General Information: Structure

WARNING: This page is about a different car, the 2008 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Controller Area Network (CAN) Structure Diagram

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

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.
The CAN bus line consists of two lines, CAN_L and CAN_H (CAN Low and CAN High, respectively), 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 incorporated in ECU. Resistors with approximately 120 ohms is used for the dominant ECU, and that with 3.0 kOhms is used for the non-dominant ECU.

NOTE:

Dominant ECU: ETACS-ECU and engine control 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 network.

CAN-B

A/C-ECU
SRS-ECU
Occupant classification-ECU
Hands free module < vehicles with hands-free cellular phone system>
Radio and CD player or Radio and CD changer < vehicles without Mitsubishi Multi-Communication System (MMCS)>
CAN box unit < vehicles with Mitsubishi Multi-Communication System (MMCS)>
Satellite radio tuner < vehicles with satellite radio>
Wireless control module (WCM) < vehicles without KOS>
KOS-ECU < vehicles with KOS>
Combination meter

CAN-C

AWD-ECU <4WD>
Steering wheel sensor < vehicles with ASC>
ABS-ECU < vehicles without ASC>
ASC-ECU < vehicles with ASC>
Transaxle control module (TCM)
Engine control module (ECM)

DIAGNOSIS CAN-C

Data link connector