4WD SUBARU LEGACY 1996 Service Repair Manual

ON-BOARD
DIAGNOSTICS
II
SYSTEM
[73c471
2-7

3
.
Diagnosis
System

47
.
READDATA
FUNCTION
KEY
LIST
FOR
AT

Function
mode
Contents
Abbr
.
Unit

F00
Mode
display
--

F01Battery
voltage
VB
V

F02
Vehicle
speed
sensor
1
VSP1
m/h

F03
Vehicle
speed
sensor
1
VSP1
km/h

F04
Vehicle
speed
sensor
2
VSP2
m/h

F05
Vehicle
speed
sensor
2
VSP2
km/h

F06
Engine
speed
EREV
rpm

F07
ATF
temperature
sensor
ATFT
deg
F

F08
ATF
temperature
sensor
ATFTdeg
C

F09
Throttleposition
sensor
THV
V

F10
Gear
position
GEAR
-

F11
Linepressureduty
PLDTY

F12
Lock-up
duty
LUDTY

F13
AWD
duty
4WDTY

F14
Throttleposition
sensor
power
supply
THVCC
V

F15
Mass
air
flow
sensor
~
AFM
~
V

33

2-7
[T3C48]
ON-BOARD
DIAGNOSTICS
II
SYSTEM
3
.
Diagnosis
System

E-4AT
(F00)

4WD
1993

G3M0723

Probable
cause
(if
outside"specifieddata")
48
.
FUNCTION
MODE
:
F00

-
MODE
DISPLAY
-

SPECIFIED
DATA
:

Data
at
the
left
shouldbe
indicated
.

1
.
Communication
failure
(1)
Check
loose
or
poor
connectors,
or
(No
communication
method
can
be
confirmed

with
power
ON
.)
(2)

shortcircuit
.

Check
type
of
cartridge
.

2
.
Vehicle
types
cannot
be
identified
(due
to

communication
failure)
.

VB
(F01)

12
.7
V

OBD0673

1
.
Battery

1
2
.
Charging
system

Check
improper
cartridge
.
Replace
with
proper
one
.

49
.
FUNCTION
MODE
:
F01

-
BATTERY
VOLTAGE
(VB)
-

CONDITION
:

(1)
Ignition
switch
ON

(2)
Engine
idling
after
warm-up

SPECIFIED
DATA
:

(1)
12±1
V

(2)
13
±
1
V

Check
battery
voltage
and
specific
gravity
of

electrolyte
.

(1)
I
Measure
regulatingvoltage
under
no
loads
.

(2)
Check
generator
(as
asingle
unit)
.

34

2-7
[T3C55]
ON-BOARD
DIAGNOSTICS
II
SYSTEM

3
.
Diagnosis
System

GEAR
.
(F10)

1
st

G3M0730

PLDTY
(Fl
1)

50%

G3M0731

LUDTY
(F12)

5%

G3M0732

4WDTY
(F13)

95%

G3M0733

THVCC
(F14)

5
.2
V

B3M0259

55
.
FUNCTION
MODE
:
F10

-
GEAR
POSITION
(GEAR)
-

56
.
FUNCTION
MODE
:
F11

-
LINE
PRESSURE
DUTY
(PLDTY)
-

57
.
FUNCTION
MODE
:
F12

-
LOCK-UP
DUTY
(LUDTY)
-

58
.
FUNCTION
MODE
:
F13

-
AWD
DUTY
(4WDTY)
-

59
.
FUNCTION
MODE
:
F14

-
THROTTLE
POSITION
SENSOR
POWER
SUPPLY

(THVCC)
-

36

AUTOMATIC
TRANSMISSION
AND
DIFFERENTIAL
[T6D1]
3-2

6
.
Diagnostic
Chart
for
On-board
Diagnostics
System

D
:
LIST
OF
TROUBLE
CODE

1
.
TROUBLE
CODE

Trouble
code
Item
Content
of
diagnosis
Abbr
.

