Mitsubishi Evolution X. Manual - part 48

ENGINE CONTROL

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ENGINE AND EMISSION CONTROL

17-2

ENGINE CONTROL

GENERAL INFORMATION

M2170001000905

For the accelerator system, an electronic throttle 
valve control system has been adopted, disposing of 
an accelerator cable. This system detects the accel-
erator pedal travel by using a accelerator pedal posi-
tion sensor (APS) in the accelerator pedal assembly 
for electronic control of the throttle valve angle.

To the arm of accelerator pedal assembly, a resin 
arm is employed in order to reduce weight.
Also, the aluminum pedal pad has been adopted to 
enhance the sporty image.

CONSTRUCTION DIAGRAM

AC613376AB

Accelerator pedal assembly
[Built-in accelerator pedal position
sensor (APS)]

Resin arm

Aluminum pedal pad

AUTO-CRUISE CONTROL SYSTEM

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ENGINE AND EMISSION CONTROL

17-3

AUTO-CRUISE CONTROL SYSTEM

GENERAL INFORMATION

M2170001000897

By using the cruise control system, the driver can 
drive at preferred speeds in a range of approximately 
40 to 200 km/h (25 to 125 mph) without depressing 
the accelerator pedal.

For this cruise control system, in conjunction with the 
electronic throttle valve control system, the engine 
control module (ECM) electronically controls the 
throttle valve. 

CONSTRUCTION DIAGRAM

AC708691

AC708693

AC708696

AC708692

CANCEL

ACC

RES

ON

OFF

COAST

SET

AC708694

AC708695

Cruise control switch

Data link connector

Hood
lock
release
handle

AB

Clutch switch <M/T>

Stoplight switch

Accelerator pedal
[Built-in accelerator 
pedal position sensor
(APP sensor)]

Engine control
module (ECM)

"CRUISE" indicator light

Transaxle assembly
[Built-in twin clutch
-sportronic shift
transmission-ECU
(TC-SST-ECU)]
<TC-SST>

Throttle body
[Built-in throttle position sensor
(TP sensor) and 
throttle actuator control motor
(TAC motor)]

Hydraulic unit Assembly
(Built-in ASC-ECU)

Shift lever assembly
(Built-in shift lever ECU)
<TC-SST>

Steering wheel

AUTO-CRUISE CONTROL SYSTEM

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ENGINE AND EMISSION CONTROL

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COMPONENTS AND FUNCTIONS

Component

Function

Accelerator pedal position sensor (APP sensor)

Informs the ECM of the accelerator pedal 
depression.

ASC-ECU

• Outputs the cruise control cancel signal to ECM.

• The vehicle speed signal is sent to the ECM.

Clutch switch <M/T>

Because the constant speed driving is cancelled by 
the clutch operation, the clutch pedal status is 
detected.

"CRUISE" indicator light

• The light is included in the combination meter and 

illuminates when the "ON/OFF" switch is pressed 
(cruise control system: ON).

• Depending on the flashing status of indicator light, 

it displays the diagnostic trouble code signal of 
cruise control system.

Cruise control switch

"ON/OFF" switch

Power switch for cruise control system.

"ACC/RES" switch

Vehicle speed is set with the "ACC/RES" switch and 
"COAST/SET" switch.

"COAST/SET" switch
"CANCEL" switch

Cancels the cruise speed setting.

Data link connector

If the scan tool is connected, the input check code 
from the ECM can be read.

Engine control module (ECM)

• Based on the input signal from each sensor and 

switch, it outputs the target throttle valve opening 
angle signal to the TAC motor.

• Based on the input signal from each sensor and 

switch, it outputs the shift control signal to the 
TC-SST-ECU <TC-SST>.

• Based on the vehicle speed signal from the 

ASC-ECU, it calculates the vehicle speed.

• Based on the shift lever "N" position signal of the 

shift lever ECU from the TC-SST-ECU, it cancels 
constant speed driving <TC-SST>.

• Outputs the ON/OFF signals of "CRUISE" 

indicator light and cruise control system.

• The diagnostic trouble code signal is sent to the 

"CRUISE" indicator light.

• The input check code is sent to the data link 

connector.

Shift lever ECU <TC-SST>

Because the constant speed driving is cancelled by 
the shift lever operation, it detects the "N" position.

Stoplight switch

• Because the constant speed driving is canceled 

by the brake operation, it detects the brake pedal 
status.

• As for the stoplight switch, two built-in switches, 

the stoplight switch which is also used for the 
stoplight illumination and the brake switch which 
is used exclusively for the cruise control, are 
integrated, and thus the reliability is enhanced.

AUTO-CRUISE CONTROL SYSTEM

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ENGINE AND EMISSION CONTROL

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CONSTRUCTION AND OPERATION

M2170002000403

SYSTEM OUTLINE

The cruise control section in ECM calculates the 
cruise control system operation status based on the 
signals sent from switches and sensors.Based on 
the calculation, the cruise control section outputs the 
target accelerator pedal opening angle signal to the 
engine control section, and shift control signal to 
TC-SST-ECU <TC-SST>, and "CRUISE" indicator 
light ON/OFF signal to the combination meter.

In the engine control section, the target accelerator 
pedal opening angle value is calculated based on the 
target accelerator pedal opening angle signal from 
the cruise control section, actual accelerator pedal 
opening angle signal from the APP sensor, and the 
throttle valve opening angle signal from the TP sen-
sor, and the vehicle speed is controlled by the driving 
of TAC motor.

BLOCK DIAGRAM

Throttle actuator control motor (TAC motor)

The throttle valve opens and closes in response to 
the target throttle valve opening angle signal from 
the ECM.

Throttle position sensor (TP sensor)

Informs the ECM of the throttle valve opening angle.

Twin clutch-sportronic shift transmission-ECU 
(TC-SST-ECU)

• Based on the transaxle control signal from the 

ECM, it controls the transaxle.

• Transmits the shift lever "N" position signal from 

the shift lever ECU sent to the ECM.

• TC-SST drive mode signal from the shift lever 

ECU sent to the ECM.

Component

Function

AC708697

TAC motor

Target accelerator pedal
opening angle signal

Engine control section

Cruise control section

"CRUISE" indicator light

Actual 
accelerator 
pedal opening
angle signal

Target
throttle 
valve
opening
angle
signal

Cruise control switch

ECM

"CRUISE"
indicator
light
ON/OFF
signal

APP sensor

Shift
lever
position
signal

Shift
control
signal

Cruise
control
switch
ON/OFF
signal

Shift lever-ECU <TC-SST>

Shift
lever
position
signal

TC-SST-ECU <TC-SST>

Vehicle
speed
signal

Cruise
control
cancel
signal 

ASC-ECU

TP sensor

Throttle 
valve
opening
angle
signal

Stoplight
switch
signal

Brake
switch
signal

Clutch
switch
signal

Stoplight switch

Clutch switch <M/T>

TC-SST
drive
mode
signal

TC-SST
drive
mode
signal