1996 SUBARU LEGACY sensor

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

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

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

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

2_7
[T10BW0]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

OBD
(FBI)

P1402


H2M1411

BW
:
DTC
P1402

-
FUEL
LEVEL
SENSOR
CIRCUIT

MALFUNCTION
(FLVL)
-

DTC
DETECTING
CONDITION
:

Two
consecutive
trips
with
fault

108W1
Checkspeedometer
and
tachometer

operation
in
combination
meter
.

Check
ground
circuit
of
combination

meter
.

108W3

Check
inputsignal
for
ECM
.
(Using

voltage
meter
andSubaru
Select

Monitor
.)

10BW4
Check
fuel
level
sensor
.

10BW5
Check
fuel
sub
level
sensor
.

10BW6
Check
harness
between
fuel
pump
and

fuel
sub
meter
unit
connector
.

10BW7
Check
ground
circuit
of
fuel
level
sensor
.

Check
harnessbetween
ECM
and
fuel

pump
connector
.

10BW9

Check
harnessbetween
ECM,

combination
meter
and
fuel
pump

connector
.

10BW10
Check
harness
between
combination

meter
and
fuel
pump
connector
.

108W11
Check
combination
meter
.

CAUTION
:

After
repair
or
replacement
of
faulty
parts,
conduct

CLEAR
MEMORY
and
INSPECTION
MODES
.

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

46

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[TloBw2i
2-7
10
.
Diagnostics
Chart
with
Trouble
Code

WIRING
DIAGRAM
:

a
:
QD
Combination
b
:
i12
meter
Ignition
c
:
i14
No
.
15W2
switch
SBF-4
FL1
.25B

Fuel
gauge

S
.M
.J
.

O
O
E
E)
El)

Fuel
pumpASSY

R58
Fuel
level
sensor

Junction
A

R15R57

ECM
~
Fuel
sub
meter
unit

Fuel
sub
O
~p
level
sensor

E

822

R57
872
R59

1
5
1
6
1
7
1
8
'
,

O
,'
IyWJJ
LJJJ
LJJ

u
4u
1Ju
i10
i~2
117118119~2
.0121122123V4
.
.
.
.
.
.
(D

1
1
1
141
141EIb1

B2M1021

CHECK
SPEEDOMETER
AND
TACHOMETER

(OPERATION
IN
COMBINATION
METER
.

CHECK
:
Does
speedometer
and
tachometer
operate

normally?

vES
:
Go
to
step
10BW3
.

No
:
Go
to
step
10BW2
.

10BW2
I
CHECK
GROUND
CIRCUIT
OFCOMBINA-

TION
METER
.

1)
Turn
ignition
switch
to
OFF
.

2)
Pull
out
combination
meter
from
instrument
panel
.

<
Ref
.
to
6-2
[W13A1
]
.*1
>

3)
Disconnect
connector
from
combination
meter
.

47

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[r1oBwa]
2-7

10
.
Diagnostics
Chart
with
Trouble
Code

FLEVEL
(F45)

2
.50V

H2M1327

3
2
1
5
4

D

S2

B2M0935
I

CHECK
:
Does
the
value
change
less
than
0
.12
Vby

shaking
harness
and
connector
of
ECM
while

monitoring
the
value
with
Subaru
Select

Monitor?

9
Subaru
Select
Monitor
Designate
mode
using
function
key
.

Function
mode
:
F45

9
F45
:
Fuel
level
sensor
output
signal
is
indicated
.

,rES
:
Repair
poor
contact
in
ECM
connector
.

No
:
Even
if
MIL
lights
up,
the
circuit
has
returned
to

a
normal
condition
at
this
time
.
A
temporary
poor

contact
of
the
connector
may
be
the
cause
.

NOTE
:

In
this
case,
repair
the
following
:

"
Poor
contact
in
fuel
pump
connector

"
Poor
contact
in
combination
meter
connector

"
Poor
contact
in
ECM
connector

"
Poor
contact
in
coupling
connector
(i3,
1322,
B97and

R57)

10BW4
CHECK
FUEL
LEVEL
SENSOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Remove
fuel
pump
access
hole
lid
located
on
the
right

rear
of
luggage
compartment
floor
.

3)
Disconnect
connector
from
fuel
pump
.

4)
Measure
resistance
between
connector
terminals
of
fuel
pump
.

CHECK
:
Terminals

No
.
3
-
No
.
5
:

Is
the
resistance
less
than
100
S2?

vES
:
Go
to
step
10BW5
.

No
:
Replace
fuel
sending
unit
.

49

2-7
[T10BW5]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

[2-
1

B2MO9361

R
1
2
34
5

.0
Q
0
.

B2MO937A

I
10BW5
CHECK
FUEL
SUB
LEVEL
SENSOR
.

1)
Remove
service
hole
cover
located
on
the
left
rear
of

luggage
compartment
floor
.

2)
Disconnect
connector
from
fuel
sub
meter
unit
.

3)
Measure
resistance
between
connector
terminals
of
fuel
sub
meter
unit
.

CHECK
;
Terminals

No
.
1
-
No
.
2
:

Is
the
resistance
less
than
100
SZ?

,rES
:
Go
to
step
10BW6
.

No
:
Replace
fuel
sub
meter
unit
.

10BW6
CHECK
HARNESS
FUEL
PUMP
I
I
AND
FUEL
SUB
MET
RWUNIT
CONNECTOR
.

Measure
resistance
of
harness
between
fuel
pump
and

fuel
sub
meter
unit
connector
.

CHECK
:
Connector
&
terminal

(R58)
No
.
3
-
(R59)
No
.
2
:

Is
the
resistance
less
than
1
SZ?

0
:
Go
to
step
10BW7
.

No
:
Repair
open
circuit
in
harness
between
fuel
pump

and
fuel
sub
meter
unit
connector
.

50