Precautions On How To Repair The Can Bus Lines

Fig 1: Identifying Added Wire (No Good)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

If the CAN_L or CAN_H line on the main bus line or branch line is repaired, renew 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 2: Identifying Twisted Wires Distance
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
If the connector or wire on the main bus line or the branch wire is replaced, the frayed end of the twisted wire should be within 10 cm (4.0 inches) from the connector. If it exceeds 10 cm (4.0 inches), twist the wiring harness just like the original twisted wire. If the frayed end exceeds 10 cm (4.0 inches), noise suppression is deteriorated, causing a communication error.

Fig 3: Identifying Splice Locations At Main Bus Line & Branch Line
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
If a branch wire is repaired, splice a new wire directly into the main bus line. If a new wire is spliced into the branch line, which is connected to another device, a CAN communication error will be caused.