Mitsubishi Outlander XL. Manual - part 561

GENERAL INFORMATION

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｠

Electronic control AWD has been adopted to ensure
the  on-road  performance,  achieve  lighter  and
smaller body, and realize better fuel economy.

｠

The electronic control AWD 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 AWD and realizes the optimal drive force
according to the various driving conditions.

AIMS OF DEVELOPMENT
Lightweight and simple construction of the electronic
control  AWD  achieves  good  fuel  efficiency  and
provides enjoyment of selecting the drive mode.

FUNCTION

｠

The  adoption  of  the  electronic  control  coupling
satisfies  both  of  the  tight  corner  braking
phenomenon*and traction performance.

NOTE: 

 *Tight corner braking indicates the

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

｠

The electronic control AWD 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

(Controller Area Network), refer to GROUP 54C .

｠

Under  severe  driving  condition,  the  system  is
protected by minimizing the limitation force of the
differential.

｠

During  high-speed  driving,  the  fuel  efficiency  is
improved  by  reducing  the  limitation  force  of  the
differential.

｠

The following drive modes are available according
to the drivers' preference to provide the enjoyment
of selecting functions.

Drive
mode

Control content

Appeal points

FWD

Minimizes

 the

limitation  force  of
the differential.

High  fuel  efficiency
mode  which  enables
smoother

 turning

performance  of  the
FF vehicle

AWD

Increases

 the

limitation  force  of
the

 differential

according  to  the
different  rotation
speed  of  the  front
and  rear  wheels
and  the  throttle
position.

Universal

 mode

which  automatically
distributes  the  drive
force  to  the  rear
wheels as necessary

LOCK

Further  increases
the limitation force
of  the  differential
compared  to  the
AWD mode.

Mode  which  has  an
excellent

 driving

performance

 when

driving on rough road
or  in  stuck  situation
and

 enables

 the

powerful driving

ELECTRONIC CONTROL AWD

27C-3

GENERAL INFORMATION

CONSTRUCTION DIAGRAM

ZC5018010001

Drive mode
selector

Drive mode indicator

Drive mode indicator

Vehicles for Canada

Vehicles for USA

ASC-ECU

AWD-ECU

ETACS-ECU

Electronic
control
coupling

Drive mode
selector

Engine-ECU

Diagnosis
connector

Combination
meter

 

System component and function

Parts name

Functional description

Engine ECU

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

27C-4

ELECTRONIC CONTROL AWD

GENERAL INFORMATION

Parts name

Functional description

｠

Engine torque signal

｠

Throttle position signal

｠

Engine speed signal

ASC-ECU

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

｠

ABS sensor signal (wheel speed signal) [4 wheels]

｠

ABS operation signal

｠

AWD limitation torque signal

Drive mode selector

Sends the drive mode switch signal [FWD/AWD/LOCK] to AWD-ECU.

ETACS-ECU

｠

Receives  the  drive  mode  switch  signal  [FWD/AWD/LOCK]  from  AWD-
ECU  and  flashes  the  indicators  (AWD  operation  indicator  and  LOCK
indicator) in the combination meter.

｠

Flashes the indicators (AWD operation indicator and LOCK indicator) in
the combination meter in case of failure.

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

AWD-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 (AWD operation indicator and LOCK indicator) 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 AWD-
ECU to the rear wheels.

Drive mode indicator

｠

AWD operation indicator

｠

LOCK indicator

Integrated in the combination meter, and indicates the selected drive mode
(Not displayed in FWD mode).

｠

When the AWD operation indicator and LOCK indicator flash alternately,
the system automatically enters the front wheel drive mode to protect the
drive system components, and the drive mode changeover with the drive
mode selector becomes unavailable.

｠

When  the  drive  system  generates  heat,  the  AWD  operation  indicator
flashes.

｠

The  indicator  lamp  operation  signal  from  AWD-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.

SERVICE PRECAUTIONS

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TOWING

｠

The vehicle must be towed by a tow truck with all
four wheels raised. If a vehicle is towed with only
the front or rear wheels are raised, the drive system
components may be damaged or the vehicle may
jump out of a tow truck (cart).

｠

Even  if  the  drive  mode  selector  is  switched  to
"FWD," the vehicle cannot be towed with only the

front  or  rear  wheels  raised.  The  vehicle  must  be
towed by a tow truck with all four wheels raised.

ELECTRONIC CONTROL AWD

27C-5

SERVICE PRECAUTIONS

WHEEL AND TIRE
Normally, all four tires must be same in size, in type,
and  in  brand,  except  for  when  a  spare  tire  is
temporarily used. If a wheel or tire with incorrect size
is installed or tire pressure is excessively out of the
specified  value,  the  electronic  control  AWD  system
will  not  operate  correctly.  In  addition,  drive  system
components may be damaged.

DRIVING ON SANDY OR SLUSHY ROAD
As the vehicle is intended for on-road use, long-time
driving on a sandy or slushy road must be avoided.
When the vehicle is driven on a sandy or slushy road

for a long time, the fail-safe function of the electronic
control  AWD  system  tends  to  enter  the  protective
control mode which switches the control from AWD to
FWD gradually in order to protect the drive system,
and  the  indicators  ("AWD"  and  "LOCK")  tends  to
illuminate.

SPEED MEASUREMENT
When using the chassis dynamometer to measure the
speed, always measure with 4 wheels in free state. If
the  speed  is  measured  with  front  wheels  or  rear
wheels  fixed,  drive  system  components  may  be
damaged.

SERVICE SPECIFICATIONS

M12704100002USA0000010000

Item

Standard value

Electronic control coupling solenoid resistance Ω [20 °C (68°F)]

2.2 - 4.0

Electronic control coupling stud bolt length mm (in)

22.3 - 25.1 (0.88 - 0.99)

SEALANT

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Item

Specified sealant

Differential  carrier  and
electronic  control  coupling
mounting part

3M™ AAD Part No.8672, 8679, 8678, 8661, 8663 or equivalent

27C-6

ELECTRONIC CONTROL AWD

SERVICE SPECIFICATIONS