CAN-BUS Instrument Cluster To Data BUS OBD Interface, Checking: Function

the Engine Control Module (ECM) -J623- communicates with other CAN-Bus capable control modules.

the control modules are connected by two data bus wires which are twisted together (CAN_High and CAN_Low), and exchange information (messages). Missing information on the CAN-bus is recognized as a malfunction by the Engine Control Module (ECM) -J623- and the other control modules connected to the CAN-bus.

Trouble-free operation of the CAN-Bus requires that it have a terminal resistance. This central terminal resistance is located in the Engine Control Module (ECM) -J623-.