Mitsubishi Montero (2002-2004). Manual - part 853

 

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Mitsubishi Montero (2002-2004). Manual - part 853

 

 

GENERAL DESCRIPTION

TSB Revision

AUTOMATIC TRANSMISSION

23Aa-3

.

GENERAL DESCRIPTION

M1231100100114

The automatic transmission comes in one model V5A51.

TRANSMISSION

The transmission is made up of the torque converter and gear train. A 3-element, 1-step, 2-phase torque con-
verter with built-in torque converter clutch is used. The gear train of the V5A51 transmission made up of four 
sets of multiple disc clutches, two sets of multiple disc brakes, one set of band brake, two set of one-way 
clutch and three sets of planetary carriers.

.

TRANSMISSION CONFIGURATION DRAWING

.

ITEM

SPECIFICATION

Model

V5A51

Engine

6G75 (3.8L Engine)

Torque converter type

With torque converter clutch

Transmission type

Electronically controlled 5-speed full automatic

Control elements

Clutch

Multiple disc type 4 sets

Brake

Multiple disc type 2 sets, band type 1 set

One-way clutch

Sprag type 2 set

Gear ratio

1st gear

3.789

2nd gear

2.057

3rd gear

1.421

4th gear

1.000

5th gear

0.731

Reverse gear

3.865

Oil pump type

Gear type

Oil cooling system

Water-cooled type

Transfer type

Active Track 4WD II

Shift ratio

High

1.000

Low

1.900

AC204100

OD

REV

2ND

LR

OWC-L

UD

DIR

RED

OWC-D

AB

GENERAL DESCRIPTION

TSB Revision

AUTOMATIC TRANSMISSION

23Aa-4

COMPONENTS AND FUNCTIONS

FUNCTION ELEMENT TABLE

• × : Function element
• Item marked with an * operate only when stopped [approximately 10 km/h (6.2mph) or less].

COMPONENT

FUNCTION

Underdrive clutch

UD

connects the input shaft to the underdrive sun gear.

Reverse clutch

REV

connects the input shaft to the reverse sun gear.

Overdrive clutch

OD

connects the input shaft to the overdrive planetary carrier.

Direct clutch

DIR

connects the direct sun gear to the direct planetary carrier

Low-reverse brake

LR

holds the low-reverse annulus gear and the overdrive planetary 
carrier.

Second brake

2ND

holds the reverse sun gear.

Reduction brake

RED

holds the direct sun gear.

One-way clutch (Low-
reverse brake)

OWC-L controls rotation direction of the low-reverse annulus gear.

One-way clutch (Direct 
clutch)

OWC-D controls rotation direction of the direct sun gear.

OPERATING ELEMENT

ENGINE 
START

PARKING 
MECHANISM

UNDER-
DRIVE 
CLUTCH 
(UD)

REVERSE 
CLUTCH 
(REV)

OVERDRIVE 
CLUTCH 
(OD)

DIRECT 
CLUTCH 
(DIR)

LOW-
REVERSE 
BRAKE (LR)

SECOND 
BRAKE 
(2ND)

REDUCTION 
BRAKE (RED)

ONE-WAY 
CLUTCH 
(OWC-L)

ONE-WAY 
CLUTCH 
(OWC-D)

TRANSMISSION 
RANGE

P

Parking

OK

X

-

-

-

-

X

-

X

-

-

R

Reverse

-

-

-

X

-

-

X

-

X

-

-

N

Neutral

OK

-

-

-

-

-

X

-

X

-

-

D

1st

-

-

X

-

-

-

X*

-

X

X

X

2nd

-

-

X

-

-

-

-

X

X

-

X

3rd

-

-

X

-

X

-

-

-

X

-

X

4th

-

-

X

-

X

X

-

-

-

-

-

5th

-

-

-

-

X

X

-

X

-

-

-

SPORT 
MODE

1st

-

-

X

-

-

-

X

-

X

X

X

2nd

-

-

X

-

-

-

-

X

X

-

X

3rd

-

-

X

-

X

-

-

-

X

-

X

4th

-

-

X

-

X

X

-

-

-

-

-

5th

-

-

-

-

X

X

-

X

-

-

-

GENERAL DESCRIPTION

TSB Revision

AUTOMATIC TRANSMISSION

23Aa-5

SECTIONAL VIEW

AC100424

1 2

3

4

5 6 7 8 9 10 11 12 13 14 15 16

17 18 19 20 21

27

26

AB

22 23 24 25

29

28

30

32

31

33

 

 1. 

