1996 SUBARU LEGACY Chassis

2-7
trsi31
ON-BOARD
DIAGNOSTICS
II
SYSTEM

8
.
Diagnostics
for
Engine
Starting
Failure

R58
Bog

1
23
2
1
L

11

5
643

D

S2

B2M0526A

,rES
:
Go
to
step
813
.

No
:
Repair
open
circuit
in
fuel
pump
ground
circuit
.

813
I
CHECK
POWER
SUPPLY
TOFUEL
PUMP
.

1)
Turn
ignition
switch
to
ON
.

2)
Measure
voltage
of
power
supply
circuit
between
fuel

pump
connector
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(R58)
No
.
1
(+)
-
Chassis
ground
(
)
:

Is
the
voltage
more
than10
V?

,rES
:
Replace
fuel
pump
.

No
:
Go
to
step
814
.

814
CHECK
HARNESS
BETWEEN
FUEL
PUMP

AND
FUEL
PUMP
RELAY
CONNECTOR
.

1)
Turn
ignition
switch
to
OFF
.

2)
Measure
resistance
of
harness
connector
between
fuel

pump
and
fuel
pump
relay
.

CHECK
:
Connector
&
terminal

(R58)
No
.
1
-
(B46)
No
.
4
:

Is
the
resistance
less
than
1
S2?

,rES
:
Go
to
next
CHECK

No
:
Repair
open
circuit
in
harness
between
fuel
pump

and
fuel
pump
relay
connector
.

CHECK
:
Connector
&
terminal

(R58)
No
.
1
-
Chassis
ground
:

Is
the
resistance
more
than
1
MS2?

,res
:
Go
to
step
815
.

No
:
Repair
short
circuit
in
harness
between
fuel
pump

and
fuel
pump
relay
connector
.

6

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

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

"
Poor
contact
in
coupling
connectors
(B97
and
R57)
"
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
[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

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

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