heater SUBARU LEGACY 1996 Service Repair Manual

2-7
[T3C6]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

3
.
Diagnosis
System

6
.
READDATA
FUNCTION
KEY
LIST
FOR
ENGINE

Function
mode
Contents
Abbreviation
Unit
of
measure

F00
ROM
ID
number
YEAR
-

F01Battery
voltage
VB
V

F02
Vehicle
speed
signal
VSP
km/h,
MPH

F03Engine
speed
signal
EREV
rpm

F04Engine
coolant
temperature
signal
TW
°C,
°F

F05
Ignition
signal
ADVS
deg

F06
Mass
air
flow
signal
QA
g/s,
V

F07
Throttle
position
signal
THV
%,
V

FOS
Injector
pulse
width
TIM
ms

F09
Idle
air
control
signal
ISC
°/m

F10
Load
data
LOAD

F11
Front
oxygen
sensor
outputsignal
02
V

F12
Front
oxygen
sensor
maximum
and
minimum
output

signal
02max
-
min
V,
V

F13
Rear
oxygen
sensor
output
signal
R02
V

F14
Rear
oxygen
sensor
maximum
and
minimum
output

signal
R02max
-
min
V,
V

F17
Short
term
fuel
trim
ALPHA

F19
Knock
sensor
signal
KNOCK
deg

F20
Atmospheric
absolute
pressure
signal
BARD
.
P
kPa,
mmHg

F21
Intake
manifold
absolute
pressure
signal
MANi
.
P
kPa,
mmHg

F29
A/F
correction
(short
term
trim)
by
rear
oxygen
sensor
PHOS

F30
Longterm
fuel
trim
KBLRC

F31
Longterm
whole
fuel
trim
KO

F32
Front
oxygen
sensor
heater
current
F02H
A

F33
Rear
oxygen
sensor
heater
current
R02H
A

F36
Maximum
value
of
cylinder#1
misfire
times
during
100

rotations
MFi

F37
Maximum
value
of
cylinder
#2
misfire
times
during
100

rotations
MF2

F38
Maximum
value
of
cylinder
#3
misfire
times
during
100

rotations
MF3

F39
Maximum
value
of
cylinder
#4
misfire
times
during
100

rotations
MF4

F42
Maximum
and
minimum
EGR
system
pressure
value
EGRmax
-
minkPa

FAO
ON
H
OFF
signal
-
-

FA1
ON
~-->
OFF
signal
-
-

FA2
ON
H
OFF
signal
-
-

FA3
ON
H
OFF
signal
-
-

FA4
ON
H
OFF
signal
-
-

FA5
ON
H
OFF
signal
-
-

FBO
Diagnostic
trouble
code
(DTC)
INSPECT
-

18

ON-BOARS
DIAGNOSTICS
II
SYSTEM
[T3C33]
2-7

3
.
Diagnosis
System

F02H
I

1
.
00
A

B2M0497

R02H
(
F33
)
1
.
00
A

B2M0498
MF1
(F36
)

B2M0499

MF2
(
F37
)

0

B2M0500

MF3
(F38)

0

82M0501

29
.
FUNCTION
MODE
:
F32

-
FRONT
OXYGEN
SENSOR
HEATER
CURRENT

(F02H)
-

30
.
FUNCTION
MODE
:
F33

-
REAR
OXYGENSENSOR
HEATER
CURRENT

(R02H)
-

31
.
FUNCTION
MODE
:
F36

-
MAXIMUM
VALUE
OF
CYLINDER
#1
MISFIRE
RATE

DURING
100
ROTATIONS
(MF1)
-

32
.
FUNCTION
MODE
:
F37

-
MAXIMUM
VALUE
OF
CYLINDER
##2
MISFIRE
RATE

DURING
100
ROTATIONS
(MF2)
-

33
.
FUNCTION
MODE
:
F38

-
MAXIMUM
VALUE
OF
CYLINDER
#3
MISFIRE
RATE

DURING
100
ROTATIONS
(MF3)
-

25

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[TSO1]
2-7
5
.
Specified
Data

C
t
T
il
Signal
(V)

Content
onnec
or
erm
na
Ignition
SW
ON
Note
No
.
No
.
Engine
ON
(Idling)
(Engine
OFF)

Starter
switch
B84
8600
Cranking
:
8
to
14

A/C
switch
B84
60
ON
:
10
-
13
ON
:
13
-
14

OFF
:
0
OFF
:
0

Ignition
switch
B84
85
10-13
13-
14
-

Neutral
position
switch
B84
82
ON
:
0
Switch
is
ON
when
shift
isin
"
"
OFF
:
5
.0f0
.5
"N
or
"P
position
.

Test
mode
connector
884
84
55
When
connected
:
0

Knock
Signal
B84
32
.8
2
.8
-

sensor
Shield
B84
56
00
-

AT/MT
identification
B84
81
55
When
measuring
voltage

between
ECM
and
body
.

