General Information: Structure

Fig 1: Controller Area Network Structure

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

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 kilo ohms 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
- Wireless control module (WCM) < vehicles without KOS >
- KOS-ECU < vehicles with KOS >
- SRS-ECU
- Occupant classification-ECU
- A/C control panel
- Combination meter
CAN-C
- ASC-ECU
- TC-SST-ECU < TC-SST >
- Shift lever < TC-SST >
- AWC-ECU
- Steering wheel sensor
- Engine control module (ECM)
Diagnosis CAN-C
- Data link connector