Controller Area Network (CAN) Data Link

Controller Area Network Data Link

"CAN" is an abbreviation for Controller Area Network.

The Engine Control Module (ECM) communicates with all databus capable control modules via a CAN Data Link.

The databus capable control modules (i.e. Engine Coolant temperature Sensor) are connected via two data bus wires which are twisted together (CAN_High and CAN_Low), and exchange information (messages) to the Engine Control Module (ECM). Missing information on the databus is then recognized and stored as a malfunction.

The Engine Control Module (ECM) illuminates the Malfunction Indicator Lamp (MIL) through the CAN data link and tells the Malfunction Indicator Lamp (MIL) to turn on, turn off, or blink.