AUTOMATIC TRANSMISSION(4AT) > General Description

SPECIFICATION

1. TORQUE CONVERTER CLUTCH

Model

1.5 L DOHC

2.0 L DOHC

Type

Symmetric, 3 element, single stage,

2 phase torque converter

Stall torque ratio

2.2 — 2.4

2.0 — 2.2

Nominal diameter

236 mm (9.29 in)

Stall speed (at sea level)

2,300 — 2,800 rpm

2,100 — 2,600 rpm

One-way clutch

Sprague type one-way clutch

2. OIL PUMP

Type

Parachoid constant-displacement pump

Driving method

Driven by engine

Number of teeth

Inner rotor

9

Outer rotor

10

3. TRANSMISSION CONTROL ELEMENT

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

4. TRANSMISSION GEAR RATIO

 

Gear ratio

1st

2.785

2nd

1.545

3rd

1.000

4th

0.694

Rev

2.272

5. PLANETARY GEAR AND PLATE

Model

1.5 L DOHC

2.0 L DOHC

Number of front sun gear teeth

33

Number of front pinion teeth

21

Number of front internal gear teeth

75

Number of rear sun gear teeth

42

Number of rear pinion teeth

17

Number of rear internal gear teeth

75

Number of high clutch drive plates

3

4

Number of low clutch drive plates

4

5

Number of reverse clutch drive plates

1

2

Number of drive plates for the 2-4 brake

2

3

Number of drive plates for low & reverse brake

4

6. SELECTOR POSITION

P (Park)

Transmission is in neutral, output member is fixed, engine start is possible

R (Reverse)

Transmission is in reverse.

N (Neutral)

Transmission is in neutral and engine start is 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

7. HYDRAULIC CONTROL AND LUBRICATION

Type

Electronic hydraulic control [4 forward gear changes made by electronic signals of vehicle speed and accelerator (throttle) opening]

ATF

Recommended materials

SUBARU ATF

Alternative

IDEMITSU “ATF HP”

Castrol “Transmax J”

Dexron III (KA model only)

CAUTION:

For models other than KA models, if it is impossible to acquire the specified ATF, Dexron III can be used as an emergency measure, but it must be replaced with the specified ATF as soon as possible.

Fluid capacity

1.5 L FWD model

8.0 — 8.3 L (8.5 — 8.8 US qt, 7.0 — 7.3 Imp qt)

1.5 L AWD and 2.0 L

8.4 — 8.7 L (8.9 — 9.2 US qt, 7.4 — 7.7 Imp qt)

Lubrication system

Forced feed lubrication with oil pump

Oil

Automatic transmission fluid (see above)

8. COOLING AND HARNESS

Cooling system

Liquid-cooler

Inhibitor switch

12 poles

Transmission harness

20 poles

9. TRANSFER

Transfer type

Multi-plate transfer (MP-T)

Number of transfer clutch drives & driven plates

4

Control method

Electronic hydraulic type

Lubricant

Same automatic transmission fluid as used in the automatic transmission

Reduction gear ratio of 1st gear

1.000 (53/53)

10. FINAL REDUCTION GEAR

Model

1.5 L DOHC

2.0 L DOHC

Front final reduction gear ratio

4.444 (40/9)

4.111 (37/9)

11. RECOMMENDED GEAR OIL

Lubrication oil

(1)

Item

(3)

API standard

(2)

Front differential gear oil

(4)

SAE viscosity No. and applicable temperature

Front differential oil capacity

L (US qt, Imp qt)

1.1 — 1.3 (1.2 — 1.4, 1.0 — 1.1)