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CAN Data Link

WARNING: This page is about a different car, the 2011 Audi A6, 2010 Audi A6, 2009 Audi A6, 2008 Audi A6, and 2007 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.

CAN is an acronym for Controller Area Network.

The ECM communicates with all databus capable control modules by a CAN Data Link.

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

The ECM illuminates the MIL through the CAN data link and tells the MIL to turn on, turn off, or blink.

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