1996 SUBARU LEGACY Ecu

2-7
R1oBOO]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

OBD
(FBI)

P0440


H2M1365

BQ
:
DTC
P0440

-
EVAPORATIVE
EMISSION
CONTROL

SYSTEM
MALFUNCTION
(EVAP)
-

DTC
DETECTING
CONDITION
:

Two
consecutive
trips
with
fault

TROUBLE
SYMPTOM
:

Gasoline
smell

10BQ1
Check
any
other
OTC
(besides
OTC

P0440)
on
display
.

10B02
Check
fuel
filler
capand
fuel
filler
pipe
.

10B03Check
vent
control
solenoid
valve
.

10B04
Check
purge
control
solenoid
valve
.

10805
Check
pressure
control
solenoid
valve
.

10B06
Check
evaporative
emission
control

system
line
.

CAUTION
:

After
repair
or
replacement
of
faulty
parts,
conduct

CLEAR
MEMORY
and
INSPECTION
MODES
.

c
Ref
.
to
2-7
[T3D0]
and
[T3E0]
.*2
and
*4
>

18

ON-BOARD
DIAGNOSTICS
II
SYSTEM
ITyoso2i
2-7
10
.
DiagnosticsChart
with
Trouble
Code

WIRING
DIAGRAM
:

Main
relay
0

0

847

884

77
ECM

V

897
R69
S
.M
.J
.
~°c~

Vent
control
solenoid
valve
R68
R57R15

Pressure
control

862F45
SBF-2
O~C)-

B
~E

822
O
E4

Purge
control
solenoid
valve

--{~J

solenoid
valve
B84R68
R69
R57847
822
E4

1
U
49
10
11
1
1314
1
16
1
234
171
1
811
9
12012112212
1113
63
1
36
44
444

M56

5678
49
1
63
55116
68
/Ul
1
3
9101112
9
19
~Lltu
~
4L_L51bIJ~l
13141516

B2M1017

10BQ1
I
CHECK
ANY
OTHER
DTC
(BESIDES
DTC

P0440)
ON
DISPLAY
.

Is
there
any
other
DTC
on
display?

Inspect
the
relevant
DTC
using
"10
.
Diagnostics

Chart
with
Trouble
Code,
2-7
[T10A0]"*7
.

No
:
Go
to
step
101302
.

FILLER
PIPE
.

FILLER
CAPAND
FUEL

1)
Turn
ignition
switch
to
OFF
.

2)
Open
the
fuelflap
.

CHECK
:
Is
the
fuel
filler
cap
tightened
securely?

Tighten
fuel
filler
cap
securely
.

o
:
Go
to
next
CHECK
.

19

2-7
RyoBOS1
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

J

-Test
mode
connector

B2M0432B

--

Vent
control
solenoid
valve

82M0925A

o

Pur
e
control
z----_
11
r
1
4
,1

~
~

solenoidvalve
L

OBD0025B
I

CHECK
:
Is
there
any
damage
to
the
seal
between
fuel

filler
cap
and
fuel
filler
pipe?

Repair
or
replace
fuel
filler
cap
and
fuel
filler
pipe
.

No
:
Go
to
step
111011303
.

CHECK
VENT
CONTROL
SOLENOID
VALVE
.

1)
Connect
test
mode
connector
.

2)
Turn
ignition
switch
to
ON
.

CHECK
:
Does
vent
control
solenoid
valve
produce

*

Go
to
step
10BQ4
.

No
:
Replace
vent
control
solenoid
valve
.

operating
sound?

NOTE
:

Vent
control
solenoid
valve
operation
check
can
also
be

executed
using
Subaru
Select
Monitor
(Function
mode
:

FD08)
.
For
the
procedure,
referto
"COMPULSORY
VALVE

OPERATION
CHECK
MODE"
2-7
[T3F0]
4
.

10B04
CHECK
I
VA
L
VE
.

PURGE
CONTROL
SOLENOID

Does
purge
control
solenoid
valve
produce

operating
sound?

NOTE
:

Purge
control
solenoid
valve
operation
check
can
also
be

executed
using
Subaru
Select
Monitor
(Function
mode
:

FD02)
.
For
the
procedure,
referto
"COMPULSORY
VALVE

OPERATION
CHECK
MODE"
2-7
[T3F0]*4
.

YES
:
Go
to
step
10BQ5
.

No
:
Replace
purge
control
solenoid
valve
.

20

ON-BOARD
DIAGNOSTICS
11
SYSTEM
[T10BQ6]
2-7

10
.
Diagnostics
Chart
with
Trouble
Code

U

Pressure
control
solenoid
valve

B2M0923B

1OB105
CHECK

(VALVE
.

PRESSURE
CONTROL
SOLENOID

Does
pressure
control
solenoid
valve
pro-

duce
operating
sound?

NOTE
:

Pressure
control
solenoid
valve
operation
check
can
also

beexecuted
using
Subaru
Select
Monitor
(Function
mode
:

FD07)
.
For
the
procedure,
refer
to
"COMPULSORY
VALVE

OPERATION
CHECK
MODE"
2-7
[T3F0]*4
.

0
:
Go
to
step
1011306
.

No
:
Replace
pressure
control
solenoid
valve
.

