Mitsubishi Evolution X. Manual - part 154

35C-1

GROUP 35C

ACTIVE SKID 

CONTROL SYSTEM 

(ASC)

CONTENTS

GENERAL INFORMATION . . . . . . . .

35C-2

CONSTRUCTION DESCRIPTION . . .

35C-8

SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . 

35C-8

ACTUATOR  . . . . . . . . . . . . . . . . . . . . . . . . 

35C-10

ASC-ECU  . . . . . . . . . . . . . . . . . . . . . . . . . . 

35C-11

DESCRIPTION OF CONSTRUCTION 

 

AND OPERATION  . . . . . . . . . . . . . . .

35C-14

GENERAL INFORMATION

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-2

GENERAL INFORMATION

M2355000100296

Active skid control (ASC) has been equipped as a 
standard.

• ASC has been added to the transaxle <twin 

clutch sportronic shift transmission (TC-SST)

*1

> 

control and AWD <super all wheel control 
(S-AWC)

*2

>, and the controls are integrated to 

improve the vehicle stability.

• The ASC system integrates the traction control 

(TCL) function and skid control function.

• When the TCL function detects the slip of driving 

wheel (for example, during startup on slippery 
road), it automatically applies the braking force to 
the slipping driving wheel. At the same time, TCL 
reduces the engine output and prevents the 
wheel spin when it determines that the engine 
torque is too high for the road surface friction 
coefficient.

• When the skid control function determines that 

the vehicle behavior is in a critical state, it 
reduces the engine output and applies brake 
force to four wheels independently to control the 
vehicle behavior, avoiding the critical state.

• Brake performance at ASC system failure is 

ensured by the fail-safe function, and at the same 
time, the serviceability during service is 
improved.

NOTE: 

.

•

*1

: For the details on twin clutch sportronic shift 

transmission (TC-SST), refer to GROUP 22B 

−

 

Twin Clutch Sportronic Shift Transmission 
(TC-SST) 

P.22B-2

.

•

*2

: For the details on super all wheel control 

(S-AWC), refer to GROUP 22B 

−

 Super All Wheel 

Control (S-AWC) 

P.22B-18

.

•

The active skid control (ASC) has the traction 
control function and the skid control function. By 
the integrated control with the anti-lock brake 
system, the system stabilizes the vehicle attitude 
and, at the same time, secures the driving force.

.

GENERAL INFORMATION

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-3

CONSTRUCTION DIAGRAM

.

AC708742

CHECK

SERVICE
         REQUIRED

SERVICE
         REQUIRED

10

12

13

11

15

14

17

5

3

19

AB

1

1

2

2

4

20

16

7, 8, 9, 22

6

18

21

GENERAL INFORMATION

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-4

MAIN COMPONENTS AND FUNCTIONS

Parts name

No. Functional description

Sensor

Wheel speed sensor

1

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

Magnetic encoder for 
wheel speed detection

2

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

Stop light switch

3

Outputs the signal indicating whether the brake pedal 
is depressed or not to ASC-ECU.

G and yaw rate sensor

4

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

Steering wheel sensor

5

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

ASC OFF switch

6

Outputs the ASC ON/OFF signal to ASC-ECU.

Master cylinder pressure 
sensor

7

Integrated into the hydraulic unit, converts the signal of 
brake fluid pressure in master cylinder to the voltage 
value, then outputs the value to ASC-ECU.

Wheel cylinder pressure 
sensor

8

Integrated into the hydraulic unit, converts the signal of 
brake fluid pressure in wheel cylinder of each wheel to 
the voltage value, then outputs the value to ASC-ECU.