SUBARU LEGACY 1996 Service Repair Manual

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
<VCMSOL>

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

ON-BOARD
DIAGNOSTICS
11
SYSTEM
[rIoBROi
2-7

10
.
Diagnostics
Chart
with
Trouble
Code

WIRING
DIAGRAM
:

Main
relay
0
0

B41
B61F45
SBF-2
B84
~

ECM

S
.M
.J
Vent
control
.
solenoid
897
Rt
R15
R57
R69
valve

Canister

O
B47R57
R69

U
910
U
1112
U
1314L11516
3132
3334353637383940
4142
4344
1
2
6162
63
64656667
68
6970
34
1

lu
//j848586
8788
8990
9192
93
949596
56

B2M1018

23

2_7
[T10BR1]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

D

H2M1238A
I

1
10BR1
I
CHECK
OUTPUT
SIGNAL
FROM
ECM
.

1)
Turn
ignition
switch
to
ON
.

2)
Measure
voltage
between
ECM
and
chassis
ground
.

CHECK
:
Connector
&
terminal
(B84)
No
.
35
(+)
-
Chassis
ground
(
)
:

Is
thevoltage
more
than10
V?

,res
:
Go
to
step
10BR2
.

No
:
Go
to
step
10BR3
.

CHECK
HARNESSBETWEEN
VENT
CON-
10BR2
TROL
SOLENOIDVALVE
AND
ECM
CON-

NECTOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connector
from
vent
control
solenoid
valve
.

3)
Turn
ignition
switch
to
ON
.

4)
Measure
voltage
between
ECM
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(B84)
No
.
35
(+)
-
Chassis
ground
(
)
:

Is
thevoltage
more
than
10
V?

,rES
;
Repair
short
circuit
in
harness
and
replace
ECM
.

NOTE
:

The
harness
between
ECM
and
vent
control
solenoid
valve

isin
short
circuit
.

No
:
Go
to
nextstep
5)
.

5)
Turn
ignition
switch
to
OFF
.

6)
Measure
resistance
between
vent
control
solenoid

valve
terminals
.

CHECK
:
Terminals

No
.
1
-
No
.
2
:

Is
the
resistance
lessthan
1
SZ?

Replace
vent
control
solenoid
valve
and
ECM
.

o
:
Go
to
next
CHECK

CHECK
:
Is
there
poor
contact
in
ECM
connector?

ves
:
Repair
poor
contact
in
ECM
connector
.

No
:
Replace
ECM
.

24

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[TIoBRai
2-7
10
.
Diagnostics
Chart
with
Trouble
Code

1
z
R69

L
E

H2M
1239C

SL

H2M1238A
I

CHECK
HARNESSBETWEEN
VENT
CON-
10BR3
TROL
SOLENOID
VALVE
ANDECM
CON-

NECTOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Disconnect
connectors
from
vent
control
solenoid

valve
and
ECM
.

3)
Measure
resistance
of
harness
between
vent
control

solenoid
valve
connector
and
chassis
ground
.

CHECK
:
Connector
&
terminal
(R69)
No
.
2
-
Chassis
ground
:

!s
the
resistance
less
than10
S2?

vES
:
Repair
short
circuit
in
harness
between
ECM
and

vent
control
solenoid
valve
connector
.

No
:
Go
to
nextstep
4)
.

(884)
No
.
35
-
(R69)
No
.
2
:

Is
the
voltage
less
than
1
S2?

,rES
:
Go
to
step
10BR4
.

No
;
Repair
harness
and
connector
.

NOTE
:

In
this
case,
repair
the
following
:

*
Open
circuit
in
harness
between
ECM
and
vent
control

solenoid
valve
connector

9
Poor
contact
in
coupling
connectors
(B97
and
R57)

4)
Measure
resistance
of
harness
between
ECM
and
vent

control
solenoid
valve
connector
.

CHECK
:
Connector
&
terminal

10BR4
CHECK
VENT
CONTROL
SOLENOID
VALVE
.

Measure
resistance
between
vent
control
solenoid
valve

terminals
.

CHECK
:
Terminals

No
.
1
-
No
.
2
:

Is
the
resistance
between
10
and
100
S2?

YES
;
Go
tostep
10BR5
.

No
:
Replace
vent
control
solenoid
valve
.

25

2-7
['r10BR5]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

R69
E
11U2

D

H2M1241C
I

10BR5
CHECK
I
TROL
SOL
NOID

SUPPLY

VALVE,TO

VENT
CON-

1)
Turn
ignition
switch
to
ON
.

2)
Measure
voltage
between
vent
control
solenoid
valve

and
chassis
ground
.

CHECK
:
Connector
&
terminal

(R69)
No
.
1
(+)
-
Chassis
ground
(
)
:

Is
the
voltage
more
than10
V?

Go
to
next
CHECK

No
:
Repair
harness
and
connector
.

NOTE
:

In
this
case,
repair
the
following
:

e
Open
circuit
in
harness
between
main
relay
and
vent

control
solenoid
valve

&#34;
Poor
contact
in
coupling
connectors
(B97
and
R57)
&#34;
Poor
contact
in
main
relay
connector

CHECK
:
Is
there
poor
contact
in
vent
control
solenoid

valve
connector?

vss
:
Repair
poor
contact
in
vent
control
solenoid
valve

connector
.

No
:
Contact
with
SOA
service
.

NOTE
:

Inspection
by
DTM
is
required,
because
probable
cause
is

deteriorationof
multiple
parts
.

26

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[-rlosRS1
2-7

10
.
DiagnosticsChart
with
Trouble
Code

MEMO
:

27

2_7
[T10BS0]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
DiagnosticsChart
with
Trouble
Code

OBD
(FBI)

P0450
<TNKP>
H2M1372

BS
:
DTC
P0450

-
EVAPORATIVE
EMISSION
CONTROL

SYSTEM
PRESSURE
SENSOR
MALFUNCTION

(TNKP)
-

DTC
DETECTING
CONDITION
:

9
Immediately
atfault
recognition

10BSi
I
Connect
Subaru
Select
Monitor
or
the

OBD-II
general
scan
toot,
and
read
data
.

Check
inputsignal
for
ECM
.
(Using

10BS2
voltage
meter
and
Subaru
Select

Monitor
.)

10BS3
I
Check
harness
between
ECM
and
fuel

tank
pressure
sensor
connector
.

10BS4
Check
harnessbetween
ECM
and
fuel
tank
pressuresensor
connector
.

CAUTION
:

Afterrepair
or
replacement
of
faultyparts,
conduct

CLEAR
MEMORY
and
INSPECTION
MODES
.

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

28

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[T10BS0]
2_7

10
.
Diagnostics
Chart
with
Trouble
Code

WIRING
DIAGRAM
:

S
.M
.J
.

884891
R1
R47

Fuel
tank
pressure
sensor
ECM

75-

884R41

u
uu
u
1
0
11
2
~25101152T4252627
2829
0
4444
61
49
80
1
2

B2M1019

29