Back-up
power
supply
B84
39
10-1313-14
Ignition
switch
"OFF"
:
10
-
13
Control
unit
power
1
supply
B84

2
10-13
13-14
-

Ignition
#
1,
#
2
B84
41
0
1
-3
.4
-

control
#
3,
#
4
B84
400
1
-3
.4
-

#
1
B84
96
10-13
1-14
Waveform

Fuel
#
2
B84
70
10-13
1-14
Waveform

injector
#
3
B84
44
10-13
1-14
Waveform

#
4
B84
16
10-13
1
-14
Waveform

Idle
air
OPEN
endB84
14
-
1
-13
Waveform
control

solenoid
CLOSE
B84
13
-
13-1
Waveform
valve
end

Fuel
pump
relay
g84
32
ON
:
0
.5,
or
less0
.5,
or
less
-
control
OFF
:
10
-
13

A/C
relay
control
B84
31
ON
:
0
.5,
orless
ON
:
0
.5,
or
less
OFF
:
10
-
13
OFF
:
13
-
14

Radiator
fan
relay
1
ON
:
0
.5,
or
less
ON
:
0
.5,
or
less

control

B84
74
OFF
:
10
-
13
OFF
:
13
-
14

Radiator
fan
relay2

B84
73

ON
:
0
.5,
or
less
ON
:
0
.5,
or
less
With
A/C
vehicles
only
control
OFF
:
10
-
13
OFF
:
13
-
14

Self-shutoff
control
B84
63
10-13
13-14
-

Malfunction
indicator
B84
58Light
"ON"
:
1,
or
less

lamp
Light
"OFF"
:
10
-
14

Engine
speed
output
B84
64
-
0
-
13,
or
moreWaveform

Torque
control
signal
B84
79
5
5
-

Mass
air
flow
signal
B84
47
0-0
.3
0
.8-
1
.2
-

Purge
control
solenoid

B84
72

ON
:
1,
or
less
ON
:
1,
or
less

valve
OFF
:
10
-
13
OFF
:
13
-
14

Atmospheric
pressure
B84
263
.9-4
.1
2
.0-2
.3
-
sensor

Pressure
sources
ON
:
1,
or
less
ON
:
1,
or
less
switching
solenoid
B84
15
OFF
:
10
-
13
OFF
:
13
-
14valve

EGR
solenoid
valve
B84
71
ON
:
1,
or
less
ON
:
1,
or
less

OFF
:
10
-
13
OFF
:
13
-
14
Front
oxygen
sensor
g84
38
0-1
.0
0-1
.0
-
heater
signal

45

2-7
tT5o21
ON-BOARD
DIAGNOSTICS
II
SYSTEM
5
.
Specified
Data

CT
il
Signal
(V)

Content
onnector
erm
na
I9nition
SW
ON
Note
No
.
No
.
(Engine
OFF)Engine
ON
(Idling)

Rear
oxygen
sensor
B84
37
0-1
.0
0-1
.0
-
heater
signal

AT
diagnosis
input
B84
80
Less
than
1
.-
.
More
Less
than
1
+-+
MoreWaveform
signal
than4
than
4

GND
(sensors)
B84
200
0
-

i
B
469
GND
(
njectors)
80
0
-
95

GND
(ignition
system)
B84
940
0
-

ND
l
B
4
19
(powersupp
y)
G
800
-
46
17
GND
(control
systems)
B84
00
-
18

GND
(oxygen
sensor
B84
4200
heater)

2
.
ENGINECONDITION
DATA

Content
Specified
data

i
fl
M
1.7
-
3
.3
(g/sec)
:
Idling
r
ass
a
ow
7
.1
-
14
.2
(g/sec)
:
2,500
rpm
racing

E
il
d
1.6
-
2
.9
(%)
:
Idling
ng
neoa
6
.4
-
12
.8
(%)
:
2,500
rpm
racing

Measuring
condition
:

"
After
warm-up
theengine
.

"
Gear
position
is
in
"N"
or
"P"
position
.

"
A/C
is
turned
OFF
.

All
accessory
switches
are
turned
OFF
.

