Page 241 of 2890

2-7
[T10BS1)
ON-BOARD
DIAGNOSTICS
II
SYSTEM
10
.
Diagnostics
Chart
with
Trouble
Code
Data
link
connector
(for
Subaru
select
monitor
and
OBD-II
general
scan
tool)
)
'
~
'~A~
~
Data
link
connector
(for
Subaru
select
monitor
only)
82M1016A]
TNKP
(F43)
0
.
10
k
P
a
1
mmHg
H2M
1326
TNKP
(F43)
0
.
10
k
P
a
1
mmHg
H2M1326
CONNECT
SUBARU
SELECT
MONITOR
OR
10BS1
THE
OBD-II
GENERALSCAN
TOOL,
AND
READ
DATA
.
1)
Turn
ignition
switch
to
OFF
.
2)
Remove
fuel
filler
cap
.
3)
Install
fuel
filler
cap
.
4)
Connect
Subaru
Select
Monitor
or
the
OBD-II
general
scan
toolto
data
link
connector
.
5)
Turn
ignition
switchto
ON
and
Subaru
Select
Monitor
or
the
OBD-II
general
scan
tool
switch
to
ON
.
6)
Read
the
data
onSubaru
Select
Monitoror
the
OBD-II
general
scan
tool
.
o
Subaru
Select
Monitor
Designate
mode
using
functionkey
.
Function
mode
:
F43
o
F43
:
Display
shows
pressure
signal
value
sent
from
fuel
tank
pressure
sensor
.
CHECK
:
Is
the
value
less
than-2
.8
kPa
in
function
mode
F43?
,rES
:
Go
to
step
10BS2
.
No
:
Go
to
next
CHECK
CHECK
:
Is
the
value
more
than2
.8
kPa
in
function
mode
F43?
,rES
:
Go
to
step
10BS4
.
No
:
Repair
harness
and
connector
.
NOTE
:
In
this
case,
repair
the
following
:
9
Open
or
short
circuit
in
harness
between
fuel
tank
p
sure
sensor
and
ECM
connector
"
Poor
contact
in
coupling
connector
(B97)
"
Poor
contact
in
fuel
tank
pressure
sensor
"
Poor
contact
in
ECM
connector
"
OBD-II
general
scan
tool
For
detailed
operation
procedures,
referto
the
OB
General
Scan
Tool
Instruction
Manual
.
30
res-
D-II
Page 242 of 2890
![SUBARU LEGACY 1996 Service Repair Manual
ON-BOARD
DIAGNOSTICS
II
SYSTEM
[TIossz]
2-7
10
.
Diagnostics
Chart
with
Trouble
Code
TNKP
(F43)
0
.
10
k
P
a
1
mmHg
H2M
1326
CHECK
INPUT
SIGNAL
FOR
ECM
.
(USING
10BS2
VOLTAGE
METER
AND
SUBARU
SEL SUBARU LEGACY 1996 Service Repair Manual
ON-BOARD
DIAGNOSTICS
II
SYSTEM
[TIossz]
2-7
10
.
Diagnostics
Chart
with
Trouble
Code
TNKP
(F43)
0
.
10
k
P
a
1
mmHg
H2M
1326
CHECK
INPUT
SIGNAL
FOR
ECM
.
(USING
10BS2
VOLTAGE
METER
AND
SUBARU
SEL](/manual-img/17/57433/w960_57433-241.png)
ON-BOARD
DIAGNOSTICS
II
SYSTEM
[TIossz]
2-7
10
.
Diagnostics
Chart
with
Trouble
Code
TNKP
(F43)
0
.
10
k
P
a
1
mmHg
H2M
1326
CHECK
INPUT
SIGNAL
FOR
ECM
.
(USING
10BS2
VOLTAGE
METER
AND
SUBARU
SELECT
MONITOR
.)
1)
Measure
voltage
between
ECM
connector
and
chassis
ground
.
CHECK
;
Connector
&
terminal
(884)
No
.
21
(+)
-
Chassis
ground
(
)
:
Is
the
voltage
more
than4
.5
V?
YES
:
Go
to
nextstep
2)
.
