SUBARU LEGACY 1996 Service Repair Manual

2-7
[T10BOa]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

OBD
(FBI)

P0180


H2M1306

BO
:
DTC
P0180

-
FUEL
TEMPERATURE
SENSOR
A
CIRCUIT

MALFUNCTION
(TNKT)
-

DTC
DETECTING
CONDITION
:

e
Immediately
at
fault
recognition

10801
Connect
Subaru
Select
Monitor
or
the

OBD-11
general
scan
tool,
and
read
data
.

10802
Check
harness
between
fuel
temperature

sensor
and
ECM
connector
.

10B03
Check
harness
between
fuel
temperature

sensor
and
ECM
connector
.

CAUTION
:

After
repair
or
replacement
of
faultyparts,
conduct

CLEAR
MEMORY
and
INSPECTION
MODES
.

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

10

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

WIRING
DIAGRAM
:

B84

ECM

(
,?22
9D

Q

IE

S
.M
.J
.

897
Rt
R15
R57

884
822

12
34
78
3
4
9
17118119120121122123124
25
261271281291301
1
A
?6
41147
52535455
56
57
9
01112
7
71

1

4
1
417576177
1
1
16

(~
Fueltank

:
:
:M[
:EjjFue1
temperature
ss
ensor

-M
FTM
r-,
.M
F112
3
RUSTUP
141516

B2M1015

11

2-7
[T10B01]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

Data
link
connector
-
Subaru
select
monitor
and
BrD-11
general
scan
tool)

Data
link
connector
~(for
Subaru
select
monitor
~onlY)

\~V

82M1016A
I

TNKT
(F44)

20°C
68°F

H2M
1308

TNKT
(F44)

20°C
68°F

H2M1308

CONNECTSUBARU
SELECT
MONITOROR
10801
THE
OBD-II
GENERAL
SCAN
TOOL,
AND

READDATA
.

1)
Turn
ignition
switch
to
OFF
.

2)
Connect
Subaru
Select
Monitor
or
the
OBD-II
general

scan
tool
to
data
link
connector
.

3)
Turn
ignition
switch
to
ON
and
Subaru
Select
Monitor

or
OBD-II
general
scan
tool
switch
to
ON
.

4)
Start
engine
.

5)
Read
data
onSubaru
Select
Monitor
or
OBD-II
general

scan
tool
.

*
Subaru
Select
Monitor

Designate
mode
using
function
key
.

Function
mode
:
F44

9
F44
:
Fuel
temperature
is
indicated
in
"°C"
and
"°F"

CHECK
:
Is
the
value
greater
than
150°C
or
300°F
in

function
mode
F44?

,rES
:
Go
to
step
10802
.

No
:
Go
to
next
CHECK
CHECK
;
Is
the
value
less
than
-40°C
or
-40°F
in
func-

tion
mode
F44?

,rss
:
Go
to
step
10803
.

No
:
Repair
poor
contact
.

NOTE
:

In
this
case,
repair
the
following
:

"
Poor
contact
in
fuel
pump
connector

"
Poor
contact
in
ECM
connector

"
Poor
contact
in
coupling
connector
(B22,
B97
and
R57

"
OBD-II
general
scan
tool

For
detailed
operation
procedures,
referto
the
OBD-

General
Scan
Tool
Instruction
Manual
.

12

II

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[T10B02]
2-7

10
.
Diagnostics
Chart
with
Trouble
Code

Data
link
connector
(for
Subaru
select
monitor
and
OBD-II
general
scan
tool)

I
Data
link
connector
(for
Subaru
select
monitor
only)

B2M1016A

TNKT
(F44)

20°C
68°F

H2M1308

CHECK
HARNESS
BETWEEN
FUELTEM-

10B02
pERATURE
SENSOR
AND
ECM
CONNEC-

TOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Remove
access
hole
lid
.

3)
Disconnect
connector
from
fuel
pump
.

4)
Connect
Subaru
Select
Monitor
or
the
OBD-II
general

scan
tool
to
data
link
connector
.

5)
Turn
ignition
switch
and
Subaru
Select
Monitor
or

OBD-II
general
scan
tool
switch
to
ON
.

6)
Read
data
onSubaru
Select
Monitor
or
the
OBD-II

general
scan
tool
.

