1997 SUBARU LEGACY ECU

4-4d
[TIoM131
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
with
Select
Monitor

10M13
I
CHECK
ABSCM&H/U
.

1)
Turn
ignition
switch
to
OFF
.

2)
Connect
all
connectors
.

3)
Erase
the
memory
.

4)
Perform
inspection
mode
.

5)
Read
out
the
trouble
code
.

CHECK
:
Is
the
same
trouble
codeas
in
thecurrent

diagnosis
still
being
output?

,res
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
10M14
.

10M14
CHECK
ANY
OTHER
TROUBLE
CODES

APPEARANCE
.

CHECK
:
Are
other
trouble
codes
being
output?

0
:
Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporary
poor
contact
.

136

BRAKES
[ABS
5
.31
TYPE]
[T10Q5]
4-4d

10
.
Diagnostics
Chart
with
Select
Monitor

~1004
l
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
to
step
1005
.

CHECK
ANY

APPEARANCE

.THER
TROUBLE
CODES

5
I

Are
other
trouble
codes
being
output?

Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporary
poor
contact
.

141

BRAKES
[ABS
5
.3i
TYPE]
[T10U5]
4-4d

10
.
Diagnostics
Chart
withSelect
Monitor

I
10U4
I
CHECK
ABSCM&H/U
.

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?

,mss
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
10U5
.

10U5
CHECK
ANY
OTHER
TROUBLE
CODES

APPEARANCE
.

CHECK
:
Are
other
trouble
codes
being
output?

Proceed
withthe
diagnosis
corresponding
tothe
trouble
code
.

No
:
A
temporary
poor
contact
.

145

4-4d
[T1
0V0]
BRAKES
[ABS
5
.3i
TYPE]

10
.
Diagnostics
Chart
with
Select
Monitor

D
"
NEW
41
(FBI)

ECU

B4M0962

V
:
TROUBLE
CODE
41
ECU

-
ABNORMAL
ABS
CONTROL
MODULE
-

DIAGNOSIS
:

*
Faulty
ABSCM&H/U

TROUBLE
SYMPTOM
:

*
ABS
does
not
operate
.

WIRING
DIAGRAM
:

F49

ABS
control
module
and
hydrau
l
is
control
unit
E

F49

123456789101112131415

16171819
20
2122
23
24
252627
1
28
1
29
1
30
1
31
1

84M1246

146

4-4d
[T11ova1
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
with
Select
Monitor

1
10Y4
I
CHECK
A7
.

1s
the
AT
functioning
normally?

0
:
Replace
TCM
.

No
:
Repair
AT
.

1
10Y5
I
CHECK
OPEN
CIRCUIT
OFHARNESS
.I

Measure
voltage
between
ABSCM&HlU
connector
and

chassis
ground
.

Connector
&
terminal

(F49)
No
.
3
(+)
-
Chassis
ground

(F49)
No
.
31
(+)
-
Chassis
ground
(
)
:

c~c~c
:
Is
thevoltage
more
than
10V?

Go
to
step
10Y6
.

No
:
Repair
harness/connector
between
AT
control

moduleand
ABSCM&H/U
.

10Y6
CHECK
POOR
CONTACT
IN
CONNECTORS
.

Is
there
poor
contact
in
connectors
between

AT
control
module
and
ABSCM&HIU?
<
Ref
.

to
FOREWORD
[T3CI]
.*10
>

Repair
connector
.

Go
to
step
10Y7
.

I
10Yt
ICHECK
ABSCM&H/U
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3}
Perform
inspection
mode
.

4}
Read
outthe
trouble
code
.

O
:
Is
the
same
trouble
code
as
in
thecurrent

diagnosis
still
being
output?

0
:
Replace
ABSCM&H/U
.

o
:
Go
to
step
10Y8
.

10Y8
CHECK
ANY

I
APPEARANCE

.THER
TROUBLE
CODES

cK
:
Are
other
trouble
codes
being
output?

0
:
Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporary
poor
contact
.

160

BRAKES
[ABS
5
.31
TYPE]
[T10AB4]
4-4d

10
.
Diagnostics
Chart
withSelect
Monitor

00000
E9
c]['~oo
0000000
000000
1313109
130
e

`"/
II
I
F
I
`'B4M1272A

10AB1
CHECK
VALVERELAY
IN
ABSCM&H/U
.

Measure
resistance
between
ABSCM&H/U
terminals
.

Terminals

No
.
23
(+)
-
No
.
24
(
)
:

CHECK
:
Is
theresistance
more
than
1
MS2?

vES
:
Go
to
step
10AB2
.

No
:
Replace
ABSCM&H/U
.
1
10AB2
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.

Is
there
poor
contact
in
connectors
between

generator,battery
and
ABSCM&HIU?
<
Ref
.

to
FOREWORD
[T3C1]
.*10>

vES
:
Repair
connector
.

No
:
Go
to
step
10AB3
.

10AB3
CHECK
ABSCM&H/U
.

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?

0
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
10AB4
.

CODES
I10AB4
CHECK
ANY

IAPPEARANCE
.

O
THER
TROUBLE
CODES

CHECK
;
Are
other
trouble
codes
being
output?

Proceed
withthe
diagnosis
corresponding
to
the
trouble
code
.

No
:
A
temporary
poor
contact
.

171

4-4d
[T1oaca1
BRAKES
[ABS
5
.31
TYPE]

10
.
Diagnostics
Chart
withSelect
Monitor

10AC4
CHECK
POOR
CONTACT
IN
CONNECTORS
.

Turn
ignition
switch
to
OFF
.

CHECK
:
Is
there
poor
contact
in
connector
between

hydraclic
unit,
relay
boxand
ABSCM&HlU?

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

ves
:
Repair
connector
.

No
:
Go
to
step
10AC5
.
1
10AC5
I
CHECK
ABSCM&H/U
.

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?

YES
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
10AC6
.

10AC6
I
CHECK

APPEARANCE

.THER
TROUBLE
CODES

Are
other
trouble
codes
being
output?

Proceed
with
the
diagnosis
corresponding
to
the

trouble
code
.

No
:
A
temporarypoor
contact
.

174

BRAKES
[ABS
5
.31
TYPE]
[T10AE8]
4-4d

10
.
DiagnosticsChart
with
Select
Monitor

1
10AE6
I
CHECK
POOR
CONTACT
IN
CONNECTORS
.

Turn
ignition
switch
to
OFF
.

CHECK
:
Is
there
poor
contact
in
connector
between

generator,
battery
and
ABSCM&HIU?
<
Ref
.

to
FOREWORD
[T3C1]
.*10
>

0
:
Repair
connector
.

No
:
Go
to
step
10AE7
.
1
10AE7
J
CHECK
ABSCM&HlU
.

1)
Connect
all
connectors
.

2)
Erase
the
memory
.

3)
Perform
inspection
mode
.

4)
Read
out
the
trouble
code
.

K
:
Is
the
same
trouble
code
as
in
thecurrent

diagnosis
still
being
output?

,rES
:
Replace
ABSCM&H/U
.

No
:
Go
to
step
10AE8
.

10AE8
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
.

181