Subaru Legacy IV (2008 year). Service manual — part 719
4AT(diag)-97
General Diagnostic Table
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Shock occurs when shifting from 2nd to 3rd gear.
• TCM
• Torque converter turbine speed sensor
• Accelerator pedal position sensor
• 2-4 brake duty solenoid
• ATF temperature sensor
• Line pressure linear solenoid
• Low & reverse duty solenoid
• Control valve
• High clutch
• 2-4 brake
• ATF deterioration
• Engine performance
• High clutch duty solenoid
Slippage occurs when shifting from 2nd to 3rd gear.
• TCM
• Accelerator pedal position sensor
• 2-4 brake duty solenoid
• ATF temperature sensor
• Line pressure linear solenoid
• Control valve
• High clutch
• 2-4 brake
• Low & reverse duty solenoid
Shock occurs when shifting from 3rd to 4th gear.
• TCM
• Torque converter turbine speed sensor
• Accelerator pedal position sensor
• 2-4 brake duty solenoid
• ATF temperature sensor
• Line pressure linear solenoid
• Control valve
• Low clutch duty solenoid
• 2-4 brake
• ATF deterioration
• Engine performance
Slippage occurs when shifting from 3rd to 4th gear.
• TCM
• Accelerator pedal position sensor
• 2-4 brake duty solenoid
• ATF temperature sensor
• Line pressure linear solenoid
• Control valve
• 2-4 brake
Shock occurs when shifting from 3rd to 2nd gear.
• TCM
• Torque converter turbine speed sensor
• Accelerator pedal position sensor
• ATF temperature sensor
• Line pressure linear solenoid
• Control valve
• 2-4 brake duty solenoid
• 2-4 brake
• ATF deterioration
• High clutch duty solenoid
Shock occurs when shifting from 2nd to 1st gear.
• TCM
• Torque converter turbine speed sensor
• Accelerator pedal position sensor
• ATF temperature sensor
• Line pressure linear solenoid
• Control valve
• Low & reverse clutch
• ATF deterioration
• 2-4 brake duty solenoid
• Low & reverse brake duty solenoid
Symptom
Problem parts
4AT(diag)-98
General Diagnostic Table
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Shock occurs when accelerator pedal is released from medium
speed.
• TCM
• Accelerator pedal position sensor
• ATF temperature sensor
• Line pressure linear solenoid
• Control valve
• Lock-up damper
• Engine performance
Vibration occurs during straight-forward operation.
• TCM
• Lock-up duty solenoid
• Lock-up facing
• Lock-up damper
Vibration occurs during turns. (Tight corner braking phenome-
non)
• TCM
• Front vehicle speed sensor
• Rear vehicle speed sensor
• Accelerator pedal position sensor
• ATF temperature sensor
• Transfer clutch
• Transfer valve
• Transfer duty solenoid
• ATF deterioration
• Harness
Front wheel slippage occurs during standing starts.
• TCM
• Front vehicle speed sensor
• Accelerator pedal position sensor
• ATF temperature sensor
• Control valve
• Transfer clutch
• Transfer valve
• Transfer pipe
• Transfer duty solenoid
It is not set in FWD mode.
• TCM
• Transfer clutch
• Transfer valve
• Transfer duty solenoid
• Fuse
Select lever is hard to move.
• Select cable
• AT select lever
• Detent spring
• Manual plate
Select lever is excessively hard to move. (Unreasonable resis-
tance)
• Detent spring
• Manual plate
Select lever slips out of selected shift position during accelera-
tion or while driving on rough terrain.
• Select cable
• AT select lever
• Detent spring
• Manual plate
Manual mode can not be set.
• SPORT/manual mode switch
• TCM
• Body integrated unit
Gear does not change though the select lever is operated in
manual mode.
• Up shift switch
• Down shift switch
• TCM
• Body integrated unit
AWD warning light remains blinking or illuminated.
