Open in One Side of CAN Sub Bus Line

Open in One Side of CAN Sub Bus Line

DESCRIPTION




If 2 or more ECUs and/or sensors do not appear on the intelligent tester "BUS CHECK" screen via the CAN VIM, one side of the CAN sub-bus lines may be open. (one side of the CAN-H [sub-bus line] / CANL [sub-bus line] of the ECU and/or sensor is open.)

Wiring Diagram:

Step 1:

Step 2:

INSPECTION PROCEDURE

NOTE:
- Turn the ignition switch off before measuring the resistance of the CAN main wires and CAN branch wires.
- After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
- Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:
- Operating the ignition switch, any other switches, or any doors triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
- Perform the following inspections for the ECUs (sensors) that are not displayed on the intelligent tester first. If a malfunction is still not able to be identified, perform the following inspections for all other ECUs (sensors) connected to the CAN communication system.
- The basic inspection procedures that can be used for all related ECUs in common are shown. "ECU A" represents the following: ECM, steering sensor, yaw rate sensor, skid control ECU, combination meter ECU.