No
:
Go
to
next
CHECK
CHECK
:
Does
the
voltage
change
more
than
4
.5
Vby
shaking
harness
and
connector
of
ECM
while
monitoring
the
value
with
voltage
meter?
0
:
Repairpoorcontact
in
ECM
connector
.
No
:
Replace
ECM
.
2)
Measure
voltage
between
ECM
and
chassis
ground
.
CHECK
:
Connector
&
terminal
(B84)
No
.
4
(+)
-
Chassis
ground
(
)
:
Is
the
voltage
less
than
0
.2
V?
,mss
:
Go
to
step
10BS3
.
No
:
Go
to
next
step
3)
.
3)
Read
data
onSubaru
Select
Monitor
.
9
Subaru
Select
Monitor
Designate
mode
using
function
key
.
Function
mode
:
F43
9
F43
:
Display
shows
pressure
signal
value
sent
from
fuel
tankpressure
sensor
.
31
Page 243 of 2890
![SUBARU LEGACY 1996 Service Repair Manual 2-7
[T1oBS3]
ON-BOARD
DIAGNOSTICS
II
SYSTEM
10
.
Diagnostics
Chart
with
Trouble
Code
CHECK
:
Does
the
value
change
more
than
-2
.8
kPa
by
shaking
harness
and
connector
of
ECM
while
monitoring
the
SUBARU LEGACY 1996 Service Repair Manual 2-7
[T1oBS3]
ON-BOARD
DIAGNOSTICS
II
SYSTEM
10
.
Diagnostics
Chart
with
Trouble
Code
CHECK
:
Does
the
value
change
more
than
-2
.8
kPa
by
shaking
harness
and
connector
of
ECM
while
monitoring
the](/manual-img/17/57433/w960_57433-242.png)
2-7
[T1oBS3]
ON-BOARD
DIAGNOSTICS
II
SYSTEM
10
.
Diagnostics
Chart
with
Trouble
Code
CHECK
:
Does
the
value
change
more
than
-2
.8
kPa
by
shaking
harness
and
connector
of
ECM
while
monitoring
the
value
with
Subaru
select
monitor?
,rES
:
Repair
poor
contact
in
ECM
connector
.
No
:
Go
to
step
10BS3
.
B2M0927
R47
1z
a
L
E
H2M1255B
I
CHECK
HARNESS
BETWEEN
ECMAND
10BS3
FUEL
TANK
PRESSURE
SENSOR
CONNEC-
TOR
.
1)
Turn
ignition
switch
to
OFF
.
2)
Detach
right
siderear
quarter
trim
panel
.
3)
Remove
right
siderear
quarter
trim
pocket
.
4)
Detach
right
siderear
quarter
insulator
.
5)
Disconnect
connector
from
fuel
tank
pressure
sensor
.
6)
Turn
ignition
switch
to
ON
.
7)
Measure
voltage
between
fuel
tank
pressure
sensor
connector
and
chassis
ground
.
CHECK
;
Connector
&
terminal
(R47)
No
.
3
(+)
-
Chassis
ground
(
)
:
Is
thevoltage
more
than
4
.5
V?
vES
:
Go
to
nextstep
8)
.
*
Open
circuit
in
harness
between
ECM
and
fuel
tank
pressure
sensor
connector
e
Poor
contact
in
coupling
connector
(B97)
No
:
Repair
harness
and
connector
.
NOTE
:
In
this
case,
repair
the
following
:
32
Page 244 of 2890
ON-BOARD
DIAGNOSTICS
II
SYSTEM
[TIoBSa]
2-7
10
.
Diagnostics
Chart
with
Trouble
Code
8)
Turn
ignition
switch
to
OFF
.
9)
Disconnect
connector
from
ECM
.
10)
Measure
resistance
of
harness
between
ECM
and
pressure
sensor
connector
.
CHECK
:
Connector&
terminal
(B84)
No
.
4
-
(R47)
No
.
2
:
Is
the
resistance
less
than
1
09
YES
.
Go
to
next
CHECK
,
No
:
Repair
harness
and
connector
.
