sensor SUBARU LEGACY 1996 Service Repair Manual

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

ON-BOARD
DIAGNOSTICS
11
SYSTEM
[TIoBwB]
2-7
10
.
DiagnosticsChart
with
Trouble
Code

R58

B2M0938A
I

R58

B2M0939A
I

10BW7
CHECK

I
SENSOR
.

ROUND
CIRCUIT
OF
FUEL
LEVEL

Measure
resistance
of
harness
between
fuel
pump
con-

nector
and
chassis
ground
.

CHECK
:
Connector
&
terminal
(R58)
No
.
5
-
Chassis
ground
:

Is
the
resistance
less
than
5
92?

YES
:
Go
to
step
10BW8
.

No
:
Repair
harness
and
connector
.

NOTE
:

In
this
case,
repair
the
following
:

9
Open
circuit
in
harness
between
fuel
pump
connector

and
chassis
grounding
terminal

"
Poor
contact
in
fuel
pump
connector

"
Poor
contact
in
coupling
connectors
(R57,
B97and

B22)

1OBW8
CHECK
HARNESS

(FUEL
PUMP
CONNECTOREN

ECM
AND

1)
Connect
connector
to
fuel
sub
meter
unit
.

2)
Turn
ignition
switch
to
ON
.

3)
Measure
voltage
between
fuel
pump
connector
and

chassis
ground
.

CHECK
:
Connector
&
terminal
(R58)
No
.
3
(+)
-
Chassis
ground
(
)
:

Is
thevoltage
less
than
1
V?

Repair
harness
and
connector
.

NOTE
:

In
this
case,
repair
the
following
:

*
Open
circuit
in
harness
between
fuel
pump
connector

and
junction
A
on
rear
wiring
harness

"
Poor
contact
in
fuel
sub
meter
unit
connector

"
Poor
contact
in
fuel
pump
connector

"
Poor
contact
in
coupling
connector
(R57)

No
:
Go
to
nextstep
4)

51

2-7
RyoBxo]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
DiagnosticsChart
with
Trouble
Code

OBD
(
F
B
1)

EXERR22

B2M0947

BX
:
DTC
P0461

-
FUEL
LEVEL
SENSOR
CIRCUIT
RANGE/

PERFORMANCEPROBLEM
(EXERR22)
-

DTC
DETECTING
CONDITION
:

Two
consecutive
trips
with
fault

10BX1
Check
DTC
P1402
on
display
.

CAUTION
:

After
repair
or
replacement
of
faultyparts,
conduct

CLEAR
MEMORY
and
INSPECTION
MODES
.

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

WIRING
DIAGRAM
:

a
:
(a)

b
:
i11
meter
Ignitionc
:
i14
B72
switch
No
.15
~
SBF-4
F
L
1
.25B
rill-fY~
f1
M
~^1-
~
.c
JL

S
.M
.J
.

O
O
897
R1

EW

8T2

1234

4U

i10i12

4
9
10
1
121
141
1

_
.
u

Fuel
pump
ASSY

R58
Fuellevel
r,r,
sensor
Fuel
sub
meter
unit

R59
Fuel.sub

R5787TR59

4W~!JJ
141~1b1

O
R5B

1
1
141~Ib1

82M1021

56

6-3
[Dso2]
WIRING
DIAGRAM

6
.
Wiring
Diagram

a
:
B54

b
:
BSS

c
:
B56

Transmission
:control
module

853

Shield
joint
connector
Lz7-

E3
822

E2821

-(California
model)

GEB3

Mass
aIr
flow
sensor
C
:
i14
il
B36

Comb
i
net
i
on
~?+
BRBR
meter

B76
Test
mode
connector

8l2

Inhibitorswitch

(
&
CD
Transmission
4

Vehicle
l
speed
-
sensor
1

B84

19

Engine
control
module

(
ED
~i
gnitor

B79
~
Chec
k
connector

(
9
)
.
eta
link
connector
S
.
M
.
J
.
[Refer
to
foldout
page
.]

