR
Motor
relay
signal
LED
3
comes
on
with
the
motor
on
.

FAO
ATAT
ABS
signal
LED
4
comesonwhen
ABS
control
is
on
.
Possible
[T910]*10

AW
ABS
warning
light
LED
6
comes
on
when
the
warning
light
is
on
.

VM
Valve
relay
monitor
LED
1
comes
on
with
thevalverelay
off
.

MM
Motor
relay
monitor
LED
8
comes
on
when
the
motor
relay
is
on
.

CM
CCM
signal
LED
9
comes
on
when
ABS
control
is
on
.

3
.
FB
MODE
(TROUBLE
CODES
ARE
DISPLAYED
.)

Function
code
M
i
s
easuring
tem
Contents
to
be
monitored
Scroll
Ref
.
to
Code
Abbreviation

D~ALL
A
maximum
of
3
trouble
codes
are
displayed
in

order
of
occurrence
.

D~NEW
The
most
recent
trouble
code
appears
on
the

select
monitor
display
.

FB1
D~MID
Historyoftrouble
The
second
most
recent
trouble
code
appears
Possible
[T10B0]*10codes
is
displayed
.
on
the
select
monitor
display
.

D~OLDThe
third
most
recent
trouble
code
appears
on

the
select
monitor
display
.

D~REF
A
specified
period
of
time
proceeding
trouble

code
appears
on
the
select
monitor
display
.

Do
*a*
22?(FB1)

FR
.
SS
SOFT

84M0919

NOTE
:

9
If
a
particular
trouble
code
is
notproperly
stored
in

memory
(due
to
a
drop
in
ABSCM&H/U
power
supply,
etc
.)

when
a
problem
occurs,
the
trouble
code,
followed
bya

question
mark
"?",
appears
on
the
select
monitor
display
.

This
shows
it
may
be
an
unreliable
reading
.

9*
a*
refers
to
the
troubles
in
order
of
occurrence
(NEW
.

MID,
OLD
and
REF)
.

91

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

9
.
Select
Monitor
Function
Mode

4
.
FC
MODE
(TROUBLE
CODES
ARE
ERASED
.)

Function
code

Code
Abbreviation
Measuring
items
Contents
to
be
monitored
Scroll
Ref
.
to

Historyoftrouble
FCOD~CLR
Function
of
clearing
trouble
code
.
Possible
[T9J0]*10
codes
is
erased
.

5
.
FD
MODE
(ABS
SEQUENCE
CONTROL
MODE)

Function
code
M
i
Code
Abbreviation
easurng
items
Contents
to
be
monitored
Scroll
Ref
.
to

FD1A~CHK
ABS
sequence
con-
Perform
ABS
sequence
control
by
operating
impossible
4-4

tral
valve
and
pump
motor
sequentially
.
[W25D2]*10
6
.
FE
MODE
(FREEZE
FRAME
DATA)

NOTE
:

9
Data
stored
at
the
time
of
trouble
occurrence
is
shown

on
display
.

Each
time
trouble
occurs,
the
latest
information
is

stored
in
the
freeze
frame
data
in
memory
.

Function
code
Measuring
items
Contents
to
be
monitored
Scroll
Ref
.
to
Code
Abbreviation

FE1
FR
FR
wheel
speedWheelspeed
detected
by
the
FR
ABS
sensor
is
possible
[T9K0]*10
(milelh)
displayed
in
mile/h
.

FE2
FL
FL
wheelspeed
Wheelspeed
detected
by
the
FL
ABS
sensor
is
possible
[T9L0]*10
(mile/h)
displayed
in
mile/h
.

FE3
RRRR
wheelspeed
Wheelspeed
detected
by
the
RR
ABS
sensor
is
possible
[T9MO]*10
(milelh)
displayed
in
mite/h
.

FE4
RLRL
wheel
speedWheel
speed
detected
by
the
RL
ABS
sensor
is
possible
[T91V0]*10
(mile/h)
displayed
in
mite/h
.

FE5
FRFR
wheel
speedWheelspeed
detected
by
the
FR
ABS
sensor
is
possible
[T9K0]fr10
(km/h)
displayed
in
km/h
.

FE6
FL
Ft
wheel
speed
Wheel
speed
detected
by
the
FL
ABS
sensor
is
Possible
[T9L0]~10
(km/h)
displayed
in
km/h
.

FE7
RRRR
wheel
speed
Wheel
speed
detected
by
the
RR
RBS
sensor
is
possible
[T9M0]*10
(km/h)
displayed
in
km/h
.

FE8
RLRL
wheel
speedWheelspeed
detected
by
the
RL
ABS
sensor
is
possible
[T9N0]t`r10
(km/h)
displayed
in
km/h
.

FE13
POWER
ABSCM&H/U
power
Power
(in
volts)
supplied
to
ABSCM&H/U
Possible
[T900]*10
supply
voltage
(V)
appears
on
the
select
monitor
display
.

G
sensor
output
Refers
to
vehicleacceleration
detected
by
the

FE14
G-SENS
voltage
(V)
analog
G
sensor
.
It
appears
on
the
select
moni-
Possible
[T9P0]*10

for
display
in
volts
.

MM
Motor
relay
monitor
LED
1
comes
on
when
motor
relay
is
on
.

131
Stop
light
switch
LED
2
comes
on
with
the
stop
light
switch
on
(with
the
brakepedal
depressed)
.
FE15
ATAT
ABS
signal
LED
3
comes
an
when
ABS
control
is
on
.
Possible
[T9Q0]~10

CM
CCM
signal
LED
4
comes
on
when
ABS
control
is
on
.

AO
ABS
control
LED
5
comes
on
when
ABS
control
is
on
.

FE16
CODE
trouble
code
The
most
recent
trouble
code
appears
on
select
Possible
(T9R0]*10
monitor
display
.

92