• Tire size
• Tire pressure
• TCM
• FWD fuse holder
• Harness
Symptom
Problem parts
5AT-2
General Description
AUTOMATIC TRANSMISSION
1. General Description
A: SPECIFICATION
1. TORQUE CONVERTER CLUTCH
2. OIL PUMP
3. TRANSMISSION CONTROL ELEMENT
4. TRANSMISSION GEAR RATIO
5. PLANETARY GEAR AND PLATE
6. SELECTOR POSITION
Model
Turbo
Non-turbo
Type
Symmetric, 3 element, single stage,
2 phase torque converter
Stall torque ratio
2.0
1.9
Nominal diameter
246 mm (9.69 in)
Stall speed (at sea
level)
2,300 — 3,200
rpm
1,900 — 2,200
rpm
One-way clutch
Sprag type one-way clutch
Type
Internal gear fixed displacement
pump
Driving method
Driven by engine
Number of teeth
Inner rotor
9
Outer rotor
10
Type
5-forward, 1-reverse,
double-row planetary gears
Multi-plate clutch
3 sets
Multi-plate brake
3 sets
One-way clutch
(sprague type)
2 sets
1st
3.540
2nd
2.264
3rd
1.471
4th
1.000
5th
0.834
Rev.
2.370
Model
Turbo
Non-
turbo
Number of front internal gear teeth
106
Number of front carrier teeth
28
Number of front sun gear teeth
50
Number of mid internal gear teeth
78
Number of mid carrier teeth
18
Number of mid sun gear teeth
42
Number of rear internal gear teeth
110
Number of rear carrier teeth
24
Number of rear sun gear teeth
62
Number of front brake drive plates
2
Number of input clutch drive plates
6
5
Number of high & low reverse clutch
drive plates
4
Number of direct clutch drive plates
5
Number of reverse brake drive plates
5
Number of forward brake drive plates
5
4
P (Park)
Transmission is in neutral, output mem-
ber is immovable, engine start is possi-
ble
R (Reverse)
Transmission is in reverse.
N (Neutral)
Transmission is in neutral and engine
start is possible
D (Drive)
Automatic gear change
1st
m o 2nd m o 3rd m o 4th m o 5th
Manual mode (+)
Manual gear change
1st
o 2ndo 3rdo 4tho 5th
Manual mode (–)
Manual gear change
1st
m 2nd m 3rd m 4th m 5th
Control method
Wire cable type
5AT-3
General Description
AUTOMATIC TRANSMISSION
7. HYDRAULIC CONTROL AND
LUBRICATION
8. COOLING AND HARNESS
9. TRANSFER
10.FINAL REDUCTION GEAR
11.RECOMMENDED GEAR OIL
Type
Electronic/hydraulic control
[5 forward gear changes
made by electronic signals of
vehicle speed and accelera-
tor (throttle) opening]
Fluid
Recommended
materials
SUBARU ATF HP
Alternative
Idemitsu “ATF HP”
CAUTION:
Be sure to use the recom-
mended or equivalent ATF.
Using material except rec-
ommended one or substi-
tute would cause trouble.
Fluid
capacity
2 (US qt, Imp qt)
9.6 — 10.0
(10.1 — 10.6, 8.4 — 8.8)
Lubrication system
Forced feed lubrication with
oil pump
Cooling system
Liquid-cooler incorporated in radia-
tor
Transmission harness
20 + 8 poles
Transfer type
Variable torque distribution (VTD)
Number of transfer
clutch drives and driven
plates
3
Reduction gear ratio
1.000 (41/41)
Model
3.0 R LTD
OBK 2.5 XT
LTD
OBK 3.0 R
2.5 GT
2.5 GT LTD
3.0 R
Front final reduction
gear ratio
3.272
3.083
Lubrication oil
(1) Item
(3) API standard
(2) Front differential gear oil
(4) SAE viscosity No. and
applicable temperature
Front differential oil capacity
2 (US qt, Imp qt)
1.3 — 1.5 (1.4 — 1.6, 1.1 — 1.3)
(1)
(4)
GL-5
(3)
(2)
( C)
( F)
-30 -26 -15
15
90
85W
80W
75W -90
25 30
-5 0
-22 -15
23 32
86
59
77
5
MT-00001
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