circuit employing the CAN protocol connects each
electric control module (ECU), and sensor data can
be shared among, which enables more reduction in
wiring.
NOTE:

: The regulations have been decided in

detail, from software matters such as the necessary
transmission rate for communication, the system,
data format, and communication timing control
method to hardware matters such as the harness
type and length and the resistance values.

CAN offers the following advantages.

• Transmission rates are much faster than those in

conventional communication (up to 1 Mbps),
allowing much more data to be sent.

• It is exceptionally immune to noise, and the data

obtained from each error detection device is more
reliable.

• Each ECU connected via the CAN communicates

independently, therefore if the ECU enters dam-
aged mode, communications can be continued in
some cases.

GENERAL INFORMATION

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CONTROLLER AREA NETWORK (CAN)

54C-3

STRUCTURE

• With OUTLANDER, for the first time with MMC, 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.

ACA02827 AB

Engine control
module (ECM)

AWD-ECU

SRS-ECU

A/C-ECU

Satellite
radio tuner

Combination
meter

Radio and
CD player*
or
Radio and
CD changer*
or
CAN box unit*

WCM*
or
KOS-ECU*

Scan tool

Data link
connector

ETACS-ECU

Steering
wheel
sensor

ABS-ECU*
or
ASC-ECU*

Transaxle
control
module
(TCM)

CAN_H

CAN_L

Main bus line

CAN_H

CAN_L

CAN_H

CAN_L

CAN-C

CAN-B

Diagnosis CAN-C

Terminal resistor

Terminal
resistor

: indicates main bus line

: indicates sub bus line

Occupant
classification-
ECU

Main bus line

NOTE:
*: ABS-ECU <Vehicles without ASC>
ASC-ECU <Vehicles with ASC>
AWC-ECU <Vehicles with S-AWC>
WCM <Vehicles without KOS>
KOS-ECU <Vehicles with KOS>
Radio and CD Player
<Vehicles with radio and CD player>
Radio and CD changer
<Vehicles with radio and CD changer>
CAN box unit <Vehicles with MMCS>

<CVT, A/T>

<4WD>

AWC-ECU*

GENERAL INFORMATION

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-4

• 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 k

Ω is used for the non-dominant ECU.

NOTE:

•

Dominant ECU: ETACS-ECU and engine con-
trol module

•

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

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

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

• A/C-ECU

• SRS-ECU

• Occupant classification-ECU

• Radio and CD player <vehicles with radio and

CD player>

• Radio and CD changer <vehicles with radio

and CD changer>

• CAN box unit <vehicles with MMCS>

• Satellite radio tuner <vehicles with satellite

radio>

• WCM <vehicles without KOS>

• KOS-ECU <vehicles with KOS>

• Combination meter

CAN-C

• AWD-ECU <Electric controlled AWD>

• AWC-ECU <S-AWC>

• Steering wheel sensor <vehicles with ASC>

• ABS-ECU <vehicles without ASC>

• ASC-ECU <vehicles with ASC>

• Transaxle control module (TCM) <CVT, A/T>

• Engine control module (ECM)

DIAGNOSIS CAN-C

• Data link connector

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