Mitsubishi Evolution X. Manual - part 1092

GENERAL INFORMATION

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-3

STRUCTURE

• A gateway function has been integrated to 

ETACS-ECU as the network central ECU.

• The CAN system consists of the following three 

networks: CAN-B (middle-speed body network), 
CAN-C (high-speed power train network), and the 
diagnosis CAN-C (diagnosis exclusive network). 
Each ECU is connected to one of the networks 
depending on its functions.

• The CAN bus line consists of two lines, CAN_L 

and CAN_H (CAN Low and CAN High, respec-
tively), as well as two terminal resistors (A 
twisted-pair cable, highly resistant to noise, is 
used for the communications line).

• The CAN bus line connecting two dominant 

ECUs is the main bus line, and the CAN bus line 
connecting each ECU is the sub-bus line.

• With CAN-C, the terminal resistors are incorpo-

rated in ECU. Resistors with approximately 120 
ohms is used for the dominant ECU, and that with 

3.0 kiloohms is used for the non-dominant ECU.
NOTE: 

.

AC709105

ECM

SRS-ECU

A/C-ECU

CAN box 
unit

Satellite 
radio tuner

Hands free
module

Radio and 
CD player or 
CD changer

Combination 
meter

WCM OR 
KOS-ECU

Scan tool

Data link 
connector

ETACS-ECU

ASC-ECU

CAN_H

CAN_L

Main bus line

CAN_H

CAN_L

CAN_H

CAN_L

CAN-C

CAN-B

Diagnosis CAN-C

AB

Terminal resistor

Terminal 
resistor

: Indicates main bus line

: Indicates sub bus line

Occupant
classification-
ECU

Main bus line

TC-SST-
ECU

Shift lever

S-AWC-
ECU

Steering
wheel
sensor

GENERAL INFORMATION

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-4

•

Dominant ECU: ETACS-ECU and engine 
ECU

•

Non-dominant ECU: ECU and sensor on 
CAN-C network, excluding ETACS-ECU and 
engine ECU

• To the CAN bus line, ECU, sensor, and data link 

connector are connected as follows for each net-
work.
CAN-B

• Wireless control module (WCM) <vehicles 

without KOS>

• KOS-ECU <vehicles with KOS>

• SRS-ECU

• Occupant classification-ECU

• A/C-ECU

• Radio and CD player or CD changer <vehi-

cles without Mitsubishi Multi-Communication 
System (MMCS)>

• CAN box unit <vehicles with Mitsubishi 

Multi-Communication System (MMCS)>

• Hands free module <vehicles with hands-free 

system>

• Satellite radio tuner <vehicles with satellite 

radio>

• Combination meter

CAN-C

• ASC-ECU

• TC-SST-ECU <TC-SST>

• Shift lever <TC-SST>

• S-AWC-ECU

• Steering wheel sensor

• Engine control module (ECM)

Diagnosis CAN-C

• Data link connector

SPECIAL TOOLS

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CONTROLLER AREA NETWORK (CAN)

54C-5

SPECIAL TOOLS

M1548304200477

Tool

Tool number and 
name

Supersession

Application

MB991958

a. MB991824
b. MB991827
c. MB991910
d. MB991911
e. MB991914
f. MB991825
g. MB991826

M.U.T.-III sub 
assembly

a. Vehicle 

communication 
interface (V.C.I.)

b. M.U.T.-III USB 

cable

c. M.U.T.-III main 

harness A 
(Vehicles with 
CAN 
communication 
system)

d. M.U.T.-III main 

harness B 
(Vehicles without 
CAN 
communication 
system)

e. M.U.T.-III main 

harness C (for 
Daimler Chrysler 
models only)

f. M.U.T.-III 

measurement 
adapter

g. M.U.T.-III trigger 

harness

MB991824-KIT
NOTE: G: MB991826 
M.U.T.-III Trigger 
Harness is not 
necessary when 
pushing V.C.I. ENTER 
key.

CAUTION

M.U.T.-III main harness A 
(MB991910) should be used. 
M.U.T.-III main harness B and C 
should not be used for this 
vehicle.
CAN bus diagnostics

MB991910

MB991826

MB991958

MB991911

MB991914

MB991824

MB991827

MB991825

DO NOT USE

a

b

c

d

e

f

g

DO NOT USE

TEST EQUIPMENT

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CONTROLLER AREA NETWORK (CAN)

54C-6

TEST EQUIPMENT

M1548304300258

MB991223

a. MB991219
b. MB991220
c. MB991221
d. MB991222

Harness set

a. Test harness
b. LED harness
c. LED harness 

adaptor

d. Probe

General service tools Continuity check and voltage 

measurement at harness wire or 
connector for loose, corroded or 
damaged terminals, or terminals 
pushed back in the connector.

a. Connector pin contact 

pressure inspection

b. Power circuit inspection
c. Power circuit inspection
d. Commercial tester connection

MB992006
Extra fine probe

−

Continuity check and voltage 
measurement at harness wire or 
connector for loose, corroded or 
damaged terminals, or terminals 
pushed back in the connector.

MB992110
Power plant ECU 
check harness

−

Measure the voltage and 
resistance at the engine control 
module (ECM)

MB991997
ASC check harness

−

Measure the voltage and 
resistance at the ASC-ECU

Tool

Tool number and 
name

Supersession

Application

MB991223

a

d

c

b

DO NOT USE

BA

MB992006

MB992110

MB991997

Test equipment

Name

Use

Digital multimeter

Checking CAN bus circuit (for resistance and voltage 
measurements)

AC000019