Precautions On How To Repair The Can Bus Lines

If the CAN_L or CAN_H line on the main bus line or sub-bus line is repaired, replace all the twisted wires between the end connectors. If the wiring harness is partially repaired, or only CAN_L or CAN_H line is repaired, noise suppression is deteriorated, causing a communication error.

Fig 1: Precautions For Added Wires Between End Connectors
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
If the connector or wire on the main bus line or the sub-bus wire is replaced, the strand end of the twisted wire should be within 10 cm (4.0 inches) from the connector. If it exceeds 10 cm (4 inches), twist the wiring harness just like the original twisted wire. If the strand end exceeds 10 cm (4 inches), noise suppression is deteriorated, causing a communication error.

Fig 2: Twisted Wire Dimension From Connector
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
If a sub-bus line is repaired, splice a new wire directly into the main bus line. If a new wire is spliced into the sub-bus line, which is connected to another device, the CAN communication will be disabled.

Fig 3: Proper And Improper Bus Line
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.