Subaru Legacy (2005 year). Manual - part 505

AUTOMATIC TRANSMISSION

4AT

Page

1.

General Description ....................................................................................2

2.

Automatic Transmission Fluid ...................................................................31

3.

Differential Gear Oil...................................................................................33

4.

Road Test..................................................................................................34

5.

Stall Test ...................................................................................................35

6.

Time Lag Test ...........................................................................................36

7.

Line Pressure Test ....................................................................................37

8.

Transfer Clutch Pressure Test ..................................................................38

9.

Automatic Transmission Assembly ...........................................................39

10.

Transmission Mounting System ................................................................47

11.

Extension Case Oil Seal ...........................................................................49

12.

Differential Side Retainer Oil Seal.............................................................50

13.

Inhibitor Switch..........................................................................................51

14.

Front Vehicle Speed Sensor .....................................................................55

15.

Rear Vehicle Speed Sensor......................................................................58

16.

Torque Converter Turbine Speed Sensor .................................................59

17.

Control Valve Strainer ...............................................................................60

18.

Control Valve Body ...................................................................................62

19.

Air Bleeding of Control Valve ....................................................................64

20.

ATF Filter ..................................................................................................65

21.

Transmission Control Module (TCM) ........................................................66

22.

Lateral G Sensor .......................................................................................67

23.

ATF Cooler Pipe and Hose .......................................................................68

24.

ATF Cooler (with Warmer Function) .........................................................73

25.

Warmer Cock ............................................................................................77

26.

Air Breather Hose......................................................................................79

27.

Oil Charge Pipe.........................................................................................80

28.

Torque Converter Clutch Assembly ..........................................................81

29.

Extension Case .........................................................................................83

30.

Transfer Clutch..........................................................................................87

31.

Multi-plate Clutch ......................................................................................93

32.

Rear Drive Shaft........................................................................................94

33.

Reduction Driven Gear..............................................................................95

34.

Reduction Drive Gear................................................................................97

35.

Center Differential Carrier .........................................................................99

36.

Parking Pawl ...........................................................................................101

37.

Converter Case .......................................................................................102

38.

Oil Pump Housing ...................................................................................104

39.

Drive Pinion Shaft Assembly...................................................................109

40.

Front Differential Assembly .....................................................................115

41.

AT Main Case .........................................................................................121

42.

Transmission Control Device ..................................................................142

4AT-2

AUTOMATIC TRANSMISSION

General Description

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

2.0 L

2.5 L

Type

Symmetric, 3 element, single stage,

2 phase torque converter

Stall torque ratio

2.0 — 2.2

1.8 — 2.15

Nomi-
nal 
diame-
ter

mm (in)

236 (9.29)

246 (9.69)

Stall speed (at sea 
level)

2,000 — 2,500 

rpm

2,300 — 2,800 

rpm

One-way clutch

Sprague type one-way clutch

Type

Parachoid constant-discharge pump

Driving method

Driven by engine

Number of teeth

Inner rotor

9

Outer rotor

10

Type

4-forward, 1-reverse,

double-row planetary gears

Multi-plate clutch

3 sets

Multi-plate brake

2 sets

One-way clutch 
(sprague type)

1 sets

1st

2.785

2nd

1.545

3rd

1.000

4th

0.694

Rev

2.272

Model

2.0 L

2.5 L

Front sun gear 
number of teeth

33

Front pinion num-
ber of teeth

21

Front internal gear 
number of teeth

75

Rear sun gear 
number of teeth

42

Rear pinion num-
ber of teeth

17

Rear internal gear 
number of teeth

75

Drive plate num-
ber of high clutch

4

Drive plate num-
ber of low clutch

4

5

Drive plate num-
ber of reverse 
clutch

2

Drive plate num-
ber of 2-4 brake

2

3

Drive plate num-
ber of low & 
reverse brake

4

5

P (Park)

Transmission in neutral, output mem-
ber immovable, and engine start possi-
ble

R (Reverse)