46

2-T
[T11A0]
ON-BOARD
DIAGNOSTICS
11
SYSTEM

11
.
Diagnostics
Chart
with
Trouble
Code

11
.
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
76

P0101
QA
-
RMass
air
flow
sensor
circuit
range/performance
problem
77

P0105
P
-
S
Pressure
sensor
circuit
malfunction
78

P0106
PS
-
R
Pressure
sensor
circuit
range/performance
problem
79

P0115
TW
Engine
coolant
temperature
sensor
circuit
malfunction
80

P0120
THV
Throttleposition
sensor
circuit
malfunction
81

P0121
TH
-
R
Throttleposition
sensor
circuit
range/performance
problem
82

P0125
TW
-
CL
Insufficient
coolant
temperature
for
closed
loop
fuel
control
83

P0130
F02
-
V
Front
oxygen
sensor
circuit
malfunction
84

P0133
F02
-
R
Front
oxygen
sensor
circuit
slowresponse
85

P0135
F02H
Front
oxygen
sensor
heater
circuit
malfunction
86

P0136
R02
-
V
Rear
oxygen
sensor
circuit
malfunction
87

P0139
R02
-
R
Rear
oxygen
sensor
circuit
slowresponse88

P0141
R02H
Rear
oxygen
sensor
heater
circuit
malfunction
89

P0170
FUEL
Fuel
trim
malfunction
90

P0201
INJ1Fuel
injector
circuit
malfunction
-
#1

P0202
INJ2Fuel
injector
circuit
malfunction
-
#2
91
P0203
INJ3Fuel
injector
circuit
malfunction
-
#3

P0204
INJ4Fuel
injector
circuit
malfunction
-
#4

P0301
MIS
-
1
Cylinder
1
misfire
detected

P0302
MIS
-
2
Cylinder
2
misfire
detected
2
P0303
MIS
-
3
Cylinder
3
misfire
detected
9

P0304
MIS
-
4
Cylinder
4
misfire
detected

P0325
KNOCK
Knock
sensor
circuit
malfunction
93

P0335
CRANK
Crankshaft
position
sensor
circuit
malfunction
94

P0340
CAM
Camshaft
position
sensor
circuit
malfunction
95

P0400
EGR
Exhaust
gas
recirculation
flow
malfunction
96

P0403
EGRSOL
Exhaust
gas
recirculation
circuit
malfunction
97

P0420
CAT
Catalyst
system
efficiency
below
threshold
98

P0441
CPC
-
F
Evaporative
emission
control
system
incorrect
purge
flow
99

P0443
CPC
Evaporative
emission
control
system
purge
control
valve
circuit
malfunction
100

P0500
VSP
Vehicle
speed
sensor
malfunction
101

P0505
ISC
Idle
control
system
malfunction
102

P0506
ISC
-
L
Idle
control
system
RPM
lower
than
expected
103

P0507
ISC
-
H
Idle
control
system
RPM
higher
than
expected
104

P0600
-
Serial
communication
link
malfunction
105

P0601
RAM
Internal
control
module
memory
check
sum
error
106

P0703
ATBRK
Brake
switch
input
malfunction
T
107
I

74

2-7
[T11L0]
ON-BOARD
DIAGNOSTICS
II
SYSTEM
11
.
DiagnosticsChart
with
Trouble
Code

L
:
DTC
P0135

-
FRONT
OXYGEN
SENSOR
HEATER
CIRCUIT

MALFUNCTION
(F02H)
-

WIRING
DIAGRAM
:

Main
relay
0

0

-i
~
r

847

SBF-2

O
818
Front
oxygensensor
E
8

-
--------
-
--
--
--
--
--
-
--

ECM

OOE

O
e+~
s,a

u
U
15161
u
17181
uu
19
1101
u
I
u
131pu
44
X
234

M56

1
1819
21
342
2
23
g
8

7
L57
jjj%1
667
D
1213
1
/417517517
7
1181901610210631
1
6616
1011,
1
234

B2M0788

NOTE
:

Forthe
diagnostic
procedure
on
front
oxygen
sensor

heater
circuit
malfunction
(DTC
P0135),
refer
to
2-7

[T10L0)*2
.

86

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[Ti1ooi
2-7

11
.
Diagnostics
Chart
with
Trouble
Code

O
:
DTC
P0141

-
REAR
OXYGENSENSOR
HEATER
CIRCUIT

MALFUNCTION
(R02H)
-

WIRING
DIAGRAM
:

Main
rel
0
<-O
O
o

B47

SBF-2

Rear
oxygen
sensor
819
O
T6
Cal
model)

1-1
--

1991

ECM

Rearoxygensensor
(Cal
.model
only)

O
O
B47819

1
34
T6

9012
3
4
1234
5
6
43

B2M079U
I

NOTE
:

For
the
diagnostic
procedure
on
rear
oxygen
sensor

heater
circuit
malfunction
(DTC
P0141),
referto
2-7

[T1000]*2
.

89

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>

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

1. Engine Coolant Pump
G2M0201

1Engine coolant pump ASSY


2Gasket


3Heater hose


4Thermostat


5Gasket


6Thermostat case
Tightening torque: N⋅m (kg-m, ft-lb)
T1: First 10+4
0(1.0+0.4
0, 7.2+2.9
0)
Second 10+4
0(1.0+0.4
0, 7.2+2.9
0)
T2: 6.4±0.5 (0.65±0.05, 4.7±0.4)
4
2-5COMPONENT PARTS
1. Engine Coolant Pump