9
Subaru
Select
Monitor

Designate
mode
using
function
key
.

Function
mode
:
F44

9
F44
:
Fuel
temperature
is
indicated
in
"°C"
and
"°F"
.

CHECK
:
Is
thevalue
less
than
-40°C
or
-40°F
in
func-

tion
mode
F44?

vES
:
Replace
fuel
temperature
sensor
.

No
:
Repair
short
circuit
in
harness
between
fuel
pump

and
ECM
connector
.

e
OBD-II
general
scan
tool

For
detailed
operation
procedures,
refer
to
the
OBD-

General
Scan
Tool
Instruction
Manual
.

13

I
I

2-7
RyoBOa1
ON-BOARD
DIAGNOSTICS
i1
SYSTEM

10
.
Diagnostics
Chart
with
Trouble
Code

R58

D

~,V
P

B2M0917A
I

R58

B2M0918A
I

CHECK
HARNESSBETWEEN
FUELTEM-
10B03
PERATURE
SENSOR
AND
ECM
CONNEC-

TOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Remove
access
hole
lid
.

3)
Disconnect
connector
from
fuel
pump
.

4)
Turn
ignition
switch
to
ON
.

5)
Measure
voltage
between
fuel
pump
connector
and

chassis
ground
.

CHECK
:
Connector
&
terminal

(R58)
No
.
6
(+)
-
Chassis
ground
(
)
:

Is
thevoltage
more
than4V?

YES
:
Go
to
next
step
6)
.

No
:
Repair
harness
and
connector
.

NOTE
:

In
this
case,
repair
the
following
:

*
Open
circuit
in
harness
between
ECM
and
fuel
pump

connector

"
Poor
contact
in
fuel
pump
connector

"
Poor
contact
in
ECM
connector

"
Poor
contact
in
coupling
connectors(B97
and
R57)

6)
Turn
ignition
switch
to
OFF
.

7)
Measure
resistance
of
harness
between
fuel
pump

connector
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(R58)
No
.
5
-
Chassi

Is
the
resistance
less

,rES
:
Replace
fuel
temperatur

No
:
Repair
harness
andcon

NOTE
:

In
this
case,
repair
the
following

9
Open
circuit
in
harness
betw
e

connector

"
Poor
contact
in
fuel
pump
co

"
Poor
contact
in
ECM
connect

"
Poor
contact
in
coupling
co

R57)

14

s
ground
:

than5
S~?

e
sensor
.

nector
.

en
ECM
and
fuel
pump

nnector

or

nnectors
(B22,
B97
and

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[T10B03]
2-7

10
.
Diagnostics
Chart
with
Trouble
Code

MEMO
:

15

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

10
.
Diagnostics
Chart
with
Trouble
Code

OBD
(FBI)

P0181

H2M1350

BP
:
DTC
P0181

-
FUEL
TEMPERATURE
SENSOR
A
CIRCUIT

RANGE/PERFORMANCE
PROBLEM

(TN
KT
-
F)
-

DTC
DETECTINGCONDITION
:

Two
consecutive
trips
with
fault

10BP1
I
Check
DTC
P0180
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
:

884

ECM

301

S
.M
.J
.

B91
R1
R15R57R58
Fuel
tank

Fuel
temperature
===@H
sensor

884B22

1
U34
U5U
78
U
1
2
34
1711811912012112212312
51
1152211523112152511526113'
68
55
91
1451461471481491501
47
1
01112
1/11/21/31141151761//1781/91601811821631
193142116
U
1121
E
1
23
4
1
b
1
65
3-7
10
1
[49

B2M1015

16

ON-BOARD
DIAGNOSTICS
II
SYSTEM
(T10BP1]
2-7

10
.
Diagnostics
Chart
with
Trouble
Code

CHECK
DTC
P0180
ON
DISPLAY
.

CHECK
:
Does
the
Subaru
select
monitor
or
OBD-11

general
scan
tool
indicate
DTC
P0180?

,rES
:
Inspect
DTC
P0180
using
"10
.
Diagnostics
Chart

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

NOTE
:

In
this
case,
it
is
not
necessary
to
inspect
DTC
P0181
.

No
:
Replace
fuel
temperature
sensor
.

17

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