Transmission in reverse for backing

N (Neutral)

Transmission in neutral and engine 

start possible

D (Drive)

4-forward automatic gear change

1st 

←

→

 2nd 

←

→

 3rd 

←

→

 4th

SPORT mode

4-forward automatic gear change

1st 

←

→

 2nd 

←

→

 3rd 

←

→

 4th

Manual mode (+)

4-forward manual gear change

(shift up)

1st 

→ 2nd → 3rd → 4th

Manual mode (

−)

4-forward manual gear change

(shift down)

1st 

← 2nd ← 3rd ← 4th

Control method

Wire cable type

4AT-3

AUTOMATIC TRANSMISSION

General Description

7. HYDRAULIC CONTROL AND LUBRICA-
TION

8. COOLING AND HARNESS

9. TRANSFER

10.FINAL REDUCTION

11.RECOMMENDED GEAR OIL

Type

Electronic hydraulic control 
[Four forward speed 
changes by electrical signals 
of vehicle speed and accel-
erator (throttle) opening]

Fluid

SUBARU ATF or IDEMITSU 
“Apolloil ATF HP”, Castrol 
“Transmax J”
NOTE:
If the ATF above are not
available, use Dexron III.

Fluid 
capacity

2 (US

qt, Imp

qt)

2.0 L

8.4 — 8.7

(8.9 — 9.2, 7.4 — 7.7)

2.5 L

9.3 — 9.6

(9.8 — 10.1, 8.2 — 8.4)

Lubrication system

Forced feed lubrication with 
oil pump

Oil

Automatic transmission fluid 
(above mentioned)

Cooling system

Liquid-cooled cooler

Inhibitor switch

12 poles

Transmission harness

20 poles

Model

2.0 L

2.5 L 

except for 

VTD model

2.5 L VTD 

model

Transfer type

Multi-plate transfer

(MP-T)

Variable 

torque dis-

tribution 

(VTD)

Drive & driven 
plate number of 
transfer clutch

4

5

3

Control method

Electronic hydraulic type

Lubricant

The same Automatic transmission fluid 
used in automatic transmission

Reduction gear 
ratio

1.000 (53/53)

Model

Except for OUTBACK

OUTBACK

Front final reduction gear ratio

4.111 (37/9)

4.444 (40/9)

Lubrication oil

(1) Item

(3) API standard

(2) Front differential gear oil

(4) SAE viscosity No. and applica-

ble temperature

Front differential oil 
capacity

2 (US qt,

Imp qt)

1.1 — 1.3 (1.2 — 1.4, 1.0 — 1.1)

MT-00001

(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

4AT-4

AUTOMATIC TRANSMISSION

General Description

B: COMPONENT

1. TORQUE CONVERTER CLUTCH AND CASE

(1)

Pitching stopper bracket

(11)

Torque converter clutch ASSY

Tightening torque: N

⋅

m (kgf-m, ft-lb)

(2)

O-ring

(12)

Drain plug

T1: 18 (1.8, 13.3)

(3)

Differential oil level gauge

(13)

Gasket

T2: 23 (2.3, 17)

(4)

Stay

(14)

Oil seal

T3: 33 (3.4, 24.3)

(5)

Seal pipe

(15)

Converter case

T4: 41 (4.2, 30.4)

(6)

Oil pump shaft

(16)

Harness stay

T5: 44 (4.5, 32.5) (Aluminum gasket)

70 (7.1, 51.6) (Copper gasket)

(7)

Clip

(17)

ATF cooler ASSY with warmer 
function (if equipped)

(8)

Oil drain pipe

(9)

Input shaft

(18)

Bracket (if equipped)

(10)

O-ring

(19)

Clip (if equipped)

AT-02159

T4

T4

T4

T4

T5

T1

(8)

(11)

(1)

(2)

(16)

(18)

(17)

(19)

(3)

(4)

(7)

(5)

(6)

(10)

(9)

(14)

(15)

(12)

(13)

T3

T2