Mitsubishi Outlander (2013+). Manual — part 152

ELECTRONICALLY CONTROLLED 4WD

REAR AXLE

27-6

ELECTRONICALLY CONTROLLED 4WD

GENERAL INFORMATION

M2270000101136

• Electronically controlled 4WD has been adopted

to ensure the on-road performance, achieve
lighter and smaller body, and realize better fuel
economy.

• The electronically controlled 4WD controls the

torque of the electronic control coupling located
between the propeller shaft and rear differential.
This strategy is enabled by varying the torque
distribution to the front and rear wheels from the
status closer to the front wheel drive to the status
closer to the direct coupling 4WD and realizes the
optimal drive force according to the various driv-
ing conditions.

AIMS OF DEVELOPMENT

Lightweight and simple construction of the electroni-
cally controlled 4WD achieves good fuel efficiency
and provides enjoyment of selecting the drive mode.

FUNCTION

• The adoption of the electronic control coupling

prevents the tight corner braking phenomenon

*

and satisfies the traction performance.

NOTE:

*

Tight corner braking indicates the following

condition. When the 4WD vehicle turns sharply
on a pavement at low speed (ex. parallel park-
ing), the rotational radius of the front and rear
wheels differs, and this difference can no longer
be compensated by the tyre slippage. At this
time, the driver feels as if the brake was applied.

• The electronically controlled 4WD receives the

signals of the throttle position and vehicle speed

via CAN

*

communication protocol, detects the

vehicle driving condition and operation of the
driver, and distributes the proper torque to the
rear wheels.

NOTE:

*

: For more information about CAN (Control-

ler Area Network), refer to GROUP 54C

P.54C-2

.

• Under severe driving condition, the system is pro-

tected by minimizing the limitation force of the dif-
ferential.

• During high-speed driving, the fuel efficiency is

improved by reducing the limitation force of the
differential.

• The following drive modes are available accord-

ing to the drivers' preference to provide the enjoy-
ment of selecting functions.

Drive
mode

Control content

Appeal point

4WD
ECO

Minimizes the
limitation force of
the differential.

High fuel efficiency
mode. This mode is
ordinary driven on
efficient 2WD and
provides 4WD
performance on
wheel slipping
conditions.

4WD
AUTO

Increases the
limitation force of
the differential
according to the
different rotation
speed of the front
and rear wheels
and the throttle
position.

Normal mode. This
mode achieves
adequate 4WD
performance on
various conditions,
dried pavement, wet
road, snow road, etc.

4WD
LOCK

Further increases
the limitation force
of the differential
compared to the
4WD AUTO.

High traction mode.
This mode excels at
rough road driving
and escape from
stuck conditions, in
addition, realizes
strong 4WD driving
from low speed to
high speed on
ordinary road.

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ELECTRONICALLY CONTROLLED 4WD

REAR AXLE

27-7

CONSTRUCTION DIAGRAM

System component and function

ACB05569 AC

Engine-ECU

Diagnosis connector

ABS/ASC-ECU

Combination meter

4WD-ECU

4WD switch

Electronic control coupling

ETACS-ECU

Drive mode indicator

< Standard meter>

< High contrast meter>

Drive mode display

CVT-ECU or A/T-ECU

Steering wheel sensor

ECO switch

Parts name

Functional description

Engine ECU

Sends the following signals required by 4WD-ECU via CAN
communication.

• Engine torque signal

• Throttle position signal

• Engine speed signal

CVT-ECU or

A/T-ECU

Sends the following signals required by 4WD-ECU via CAN
communication.

• Gear position signal

ABS/ASC-ECU

Sends the following signals required by 4WD-ECU via CAN
communication.

• ABS sensor signal (4 wheels speed signal)

• ABS/ASC operation signal

• 4WD limitation torque signal

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ELECTRONICALLY CONTROLLED 4WD

REAR AXLE

27-8

Steering wheel sensor

Sends the following signals required by 4WD-ECU via CAN
communication.

• Steering angle signal

4WD switch

Sends the drive mode switch signal (4WD) to 4WD-ECU.

ECO switch

Sends the ECO ON/OFF signal to 4WD-ECU.

ETACS-ECU

Receives drive mode-related information (4WD ECO, 4WD AUTO, 4WD
LOCK), failure information and protection information from the 4WD-ECU,
and then sends them to the combination meter.

4WD-ECU

Calculates the optimum differential limitation force judging from the vehicle
condition and present drive mode based on the signals from each ECU and
switch, and controls the current value flown to the electronic control
coupling.

Controls the indicators (4WD ECO, 4WD AUTO, 4WD LOCK) in the
combination meter.

Controls the self-diagnostic function and fail-safe function.

Controls diagnostic function (Compatible with M.U.T.-III).

Electronic control coupling

Transmits the torque corresponding to the current value controlled by
4WD-ECU to the rear wheels.

Drive mode indicator

Integrated in the combination meter, and indicates the selected drive mode.

• When the 4WD system fails or is protected, the "4WD-E" or"LOCK"

indicator will flash simultaneously or alternately, and the system will
enter the mode which protects automatically the drive system
components, and the drive mode changeover with the 4WD switch will
become unavailable. <Standard meter>

• When the 4WD system fails or is protected, a message will be

displayed, and the system will enter the mode which protects
automatically the drive system components, and the drive mode
changeover with the 4WD switch will become unavailable. <High
contrast meter>

• The drive mode signal from 4WD-ECU is sent to the combination meter

via ETACS-ECU using CAN communication.

Diagnosis connector

Outputs the diagnosis code and establishes the communication with
M.U.T.-III.

Parts name

Functional description

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ELECTRONICALLY CONTROLLED 4WD

REAR AXLE

27-9

System configuration

ACC00455 AC

Engine

ABS/ASC-ECU

Transmission

Combination meter

4WD-ECU

4WD switch

Electronic control coupling

NOTE:The dashed line indicates CAN communication lines (CAN-C, CAN-C-Mid).

Engine-ECU

ETACS-ECU

Diagnosis
connector

CAN-C

CAN-C-Mid

CAN-C

CVT-ECU
or
A/T-ECU

Steering wheel
sensor

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