NOTE
:
In
this
case,
repair
the
following
:
9
Open
circuit
in
harness
between
ECM
and
fuel
tank
pressure
sensor
connector
9
Poor
contact
in
coupling
connector
(B97)
CHECK
:
Connector
&
terminal
(884)
No
.
20
-
(R47)
No
.
1
:
Is
the
resistance
less
than
1
S2?
,res
:
Go
to
next
step
11)
.
No
:
Repair
harness
and
connector
.
NOTE
:
In
this
case,
repair
the
following
:
e
Open
circuit
in
harness
between
ECM
and
fuel
tank
pressure
sensor
connector
9
Poor
contact
in
coupling
connector
(B97)
33
Page 245 of 2890
2-7
IT10BS4]
ON-BOARD
DIAGNOSTICS
II
SYSTEM
10
.
Diagnostics
Chart
with
Trouble
Code
H2M1257B
I
82M0927
11)
Measure
resistance
of
harness
between
fuel
tank
pressure
sensor
connector
and
chassis
ground
.
CHECK
:
Connector
&
terminal
the
kW
CHECK
:
Is
there
poor
contact
in
fuel
tank
pressure
sensor
connector?
vES
:
Repair
poor
contact
in
fuel
tank
pressure
sensor
connector
.
Replace
fuel
tank
pressure
sensor
.
No
:
(R47)
No
.
1
-
Chassis
ground
:
Is
resistance
more
than
500
Go
to
next
CHECK
No
:
Repair
short
circuit
in
harness
between
ECM
and
fuel
tank
pressure
sensor
connector
.
CHECK
HARNESS
BETWEEN
ECM
AND
10BS4
FUEL
TANK
PRESSURE
SENSOR
CONNEC-
TOR
.
1)
Turn
ignition
switch
to
OFF
and
Subaru
Select
Moni-
tor
or
the
OBD-II
general
scan
tool
switch
to
OFF
.
2)
Detach
right
siderear
quarter
trim
panel
.
3)
Remove
right
siderear
quarter
trim
pocket
.
4)
Detach
right
siderear
quarter
insulator
.
34
Page 246 of 2890
ON-BOARD
DIAGNOSTICS
II
SYSTEM
[TloBSa1
2-7
10
.
DiagnosticsChart
with
Trouble
Code
TNKP
(F43)
0
.
10
k
P
a
1
mmHg
H2M1326
5)
Disconnect
connector
from
fuel
tank
pressure
sensor
.
6)
Remove
fuel
filler
cap
.
7)
Install
fuel
filler
cap
.
8)
Turn
ignition
switchto
ON
and
Subaru
Select
Monitor
or
theOBD-II
general
scan
tool
switch
to
ON
.
9)
Read
data
onSubaru
select
monitor
or
the
OBD-II
gen-
eral
scan
tool
.
e
Subaru
Select
Monitor
Designate
mode
using
function
key
.
Function
mode
:
F43
CHECK
:
Is
the
value
more
than2
.8
kPa
in
function
mode
F43?
,rES
:
Repair
short
circuit
in
harnessbetween
ECM
and
fuel
tank
pressure
sensor
connector
.
No
:
Replace
fuel
tankpressure
sensor
.
~
OBD-II
general
scan
tool
For
detailed
operation
procedures,
referto
the
OBD-II
General
Scan
Tool
Instruction
Manual
.
35
Page 247 of 2890
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
Page 248 of 2890
ON-BOARD
DIAGNOSTICS
II
SYSTEM
[T1oBT11
2-7
10
.
DiagnosticsChart
with
Trouble
Code
(CHECK
PRESSURE/VACUUM
LINE
.
Is
therea
fault
in
pressurelvacuum
line?
NOTE
:
Check
the
following
items
.
9
Disconnection,
leakage
and
clogging
of
the
vacuum
hoses
and
pipes
between
fuel
tank
pressure
sensor
and
fuel
tank
e
Disconnection,
leakage
and
clogging
of
air
ventilation
hoses
and
pipes
between
fuel
filler
pipe
and
fuel
tank
vES
:
Repair
or
replace
hoses
and
pipes
.
No
:
Replace
fuel
tankpressure
sensor
.
37