TORQUE 

CONVERTER 

CLUTCH

 

 

2. TORQUE 

CONVERTER

 

 

3. OIL 

PUMP

 

 

4. OVERDRIVE 

CLUTCH

 

 

5. REVERSE 

CLUTCH

 

 

6.  OVERDRIVE PLANETARY CARRIER

 

 

7. SECOND 

BRAKE

 

 

8.  OUTPUT PLANETARY CARRIER

 

 

9. LOW-REVERSE 

BRAKE

 

 

10. ONE-WAY CLUTCH

 

 

11. CENTER SUPPORT

 

 

12. UNDERDRIVE CLUTCH

 

 

13. DIRECT CLUTCH

 

 

14. REDUCTION BRAKE BAND

 

 

15. ONE-WAY CLUTCH

 

 

16.  OUTPUT SHAFT SUPPORT

 

 

17. PARKING GEAR

 

 

18.  TRANSFER INPUT GEAR

 

 

19. H-L CLUTCH

 

 

20.  LOW SPEED GEAR

 

 

21.  DIFFERENTIAL LOCK HUB

 

 

22.  2-4WD SYNCHRONIZER SLEEVE

 

 

23. DRIVE SPROCKET

 

 

24. CHAIN

 

 

25. VISCOUS COUPLING

 

 

26. CENTER DIFFERENTIAL

 

 

27. REAR OUTPUT SHAFT

 

 

28. TRANSFER DRIVE SHAFT

 

 

29. FRONT OUTPUT SHAFT

 

 

30. TRANSFER COUNTER GEAR

 

 

31. OUTPUT SHAFT

 

 

32. VALVE BODY

 

 

33. INPUT SHAFT

GENERAL DESCRIPTION

TSB Revision

AUTOMATIC TRANSMISSION

23Aa-6

ELECTRONICALLY-CONTROLLED SYSTEM

.

INVECS-II

• When in drive ("D" range), the new automatic transmission 

employs an innovative shift schedule to provide a high level 
of comfort and "easy driving style" that matches all driving 
conditions as well as the driver's driving style.

• INVECS-II features "Optimum Shift Control," which provides 

shift timing the average driver perceives to be the optimum 
timing under any road conditions "Adaptive Shift Control" 
adjusts shift timing to match the driving habits and prefer-
ences of individual drivers.

.

FEATURES

OPTIMUM SHIFT CONTROL

1. The shift patterns found satisfying by the typical driver for all 

ranges of driving are stored in the computer's memory. The 
computer uses this data to analyze road conditions and the 
driver's style of operation, and then outputs the optimal shift 
patterns stored in its memory to best match the conditions.

2. We introduce the latest in control technologies with an inno-

vative new algorithm called the "neural network" that works 
to imitate the decision-making processes of the human 
brain. The neural network links a wide variety of input data 
regarding road and operating conditions, and instantly 
makes accurate shift control decisions.

.

ADAPTIVE SHIFT CONTROL

1. The computer learns the driving habits and pref-

erences of each individual driver by processing 
driving data on engine output, tire load, foot brake 
operation, etc. It then uses this data to adjust shift 
timing to best suit the driver's style.

2. If the computer determines from the driving pat-

terns that the driver is one who enjoys a relaxed, 
unhurried style, it adjusts timing to execute up-
shifts at a lower engine speed to provide a 
smooth, quiet ride. On the other hand, if the com-
puter determines the driver to prefer a sporty ride, 
it adjusts timing to shift up at a higher engine 
speed to provide more powerful response.

AC000841AB

WITH INVECS-II

WITHOUT
INVECS-II

OPTIMUM SELECTION OF GEARS

LEVEL ROAD

ALL DRIVING CONDITIONS

DRIVER'S HABITS AND
PREFERENCE

AC000842

ACCELERATOR
POSITION

VEHICLE SPEED

FOOT BRAKE

OPTIMUM
GEAR
SELECTION

MANUAL SHIFT
OPERATION
DATA OF A
NUMBER
DRIVER'S

DECISION

ROAD
CONDITION
AND DRIVING
OPERATION

COMPUTER

OPTIMUM CONTROL

AB

AC000843

ACCELERATOR
POSITION

VEHICLE SPEED

FOOT BRAKE

OPTIMUM
GEAR
SELECTION

DATA
PROCESSED

INTERRE-
LATED

DECI-
SION

COMPUTER

NEURAL NETWORK

AB

 

 

 

 

 

 

 

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