OBD-II
B40
B97
R1
R(5R57
~8

Service
R
,EjeRO
FueI
pump
&
connector
1
-fuel
gauge
module

B76
(GreeN
853B3(G
ray)
Bl3
(Gray)
R58
R57878
(Ye
II
ow)
854
B
lack)

nT
456
4567856789
789012
1234
12345
123456

812
(Gray)
Bll
(Gray)

82l
(L
I
ght
i
14879
(Gray)
822
CL
1
ght
855
(B
I
ac
k)840
(Gray)
gray)
gray)

1234
1234
5678
12345678
7
8
1
9
1
10
1
11
1
124
12345678910111213
8
9
0
l
2
3l4
3l41S16
9
OL31123~ISlb
91001213141516

856
(B
I
ac
k)
i1
B
I
ac
k>
BB4
(L
(
ght
b
I
ue)

12
34
U
56
U
78
UU
9t0
U
1112
U
13141J1
516
1718
1
19
1
20
1
21
1
2223242S
I
26
27282930
3132
1
33
1
34
1
35
1
36
3738
39
40
4142
4344

11
1121314
5
6
78
9
l
01
2
3
456
7
8
9
l0
45
1
46
1
47
1
48
1
49
50
5152
1
53
1
54
1
55
1
56
1
57
1
58
5960
6162
636465
66
6768
64
70

11l2
t
3
(4151617
l8l9
20
l1
1
12
1
l3
1
14
1
15
1
16
1
1
7l8l9
20
2122
7172
7374
75767778
74
B0
8182
3
84
B58687888990
9192
9394
95
96

BUR04-03C

4

6-3
IDso1a1
WIRING
DIAGRAM

6
.
Wiring
Diagram

R57R15

Combination
meter
To
Power
Supply
Routing

FB-20
MB-3FB-4
ST
FB-22Check
Tachometer
connector
FUSE
Na
15
S8F-2
FUSE
Na
16
[G
519
FUSE
Na
l5
P
v

1-0
B79
CD
:
bm
rI
a
m

~
~
F45
Malfunction
Q
D
:
C

indicator
,
.
862
lamp
7

Speedometer
B
i
circuit

I11

*c~
)
Main
relay
E

o
B47
=
Twisted
wire

=2
R
0
F-0
0-
<
71

846
E

Fuel
pump
relay
"
>-
3z
M
~`
LL
J
C
A
V
mJ
(7

Fue
I
pump
&
~
MM~mVPPP
-+
fuel
gauge
module
~
Jv
Fue
I
S
.
M
.
J
.
mJ
B97
3
Engine
pump
[Refer'
to
a
1,
B17
control
B84
module
foldout
page
.],
JJ
Rl
~/
m
L
C

O

R

Fuel
ix
J
temperature
R67R46
sensor
u
Vehicle
=
speed
'
rr
sensor
D
Fuel
gauge
~
r
Inhibitor
switch
n

R59

Fue
I
gauge
C~
sub
module

R59
R67R68

B17

(B
lack)

12
2
12
C

i14

111213141516171819110111112113

((
9
)
5
1

F1F1
Pressure
Vent
controlcontrol
solenoid
solenoi
valvevalve

R69
OD
846
R47
(Green)

U
:Z~)
123
~
34

13
.
ENGINE
ELECTRICAL
SYSTEM

R47

F-1
Fuel
tank
d
pressure
sensor

(Brown)

M
F1F2-1

'
2
3
[3141
456
1516

(L
I
ght
gray)
i
10
(
2D
(L
i
ght
gray)

12345678910111213(41516

B12
R57B12

(Gray)

1234
12
3
5678
45678
9101112

F45
B79

(Gray)

1
23
45
67
89
IO
1t
12
1314

(2i3
(Brown)

23456789
12345
678910
1111213141516171819201
[t
1
1
12
1
13
1
14
1
15
1
16
1
17
1
18
1
19
1
20
21
1
99
1

BUR10-03A

6