engine SUBARU LEGACY 1996 Service Owners Manual

2_7
[T10A0]
ON-BOARD
DIAGNOSTICS
11
SYSTEM
10
.
Diagnostics
Chart
with
Trouble
Code

10
.
Diagnostics
Chart
with
Trouble
Code

A
:
DIAGNOSTIC
TROUBLE
CODE
(DTC)
LIST

DTC

No
.

Abbreviation

(Subaru
select
monitor)Item
Page

P0100
QA
Mass
air
flow
sensor
circuit
malfunction
'1

P0101
QA
-
R
Mass
air
flow
sensor
circuit
range/performance
problem
`1

P0105
P
-
S
Pressure
sensor
circuit
malfunction
*1

P0106
PS
-
R
Pressure
sensor
circuit
range/performance
problem
*1

P0115
TW
Engine
coolant
temperature
sensor
circuit
malfunction
'1

P0120
THV
Throttle
position
sensor
circuit
malfunction
'1

P0121
TH
-
R
Throttle
position
sensor
circuit
range/performance
problem
'1

P0125
TW
-
CL
Insufficient
coolant
temperature
for
closed
loop
fuel
control
'1

P0130
F02
-
V
Front
oxygen
sensor
circuit
malfunction
*1

P0133
F02
-
R
Front
oxygen
sensor
circuit
slowresponse
'1

P0135
F02H
Front
oxygen
sensor
heater
circuit
malfunction
*1

P0136
R02
-
V
Rear
oxygen
sensor
circuit
malfunction
'1

P0139
R02
-
R
Rear
oxygen
sensor
circuit
slowresponse
*1

P0141
R02H
Rear
oxygen
sensor
heater
circuit
malfunction
*1

P0170
FUEL
Fuel
trim
malfunction
'1

P0180
TNKT
Fuel
temperature
sensor
A
circuit
malfunction
10

P0181
TNKT-
FFuel
temperature
sensor
A
circuit
range/performance
problem
16

P0201
INJ1
Fuel
injector
circuit
malfunction
-
#1

P0202
INJ2Fuel
injector
circuit
malfunction
-
#2
"
1
P0203
INJ3Fuel
injector
circuit
malfunction
-
#3

P0204
INJ4Fuel
injector
circuit
malfunction
-
#4

P0301
MIS
-
1
Cylinder
1
misfire
detected

P0302
MIS
-
2Cylinder2
misfire
detected

P0303
MIS
-
3
Cylinder
3
misfire
detected

P0304
MIS
-
4
Cylinder
4
misfire
detected

P0325
KNOCK
Knock
sensor
circuit
malfunction
'1

P0335
CRANK
Crankshaft
position
sensor
circuit
malfunction
'1

P0340
CAM
Camshaft
position
sensor
circuit
malfunction
'1

P0400
EGR
Exhaust
gas
recirculation
flow
malfunction
`1

P0403
EGRSOL
Exhaust
gas
recirculation
circuit
malfunction
'1

P0420
CAT
Catalyst
system
efficiency
below
threshold
'1

P0440
EVAP
Evaporative
emission
control
system
malfunction
18

P0441
CPC
-
F
Evaporative
emission
control
system
incorrect
purge
flow
'1

P0443
CPC
Evaporative
emission
control
system
purge
control
valve
circuit
malfunction
'1

P0446
VCMSOL
Evaporative
emission
control
system
vent
control
malfunction
22

P0450
TNKP
Evaporative
emission
control
system
pressure
sensor
malfunction
28

P0451
TNKP
-
F
Evaporative
emission
control
system
pressure
sensor
range/performance

problem
36

'1
:
.
to
2-7
[T11A0]
.*4>

ON-BOARD
DIAGNOSTICS
11
SYSTEM
[T10A0]
2-7

10
.
Diagnostics
Chart
with
Trouble
Code

DTC

No
.