(Select
monitor)
Page

11
Duty
solenoid
A
Detects
open
or
shorted
drive
pLDTY
-
circuit,
as
well
asvalve
seizure
.

12
Duty
solenoid
B
Detects
open
or
shorted
drive
LUDTY
-
circuit,
as
well
asvalve
seizure
.

13
Shift
solenoid
3
Detects
open
or
shorted
drive
OVR
-
circuit,
as
well
as
valve
seizure
.

14
Shift
solenoid
2
Detects
open
or
shorted
drive
SFT2
-
circuit,
as
well
as
valve
seizure
.

15
Shift
solenoid
1
Detects
open
or
shorted
drive
SFTi
-
circuit,
as
well
as
valve
seizure
.

21
ATF
temperature
sensor
Detects
open
or
shorted
input
ATFT
-
signal
circuit
.

22
Mass
air
flowsignalDetects
open
or
shorted
input
AFM
4
signal
circuit
.

23
Engine
speed
signal
Detects
open
or
shorted
input
EREV
6
signal
circuit
.

24
Duty
solenoid
C
Detects
open
or
shorted
drive
4WDTY
-
circuit,
as
well
as
valve
seizure
.

25
Torque
control
signal
Detects
open
or
shorted
input
TQ
.CT8
signal
circuit
.

31
Throttle
position
sensor
Detects
open
or
shorted
input
THV
10
signal
circuit
.

32
Vehicle
speed
sensor
1
Detects
open
or
shorted
input
VSP1
-
signal
circuit
.

33
Vehicle
speed
sensor
2Detects
open
or
shorted
input
VSP2
-
signal
circuit
.

3-2
[raB11]
AUTOMATIC
TRANSMISSION
AND
DIFFERENTIAL

8
.
Diagnostic
Chart
withSelect
Monitor

8
.
Diagnostic
Chart
with
Select
Monitor

B
:
LIST
OF
OUTPUT
MODES

1
.
FUNCTION
MODE

Mode
Contents
Abbr
.
Unit
Contents
of
display
Page

F00
Mode
display
--
AT
or
EGI
mode
(when
monitor
is
connected
.)
-

F01Battery
voltage
VBV
Battery
voltage
applied
to
control
unit
.
-

F02
Vehicle
speed
sensor
1
VSPi
m/h
Vehicle
speed
(miles/h)
sent
from
vehicle
speed
sensor
1
.
-

F03
Vehicle
speed
sensor
1
VSP1
km/h
Vehicle
speed
(km/h)sent
from
vehicle
speed
sensor
1
.
-

F04
Vehicle
speed
sensor
2
VSP2
m/h
Vehicle
speed
(miles/h)
sentfrom
vehicle
speed
sensor
2
.
-

F05
Vehicle
speed
sensor
2
VSP2
km/h
Vehicle
speed
(km/h)
sent
from
vehicle
speed
sensor
2
.
-

F06
Engine
speed
EREV
rpm
Engine
speed
sent
from
ECM
.
-

F07
ATF
temperature
sensor
ATFT
°F
ATF
temperature
(°F)
sent
from
ATF
temperature
sensor
.
-

F08
ATF
temperature
sensor
ATFT
°C
ATF
temperature
(°C)
sent
from
ATF
temperature
sensor
.
-

F09
Throttleposition
sensor
THV
V
Voltage
sent
from
throttle
position
sensor
.
15

F10
Gear
position
GEAR
-
Transmissiongear
position
-

F11Line
pressure
duty
PLDTY
%
Duty
ratio
flowing
through
duty
solenoid
A
.
16

F12
Lock-up
duty
LUDTY
%
Duty
ratio
flowing
through
duty
solenoid
B
.
17

F13
AWD
duty
4WDTY
%
Duty
ratio
flowing
through
duty
solenoid
C
.
18

F14
Throttle
position
sensor
power
supply
THVCC
VPower
supply
voltage
to
throttle
position
sensor
19

F15
Mass
air
flowsignal
l
AFM
V
Output
voltage
from
air
flow
sensor
19

14

3-2
[Two]
AUTOMATIC
TRANSMISSION
AND
DIFFERENTIAL

8
.
Diagnostic
Chart
withSelect
Monitor

4WDTY
(F13)

95%

G3M0733

Probable
cause
(if
outside
"specified
data")

1
.
Throttle
position
sensor

1
2
.
Vehicle
speed
sensor
1

1
3
.
Vehicle
speed
sensor
2

1
4
.
ATF
temperature
sensor

5
.
Inhibitor
switch

M
:
MODE
F13
-
AWD
DUTY
(4WDTY)
-

CONDITION
:

"
After
sufficient
warm-up

"
Ignition
switch
ON
(engine
OFF)

FWD
mode

"
AWD
mode,
D
range,
full
throttle

SPECIFIED
DATA
:

*
95%
(FWD
mode)

*
25%,
max
.
(vehicle
speed
0
m/h)
(AWD
mode)

Check
in
F09
mode
.
<
Ref
.
to
3-2
[T810]
.*2>

OK

Check
in
F02
mode
.
<
Ref
.
to
3-2
[TSEO].*1
>
OK

Check
in
F04
mode
.
<
Ref
.
to
3-2
(T8F0]
.*1
>

OK

Check
in
F07
mode
.
<
Ref
.
to
3-2
[T8H0]
.*i
>

OK

Check
for
operation
.

