Subaru Legacy IV (2008 year). 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

Outer rotor

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

Number of front sun gear teeth

Number of mid internal gear teeth

Number of mid carrier teeth

Number of mid sun gear teeth

Number of rear internal gear teeth

110

Number of rear carrier teeth

Number of rear sun gear teeth

Number of front brake drive plates

Number of input clutch drive plates

Number of high & low reverse clutch
drive plates

Number of direct clutch drive plates

Number of reverse brake drive plates

Number of forward brake drive plates

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

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

85W

80W

75W -90

25 30

-5 0

-22 -15

23 32

MT-00001

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