Mitsubishi Outlander XL. Manual - part 1287

GENERAL INFORMATION

M23506100001USA0000010000

ASC (Active Skid Control System) has been installed.

｠

The  ASC  system  integrates  the  traction  control
function and skid control function.

｠

When Traction control function detects the slip of
the  driving  wheel  (ex.  during  startup  on  slippery
surfaces),  it  automatically  applies  the  brakes  to
control  the  wheel  slip  ratios.  At  the  same  time,
Traction control function reduces the engine output
and prevents the wheel spin.

｠

Skid control function responds to driving conditions
and reduces the engine output and applies brake

force  to  four  wheels  independently  to  control  the
vehicle behavior.

｠

Fail-safe function assures the safety.

｠

Serviceability improvement

｠

For  reduced  wiring  harnesses  and  secure  data
communication, the CAN*communication has been
adopted  as  a  tool  of  communication  with  another
ECU.

NOTE:

｠

*For more information about CAN (Controller Area
Network), refer to GROUP 54D P.54D-7.

｠

ABS and ASC are controlled by the ASC-ECU.

35C-2

ACTIVE STABILITY CONTROL SYSTEM (ASC)

GENERAL INFORMATION

CONSTRUCTION DIAGRAM

ZC600646

CHECK

SE R VIC E
         RE

Q UIRE D

SE R VIC E
         RE

Q UIRE D

ASC 
OFF

0000

10

11

13

11

10

12

1

2

1

2

4

3

8

5

6

7, 9, 17

14

15

16

10

11

13

<Vehicles for CANADA>

<Except vehicles for CANADA>

NAME OF PART

NUM
BER

OUTLINE OF FUNCTION

Sensor

Wheel speed sensor

1

Outputs the frequency signal in proportion to the rotation speed
of each wheel to ASC-ECU.

Magnetic  encoder  for
wheel speed detection

2

The wheel speed sensor is a pulse generator. When the magnetic
encoder for wheel speed detection (a plate on which north and
south pole sides of the magnets are arranged alternately) rotates,
it  outputs  frequency  pulse  signal  in  proportion  to  each  wheel
speed.

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-3

GENERAL INFORMATION

NAME OF PART

NUM
BER

OUTLINE OF FUNCTION

Stoplight switch

3

Outputs  the  signal  indicating  whether  the  brake  pedal  is
depressed or not through ETACS to ASC-ECU via CAN-bus line.

G&yaw rate sensor

4

Detects yaw rate longitudinal (AWD only) and lateral acceleration
of a vehicle, and outputs signal to ASC-ECU via the CAN line.

Steering wheel sensor

5

Detects  the  steering  angle  of  the  steering  wheel,  and  outputs
signal to ASC-ECU via the CAN bus line.

ASC OFF switch

6

Outputs  the  ON/OFF  signal  through  ETACS  to  ASC-ECU  via
CAN-bus line to turn on and off skid control function and traction
control function.

Pressure sensor

7

Integrated into the hydraulic unit, and outputs the signal for the
brake fluid pressure in the master cylinder to ASC-ECU.

Brake fluid level switch

8

Outputs a drop in the brake fluid level in the brake fluid reservoir
tank through ETACS to ASC-ECU via CAN-bus line.

ACTUA
TOR

Hydraulic unit

9

Drives the solenoid valve using the signal from ASC-ECU, and
controls the brake fluid pressure for each wheel.

ABS warning light

10

Informs the driver of the system status by illuminating, flashing,
or turning off the warning light according to the signal from ASC-
ECU.

Brake warning light

11

Used as the warning light for the parking brake, brake fluid level,
and  EBD  control.  Informs  the  driver  of  the  system  status  by
illuminating, flashing, or turning off the warning light according to
the signal from ASC-ECU.

ASC  operation  indicator
light

12

Traction control function and skid control function use the same
display. Depending on the signal from ASC-ECU, the indicator
light informs the driver of the system status by flashing when the
system operates and by illuminating when skid control function or
traction control function has a malfunction.

ASC OFF indicator light 13

Informs  the  driver  of  skid  control  function  and  traction  control
function  shutdown  by  the  signal  from  ASC-ECU.  Informs  the
driver  that  the  brake  system  overheats  and  the  brake  traction
control stops by flashing the indicator light in approximately 2 Hz.

Data link connector

14

Sets  the  diagnostic  trouble  code  and  establishes  the
communication with scan tool.

Engine ECU

15

Controls the engine output based on the signal from ASC-ECU.

AWD-ECU

16

Outputs the drive status to ASC-ECU.

ASC-ECU

17

Controls  actuators  (described  above)  based  on  the  signals
coming from each sensor.
Controls the self-diagnosis and fail-safe functions.
Controls the diagnostic function (scan tool compatible).

35C-4

ACTIVE STABILITY CONTROL SYSTEM (ASC)

GENERAL INFORMATION

System configuration diagram

ZC600659

Wheel speed sensor (FL)

Wheel speed sensor (RL)

Wheel speed sensor (RR)

Wheel speed sensor (FR)

Brake fluid level switch/  
ASC OFF switch/Stoplight switch

ASC-ECU power supply

 Steering wheel sensor

G & yaw rate sensor

 Engine-ECU

AWD-ECU <AWD>

ASC-ECU

Front right suction valve

Front left suction valve

Front left cut valve

Front right cut valve

Front right solenoid valve

 

(OUT)

Front right solenoid valve

 

(IN)

Front left solenoid valve

 

(OUT)

Front left solenoid valve

 

(IN)

Rear right solenoid valve

 

(OUT)

Rear right solenoid valve

 

(IN)

Rear left solenoid valve

 

(OUT)

Rear left solenoid valve

 

(IN)

Data link 
connector

0000

AWD-ECU 
<AWD>

ETACS-ECU

Steering wheel 
sensor

Wheel speed sensor (FL)

Wheel 
speed 
sensor 
(FR)

Front right wheel

Front left wheel

Hydraulic 
unit

Wheel speed sensor (RL)

Wheel 
speed 
sensor 
(RR)

Rear left wheel

Rear right wheel

Stoplight switch

G & yaw late sensor

ASC OFF switch

 Engine-ECU

Combination meter and multi 
information display 
· ASC indicator lamp 
· ASC OFF indicator lamp 
· Brake warning lamp 
· ABS warning lamp

Master cylinder pressure sensor

Brake fluid 
level switch

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-5

GENERAL INFORMATION