10B06
I
CHECK
EVAPORATIVE
EMISSION
CONTROL

SYSTEM
LINE
.

vES
:
Repair
or
replace
fuel
tank
.

o
;
Go
to
next
CHECK

CHECK
:
Are
there
holes,
cracks,
clogging
or
discon-

nections
of
hoses
or
pipes
in
evaporative

emission
control
system?

vES
:
Repair
or
replace
hoses
or
pipes
.

No
:
Contact
with
SOA
service
.

NOTE
:

Inspection
by
DTM
is
required,
because
probable
cause
is

deterioration
of
multiple
parts
.

Repair
or
replace
canister
.

o
:
Go
to
next
Ei~~
-

CHECK
:
Is
there
any
damage
atfuel
tank?

Turn
ignition
switch
to
OFF
.

CHECK
:
Does
fuel
leak
in
fuel
line?

,rES
:
Repair
or
replace
fuel
line
.

o
:
Go
to
next
E~~
-

CHECK
:
Is
there
any
damage
at
canister?

21

2-7
[T10BR0]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

OBD
(FBI)

P
044
6


H2M1368

BR
:
DTC
P0446

-
EVAPORATIVE
EMISSION
CONTROL

SYSTEM
VENT
CONTROL
MALFUNCTION

(VCMSOL)
-

DTC
DETECTING
CONDITION
:

Two
consecutive
trips
with
fault

10BR1Check
output
signal
from
ECM
.

10BR2
Check
harnessbetween
ventcontrol

solenoid
valve
and
ECM
connector
.

10BR3Check
harness
between
vent
control

solenoid
valve
and
ECM
connector
.

10BR4
Check
ventcontrol
solenoid
valve
.

10BR5Checkpower
supply
to
vent
control

solenoid
valve
.

CAUTION
:

After
repair
or
replacement
of
faultyparts,
conduct

CLEAR
MEMORY
and
INSPECTION
MODES
.

Ref
.
to
2-7
[T3D0]
and
[T3E0]
.*2
and
*4
>

22

2_7
[T10BT0]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

OBD
(FBI)

P0451


H2M
1377

BT
:
DTC
P0451

-
EVAPORATIVE
EMISSION
CONTROL

SYSTEM
PRESSURE
SENSOR

RANGE/PERFORMANCE
PROBLEM

(TNKP
-
F)
-

DTC
DETECTING
CONDITION
:

Two
consecutive
trips
with
fault

I
1OBT1
I
Check
pressure/vacuum
line
.

CAUTION
:

After
repair
or
replacement
of
faultyparts,
conduct

CLEAR
MEMORY
and
INSPECTION
MODES
.

c
Ref
.
to
2-7
[T3D0]
and
[T3E0]
.*2
and
*4
>

WIRING
DIAGRAM
:

S.M
.J
.

B84897
Ri
R47

Fuel
tankpressure
sensor
ECM

L,

884R47

u
u
u
su
1
71
18
1
1
91201211
2
212312412512612712
8
1
2
913011
78
5
go
8T7T
72
444
44
17374759
7
7
123

82M1019

36

2_7
[T1oBUO1
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

OBD
(FBI)

P1400


H2M
1406

BU
:
DTC
P1400

-
FUEL
TANK
PRESSURE
CONTROL

SOLENOID
VALVE
CIRCUIT
MALFUNCTION

(PCVSOL)
-

DTC
DETECTING
CONDITION
:

Two
consecutive
trips
with
fault

10131
.11
Check
output
signal
from
ECM
.

I

10BU2
Check
harness
between
fuel
tank

pressure
control
solenoid
valve
and
ECM

connector
.

1081
.13

Check
harness
between
fuel
tank

pressure
control
solenoid
valve
and
ECM

connector
.

10BU4Check
fuel
tank
pressure
control

solenoid
valve
.

10BU5Checkpower
supply
to
fuel
tank

pressure
control
solenoid
valve
.

CAUTION
:

After
repair
or
replacement
of
faultyparts,
conduct

CLEAR
MEMORY
and
INSPECTION
MODES
.

<
Ref
.
to
2-7
[T3D0]
and
[T3E0]
.*2
and
*4
>

38

2-7
[T1
oBVO1
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

OBD
(FBI)

P1401

H21
M1410

BV
:
DTC
P1401

-
FUEL
TANK
PRESSURE
CONTROL
SYSTEM

FUNCTION
PROBLEM
(PCV
-
F)
-

DTC
DETECTING
CONDITION
:

Two
consecutive
trips
with
fault

10BV1
Check
fuel
tank
pressure
control

solenoid
valve
.

CAUTION
:

After
repair
or
replacement
of
faulty
parts,
conduct

CLEAR
MEMORY
and
INSPECTION
MODES
.

<
Ref
.
to
2-7
[T3D0]
and
[T3E0]
.*2
and
*4
>

WIRING
DIAGRAM
:

Main
relay
0

0

01F
B47861F45
SBF-2
B84

E
E)E)
ECM

ra

Ti

S
.M
.J
.
891
Rt
R15
R57R68
Fuel
tankpressure
control
solenoid
valve

847
R57R68

10
U
1112
U
131401
16

1
131
1
4041424344
1
2
960
6162
63
64
6
-769
69
70
34
1~,~y(3~
8
.04
687
8
99091929
949
96
6
14j5jti1/LtiJ

B2M1020

44