Abbreviation

(Subaru
select
monitor)Item
Page

P0500
VSP
Vehicle
speed
sensor
malfunction
'1

P0505
ISC
Idle
control
system
malfunction
`1

P0506
ISC
-
L
Idle
control
system
RPM
lower
than
expected
'1

P0507
ISC
-
H
Idle
control
system
RPM
higher
than
expected
'1

P0600
-
Serial
communication
link
malfunction
`1

P0601
RAM
Internal
control
module
memory
check
sum
error
'1

P0703
ATBRK
Brake
switch
input
malfunction
'1

P0705
ATRNG
Transmissionrange
sensor
circuit
malfunction
`1

P0710
ATF
Transmission
fluid
temperature
sensor
circuit
malfunction
'1

P0720
ATVSP
Output
speed
sensor
(vehicle
speed
sensor
1)
circuit
malfunction
'1

P0725
ATNE
Engine
speed
input
circuit
malfunction
'1

P0731
ATGR1
Gear
1
incorrect
ratio

P0732
ATGR2
Gear
2
incorrect
ratio
"
1
P0733
ATGR3
Gear
3
incorrect
ratio

P0734
ATGR4
Gear
4
incorrect
ratio

P0740
ATLU
-
F
Torque
converter
clutch
system
malfunction
1

P0743
ATLU
Torque
converter
clutch
system
electrical
*1

P0748
ATPL
Pressure
control
solenoid
electrical
'1

P0753
ATSFTi
Shift
solenoid
A
electrical
`1

P0758
ATSFT2
Shift
solenoid
B
electrical
'1

P0760
ATOVR
-
F
Shift
solenoid
C
malfunction
'1

P0763
ATOVR
Shift
solenoid
C
electrical
'1

P1100
ST-SW
Starter
switch
circuit
malfunction
'1

P1101
N/P
-
SW
Neutral
position
switch
circuit
malfunction
[MT
vehicles]
'1

P1101
N/P
-
SW
Neutral
position
switch
circuit
malfunction
[AT
vehicles]
1

P1102
BR
Pressure
sources
switching
solenoid
valve
circuit
malfunction
'1

P1103
TRQ
Engine
torque
control
signal
circuit
malfunction
`1

P1400
PCVSOL
Fueltank
pressure
control
solenoid
valve
circuit
malfunction
38

P1401
PCV
-
FFueltank
pressure
control
system
function
problem
44

P1402
FIVL
Fuel
level
sensor
circuit
malfunction
46

P1500
FAN
-
1
Radiator
fan
relay
1
circuit
malfunction
'1

P1502
FAN
-
F
Radiator
fan
function
problem
'1

P1700
ATTH
Throttle
position
sensor
circuit
malfunction
for
automatic
transmission
'1

P1701
ATCRS
Cruise
control
set
signal
circuit
malfunction
for
automatic
transmission
'1

P1702
ATDIAG
Automatic
transmission
diagnosis
inputsignal
circuit
malfunction
'1

P0461'2
EXERR22
Fuel
level
sensor
circuit
range/performance
problem
56

"1
:
<
Ref
.
to
2-7
[T11A0]
.*4
>

'2
:
Only
OBD-II
general
scan
tool
displays
DTC
.

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

2-7
[-riosw3]
ON-BOARD
DIAGNOSTICS
II
SYSTEM
10
.
Diagnostics
Chart
with
Trouble
Code

i12

1
1
2
1
3
1
4
1
5
1
6
1
789
011
213
4
516

D

[
.0
S2
0i

B2M0934A
I

u
8
7
u
65u
43u21
22
7
52
~
2121
~1
1
91
1
4
1
4
55
:1
B84
15
q
4
4
48
"§~
5
881
i
81771
70
7
51
74
17317217
1
1

D

+v-
H2M1414B

4)
Measure
resistance
of
harness
between
combination

meter
connector
and
chassis
ground
.

CHECK
:
Connector
&
terminal

(i12)
No
.
1
-
Chassis
ground
:

Is
resistance
less
than5
0?

,rEg
:
Repair
or
replace
combinationmeter
.

No
:
Repair
harness
and
connector
.

NOTE
:

In
this
case,
repair
the
following
:

Open
circuit
in
harness
between
combination
meter

connector
and
grounding
terminal

"
Poor
contact
in
combination
meter
connector

"
Poor
contact
in
grounding
terminal

CHECK
INPUT
SIGNAL
FOR
ECM
.
(USING
10BW3
VOLTAGE
METER
AND
SUBARU
SELECT

MONITOR
.)

1
Turn
ignition
switch
t
o
ON
.
(Engine
OFF)

2)
Measure
voltage
between
ECM
connector
and
chassis

ground
.

CHECK
:
Connector
&
terminal

(884)
No
.
27
(+)
-
Chassis
ground
(
)
:

is
thevoltage
more
than4
.75
V?

,rES
:
Go
to
step
10BW4
.

No
:
Go
to
next
step
3)
.

3)
Measure
voltage
between
ECM
connector
and
chassis

ground
.

CHECK
:
Connector
&
terminal

(884)
No
.
27
(+)
-
Chassis
ground
(
)
:

Is
thevoltage
less
than0
.12
V?

,res
:
Go
to
step
lOBW9
.

No
:
Go
to
next
CHECK

48

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

WIRING
DIAGRAM
[D6013]
6-3

6
.
Wiring
Diagram

Data
link
connector
Testmode

878B75
~
B76

YJ
J
~mm
L
J

)
Ref
.
toAir
/
conditioning
system
.

1
Re
f
.to
Radiator
/
fan
system
.

Ref
.
toAT
control
J
system
.

L

F
d'
3L
a0J
mo
O
~VI~
f~
MP

Enginecontro
I
BB4
module

m
>rCD
J3
3

F
.
.
..
--
~
-

S
'
K
J
'
B19
'-
818
v
--
Bl9
rl
CE

r
......

T5
~
..
....

T6

Front
Pressure
sources
oxygen
switchfr
sensor
~
.,
i
o
.,
.