OK

1
6
.
ABS
signal
Check
ABS
system
for
operation
.

OK

I
Check
TCM
and
replace
if
necessary
.

18

G4M0538
7) Models equipped with rear disc brakes:
Remove union bolt from brake caliper.
8) Models equipped with rear drum brakes:
Disconnect brake hose from brake pipe from strut, and
disconnect brake pipe from dram brake.
G4M0539
9) Remove bolts which secure rear strut to housing.
10) Remove nuts securing strut mount to body.
11) Remove strut mount cap.
B: DISASSEMBLY
For disassembly of rear strut, refer to procedures outlined
under front strut as a guide.

C: INSPECTION
Refer to Front Strut 4-1 [W4C0] as a guide for inspection
procedures.
G4M0540
D: ASSEMBLY
Refer to Front Strut 4-1 [W4D0] as a guide for assembly
procedures.
CAUTION:

Install rear strut with “FWD” or “4WD” mark on strut
mount facing outside of vehicle body.

Insert the protrusion of lower rubber seat into the
strut spring seat hole.
41
4-1SERVICE PROCEDURE
9. Rear Strut

51. READ DATA FUNCTION KEY LIST FOR AT
Function mode Contents Abbr. Unit
F00 Mode display——
F01 Battery voltage VB V
F02 Vehicle speed sensor 1 VSP1 m/h
F03 Vehicle speed sensor 1 VSP1 km/h
F04 Vehicle speed sensor 2 VSP2 m/h
F05 Vehicle speed sensor 2 VSP2 km/h
F06 Engine speed EREV rpm
F07 ATF temperature sensor ATFT deg F
F08 ATF temperature sensor ATFT deg C
F09 Throttle position sensor THV V
F10 Gear position GEAR—
F11 Line pressure duty PLDTY %
F12 Lock-up duty LUDTY %
F13 AWD duty 4WDTY %
F14 Throttle position sensor power supply THVCC V
F15 Mass air flow sensor AFM V
52
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

G3M0730
59. FUNCTION MODE: F10
—GEAR POSITION (GEAR)—
G3M0731
60. FUNCTION MODE: F11
—LINE PRESSURE DUTY (PLDTY)—
G3M0732
61. FUNCTION MODE: F12
—LOCK-UP DUTY (LUDTY)—
G3M0733
62. FUNCTION MODE: F13
—AWD DUTY (4WDTY)—
B3M0259
63. FUNCTION MODE: F14
—THROTTLE POSITION SENSOR POWER SUPPLY
(THVCC)—
55
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

D: LIST OF TROUBLE CODE
1. TROUBLE CODE
Trouble code Item Content of diagnosisAbbr.
(Select monitor)Page
11 Duty solenoid ADetects open or shorted drive
circuit, as well as valve seizure.PLDTY 15
12 Duty solenoid BDetects open or shorted drive
circuit, as well as valve seizure.LUDTY 19
13 Shift solenoid 3Detects open or shorted drive
circuit, as well as valve seizure.OVR 23
14 Shift solenoid 2Detects open or shorted drive
circuit, as well as valve seizure.SFT2 25
15 Shift solenoid 1Detects open or shorted drive
circuit, as well as valve seizure.SFT1 27
21 ATF temperature sensorDetects open or shorted input
signal circuit.ATFT 29
22 Mass air flow signalDetects open or shorted input
signal circuit.AFM 32
23 Engine speed signalDetects open or shorted input
signal circuit.EREV 34
24 Duty solenoid CDetects open or shorted drive
circuit, as well as valve seizure.4WDTY 36
25 Torque control signalDetects open or shorted input
signal circuit.TQ.CT 38
31 Throttle position sensorDetects open or shorted input
signal circuit.THV 40
32 Vehicle speed sensor 1Detects open or shorted input
signal circuit.VSP1 43
33 Vehicle speed sensor 2Detects open or shorted input
signal circuit.VSP2 47
13
3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
6. Diagnostic Chart for On-board Diagnostic System