Mitsubishi Outlander XL. Manual - part 1288

NOTE: 

The dotted line indicates the CAN-bus line.

CONSTRUCTION DESCRIPTION

SENSOR

M23506100003USA0000010000

Wheel speed sensor

Refer to GROUP 35B, SENSOR P.35B-6.

G AND YAW RATE SENSOR

ZC3055990000

G&yaw rate sensor

This sensor is installed under the front floor console, and detects
the yaw rate, lateral and longitudinal acceleration (AWD) of the
vehicle. ABS employs the longitudinal acceleration.

STEERING WHEEL SENSOR

ZC6000060000

Steering wheel sensor

The steering wheel sensor is attached to the column switch, and
detects the rotational angle of the steering wheel.

ASC OFF SWITCH

ZC5019530000

ASC off switch

The ASC OFF switch is attached on the instrument panel to the
left  side  of  the  driver's  seat.  Traction  control  and  skid  control
functions  can  be  deactivated  by  pressing  this  switch  for  3
seconds or longer. Pressing this switch again resumes the active
state. Pressing the ASC OFF switch for 15 seconds resumes the
system  to  the  active  state,  and  the  traction  control  and  skid
control function cannot be turned off until the ignition switch is
turned on next time.
When the ignition switch is turned from "LOCK" (OFF) to ON
position, traction control and skid control functions are constantly
in the active state.

35C-6

ACTIVE STABILITY CONTROL SYSTEM (ASC)

CONSTRUCTION DESCRIPTION

ASC OFF switch operation and system operation

ASC OFF switch control Traction control function

Skid control function

Brake control

Engine control

ON

Enabled

Enabled

Enabled

OFF

Prohibited

Prohibited

Prohibited

NOTE: 

The Skid control function is available when the

vehicle speed is about 15 km/h or more.

ACTUATOR

M23506100004USA0000010000

HYDRAULIC UNIT
The  hydraulic  unit  incorporates  the  ABS  and  ASC.
The  cut  valve,  pressure  relief  valve,  suction  valve,

suction  damper,  and  pressure  sensor  have  been
added to the unit for the ASC.

NOTE: 

For the internal hydraulic circuit of the

hydraulic unit, refer to P.35C-6.

ASC OPERATION INDICATOR LAMP, ASC OFF INDICATOR LAMP
The  ASC  system  illuminates  or  flashes  the  ASC
operation indicator light or ASC OFF indicator light in
the  following  operation  patterns,  and  informs  the
driver of the ASC system status.

ASC operation indicator light

｠

Flashes in 2 Hz during the skid control.

｠

Flashes in 2 Hz during the traction control.

｠

Turns ON when the system malfunction occurs.

ASC OFF indicator light

｠

ASC-ECU detects the overheat of the brake pads.
When  the  brake  traction  control  is  prohibited,  the
ASC OFF indicator light flashes in approximately 2
Hz.

｠

Turns ON when the system malfunction occurs.

｠

Turns ON when the ASC OFF switch is pressed for
3 seconds or more, and the traction control function
and the skid control function are disabled.

 

ASC operation indicator light, ASC OFF indicator light illumination and flashing patterns

State

ASC operation indicator light

ASC OFF indicator light

Normal

Normal

-

-

Skid

 control

 function

operated

Flashing (2 Hz)

-

Traction  control  function
operated

Flashing (2 Hz)

-

Brake  traction  control
function does not function
to protect brake system.

-

Flashing (2 Hz)

Abnorm
al

Skid

 control

 function

malfunction

ON

ON

Traction  control  function
malfunction

ON

ON

Scan
tool
connecti
on

Actuator not operated

-

-

Actuator operated

ON  (After  the  actuator  is
operated)*1

ON  (After  the  actuator  is
operated)*1

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-7

CONSTRUCTION DESCRIPTION

State

ASC operation indicator light

ASC OFF indicator light

OFF  (When  the  actuator  is
operating)*2

OFF  (When  the  actuator  is
operating)*2

NOTE:

｠

*1After  the  actuator  is  operated,  the  light  stays
illuminated until the ignition switch is turned to the
"LOCK" (OFF) position.

｠

*2The ABS warning light flashes (2 Hz) while the
actuator is operating.

ASC-ECU

M23506100005USA0000010000

This  ECU  incorporates  the  ABS  function,  EBD
function,  Skid  control  function,  and  Traction  control
function.

SYSTEM CONFIGURATION
The hydraulic units of the ASC employ the automatic
pressurization

 function.

 ASC

 systems

 also

incorporate  G  and  yaw  rate  sensor,  steering  wheel
sensor,  and  master  cylinder  pressure  sensor
(integrated with hydraulic unit).

CONTROL DESCRIPTION
ASC-ECU  detects  vehicle  movement  based  on
information  from  various  sensors  and  calculates  a
model  of  ideal  vehicle  movement.  ASC-ECU
compares the actual vehicle movement with the ideal
vehicle model, and manages the brake of the specific
wheel so that the actual vehicle movement gets close
to the ideal vehicle mode. It also controls the plowing
out  or  spinning  out  condition  by  creating  the  yaw
moment in the vehicle.

Example of Active Skid Control operation

ZC600705

<Generation of rotating force>

<Generation of counter-rotating force>

0000

Large braking 
force

Large braking 
force

The  Skid  Control  manages  the  vehicle  attitude  by
creating  a  yaw  moment  from  altering  the  balance
between the cornering force and each wheel's braking
mechanism.
For example, on a slippery surface, if the vehicle tends
to be plowing out contrary to the driver’s intention, a
yaw  moment  (a  rotational  moment)  is  created  to

restrain the plowing out by increasing the rear-inside
braking  force.  On  the  other  hand,  when  the  vehicle
tends to be spinning out, a yaw moment (a restorative
moment)  is  created  to  restrain  the  spinning  out  by
increasing  the  front-outside  wheel  braking  force.
Furthermore, when it is determined that the vehicle is
spinning out, safe and stable cornering is enabled by
deceleration from reducing the engine output.

35C-8

ACTIVE STABILITY CONTROL SYSTEM (ASC)

CONSTRUCTION DESCRIPTION

Example of the effect of control

AC204504

AC204505

AC204506

ZC600706

Suppression of plowing out

Suppression of spinning out

Improvement in ABS performance

Vehicle balance stable  
after avoiding collision 
with obstacles

Prevention of deviation 
from the course by 
understeer

Avoidance of spinning 
by tacking in

0000

Joint control
Skid  control  function  transmits  data  necessary  for
control  of  ABS  and  traction  control  function,
performing joint control.

Control system

Control content

ABS

Even during skid control operation, ABS performance is improved from the
joint operation of the skid control.

Traction control function

During acceleration, engine output is governed through joint operation with
skid control function.

Example of traction control function

Traction  control  function  applies  the  brake
automatically,  sends  the  signal  requesting  engine
speed reduction to the engine ECU, and prevents the
loss of the driving force resulting from the slippage of

the driving wheel, when the driving wheels slip on the
slippery road surface.

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-9

CONSTRUCTION DESCRIPTION