B75
(Green)

2

B78
(Ye
I
low)

12
34
56789

Rear
oxygen
sensor
(California
model)

876
(Green)

2

Rear
oxygensensor
(Other
models)

Bl
(Brown)

12

818
(De
rk
gray)

21
3
OBD-
11
service
connector

N~
BGO

valve

9

(Gray)
T6
Bl9

21
43

840
(Gray)
B84
(L
1
ght
b
I
ue)

1
2
34
56
78
9l0
llt213141516

1
1
1
2
1
3
1
4
1
5
1
6
1
7
8
t718192021222324252627282930
3132
3334
3S
I
36
1
37
1
38
1
39
1
40
1
41
1
44445464748
49
50
5152
535455565758
59
60
6162
1
63
1
64
1
65
1
66
1
67
1
68
1
6
9
70
1
9
1
10
1
11
1
12
1
13
1
14
1
151671
1
72
1
73
1
74
1
75
1
76
1
77
1
78
1
79
1
80
1
81
1
82
1
83
1
84
85
86
87
88
1
89
1
9
0
1,
192
939495
96

BUR10-03B

a

1. Foreword
This chapter describes major inspection and service pro-
cedures for the engine mounted on the body. For proce-
dures not found in this chapter, refer to the service proce-
dure section in the applicable chapter.
2. Ignition Timing
A: MEASUREMENT
1. 2200 cc MODEL
1) Warm-up the engine.
G2M0094
2) To check the ignition timing, connect a timing light to #1
cylinder spark plug cord, and illuminate the timing mark
with the timing light.
3) Start the engine at idle speed and check the ignition
timing.
If the timing is not correct, check the ignition control sys-
tem.
Ignition timing [BTDC/rpm]:
14°±8°/700 (MT)
20°±8°/700 (AT)
2. 2500 cc MODEL
CAUTION:
After warming-up, engine becomes very hot. Be care-
ful not to burn yourself during measurement.
1) Warm-up the engine.
B2M0750A
2) To check the ignition timing, connect a timing light to #1
cylinder spark plug cord, and illuminate the timing mark
with the timing light.
3) Start the engine at idle speed and check the ignition
timing.
If the timing is not correct, check the ignition control sys-
tem.
Ignition timing [BTDC/rpm]:
15°±8°/700
2
2-2
1. Foreword - 2. Ignition Timing

1. Foreword
This chapter describes major inspection and service pro-
cedures for the engine mounted on the body. For proce-
dures not found in this chapter, refer to the service proce-
dure section in the applicable chapter.
2. Ignition Timing
A: MEASUREMENT
1. 2200 cc MODEL
1) Warm-up the engine.
G2M0094
2) To check the ignition timing, connect a timing light to #1
cylinder spark plug cord, and illuminate the timing mark
with the timing light.
3) Start the engine at idle speed and check the ignition
timing.
If the timing is not correct, check the ignition control sys-
tem.
Ignition timing [BTDC/rpm]:
14°±8°/700 (MT)
20°±8°/700 (AT)
2. 2500 cc MODEL
CAUTION:
After warming-up, engine becomes very hot. Be care-
ful not to burn yourself during measurement.
1) Warm-up the engine.
B2M0750A
2) To check the ignition timing, connect a timing light to #1
cylinder spark plug cord, and illuminate the timing mark
with the timing light.
3) Start the engine at idle speed and check the ignition
timing.
If the timing is not correct, check the ignition control sys-
tem.
Ignition timing [BTDC/rpm]:
15°±8°/700
2
2-2
1. Foreword - 2. Ignition Timing

3. Engine Idle Speed
A: MEASUREMENT
1) Before checking idle speed, check the following:
(1) Ensure that air cleaner element is free from
clogging, ignition timing is correct, spark plugs are in
good condition, and that hoses are connected properly.
(2) Ensure that malfunction indicator light (CHECK
ENGINE light) does not illuminate.
2) Warm-up the engine.
G2M0096
3) Connect Subaru Select Monitor or the OBD-II general
scan tool to data link connector.
CAUTION:
When connecting Subaru Select Monitor, turn ignition
switch to OFF.
4) Start the engine and measure engine speed.
NOTE:
Engine speed is indicated on Subaru Select Monitor by
selecting “MODE F04”.
G2M0097
NOTE:

When using the OBD-II general scan tool, carefully read
its operation manual.

When Subaru Select Monitor is not used, attach the
pickup sensor on tachometer (Secondary pickup type) to
#1 cylinder spark plug cord.

This ignition system provides simultaneous ignition for
#1 and #2 plugs. It must be noted that some tachometers
may register twice that of actual engine speed.
5) Check idle speed when unloaded. (With headlights,
heater fan, rear defroster, radiator fan, air conditioning, etc.
OFF)
Idle speed (No load and gears in neutral (MT) or N or
P (AT) position):
700±100 rpm
6) Check idle speed when loaded. (Turn air conditioning
switch to “ON” and operate compressor for at least one
minute before measurement.)
Idle speed [A/C“ON”, no load and gears in neutral
(MT) or N or P (AT) position]:
850±50 rpm
CAUTION:
Never rotate idle adjusting screw. If idle speed is out
of specifications, refer to General On-board Diagnosis
Table under “2-7 On-Board Diagnostics II System”.
3
2-2
3. Engine Idle Speed