Mitsubishi Evolution X. Manual - part 155

GENERAL INFORMATION

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-5

NOTE: 

.

•

*1

: For information on AYC (Active Yaw Control), 

refer to GROUP 22B 

−

 Super All Wheel Control 

(S-AWC), Description of Structure and Operation 

P.22B-18

.

•

*2

: Only for vehicles with TC-SST

.

Actuator

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.

ABS warning display

11

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

Brake warning light

12

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

Brake warning display

13

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

ASC operation display

14

According to the signal from ASC-ECU, flashes when 
the system is active to inform the driver of the status.

ASC warning display

15

The TCL function and ASC function use the same 
display. According to the signal from ASC-ECU, the 
display is illuminated to inform the driver that the 
system is abnormal.

ASC OFF light

16

Informs the driver of the ASC system shutdown by 
illuminating according to the signal from ASC-ECU.

ASC OFF display

17

Using the signal from ASC-ECU, the display is 
illuminated to inform the driver that the ASC OFF 
switch is pressed and held for 3 seconds, and that the 
ASC and AYC

*1

 brake control is prohibited.

Data link connector

18

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

Engine control module

19

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

TC-SST ECU

*2

20

*2

Outputs the shift position to ASC-ECU.

S-AWC ECU

21

Outputs the drive status and brake fluid pressure 
request to ASC-ECU.

ASC-ECU

22

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

Parts name

No. Functional description

GENERAL INFORMATION

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-6

SYSTEM CONFIGURATION

.

AC704103

ASC OFF switch

G&yaw rate sensor

Engine ECU

S-AWC-ECU

TC-SST-ECU

ASC-ECU

ETACS-ECU

AB

Local CAN

CAN-C

CAN-B

Stop light switch

Combination meter

Steering wheel sensor

Wheel
speed
sensor
(RR)

Wheel
speed
sensor
(RL)

Wheel speed
sensor (FL)

Wheel speed
sensor (FR)

GENERAL INFORMATION

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-7

ASC ELECTRICAL DIAGRAM

M

(FL)

(FR)

(RL)

(RR)

AC704112

No.9
15A

No.5
10A

No.17
10A

No.2
15A

ON

OFF

No.12
7.5A

No.8
7.5A

ETACS-
ECU

No.30
30A

ON

OFF

CPU

Engine ECU

Selecter lever

Transmission 
assembly

CPU

Rheostat

LCD(BRAKE, ABS, ASC OFF, 
ASC FAILURE, ASC ACTIVE,
TARMAC, GRAVEL, SNOW,
ACD, AYC)

LED driver

ABS

BRAKE

ON

OFF

ASC OFF
switch

ON

OFF

S-AWC
switch

<Vehicles without
S-AWC switch>

Steering wheel
sensor

S-AWC-ECU

Pressure sensor

Direction 
valve
(for ACD)

MODE(-)

MODE(+)

ILL

ILL

ILL

Spare connector

Steering wheel
S-AWC switch

ASC-ECU

G and yaw rate 
sensor

ON

OFF

AB

Fusible link No.34

Ignition switch (IG1)

Analog
interface

Analog
interface

CAN driver

Interface

CAN driver

Interface

CAN driver

Interface

Fusible link No.36

Relay box

Combination meter

Back-up power supply

Clock spring

Solenoid valve power supply

Pressure
sensor

Pressure
sensor

Pressure
sensor

Pressure
sensor

Pressure
sensor

Solenoid valve

Hydraulic unit

Motor power supply

Motor power supply

Fusible
link No.27

Fusible
link No.26

Solenoid valve power supply

Power
supply

Wheel speed sensor

Magnetic
pump

Fusible
link No.35

Power
supply

Data link
connector

Stop
light
switch

Stop light,
shift lock

Interface

Interface

CAN transceiver

Direction 
valve
(for AYC)

Direction 
valve
(left)

Direction 
valve
(right)

CONSTRUCTION DESCRIPTION

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ACTIVE SKID CONTROL SYSTEM (ASC)

35C-8

CONSTRUCTION DESCRIPTION

SENSOR

M2355001100158

WHEEL SPEED SENSOR

Refer to GROUP 35B 

− Sensor 

P.35B-5

.

STEERING WHEEL SENSOR

Refer to GROUP 35B 

− Sensor 

P.35B-5

.

G AND YAW RATE SENSOR

This sensor is installed under the instrument panel center 
lower, and detects the yaw rate as well as the lateral and longi-
tudinal acceleration of the vehicle.

ASC OFF SWITCH

The ASC OFF switch is installed to the instrument panel to the 
right of driver seat. By the operation of this switch, the TCL 
function, skid control function, and AYC brake control can be 
enabled or prohibited. As a countermeasure against the ASC 
OFF switch sticking, the ASC system returns to the ON status 
when the ASC OFF switch is pressed and held for 15 seconds.
When the ignition switch is turned from "LOCK" (OFF) to ON 
position, the TCL function and skid control function are con-
stantly in the ON status.

.

AC613534

AB

SRS-ECU

G&yaw rate sensor

AC708751

ASC

OFF

AB

ASC OFF switch