Lancer Sportback L4-2.4L (4B12) (2010)
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3. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the figure.
OK: The display of the scan tool MB991958 is as shown in the figure.
Q: Does scan tool MB991958 screen correspond to the illustration?
YES : The trouble can be an intermittent malfunction (Refer to How to use Troubleshooting/inspection Service Points - How to Cope with
Intermittent Malfunction).
NO : Check the ETACS-ECU connector C-301, and repair if necessary. If the ETACS-ECU connector is in good condition, replace the
ETACS-ECU.
Precautions On How To Repair The CAN Bus Lines
PRECAUTIONS ON HOW TO REPAIR THE CAN BUS LINES
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If the CAN bus line(s) are 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.
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If the connector or wire on the main bus line or the sub-bus wire is replaced, the frayed end of the twisted wire should be within 10 cm (4 inches)
from the connector. If it exceeds 10 cm (4 inches), twist the wiring harness just like the original twisted wire. If the frayed end exceeds 10 cm (4
inches), noise suppression is deteriorated, causing a communication error.
