Abstract: There is provided a communication failure detection device configured to detect a communication failure of a two-wire CAN communication device that makes communication between nodes according to a CAN protocol. Each of the nodes is provided with two signal detection circuits configured to detect signals on the two communication lines. Each node makes communication for failure dentification to output signals of predetermined patterns onto the two communication lines when an execution condition is satisfied in response to the occurrence of a protocol error of CAN communication. Each node then performs failure identification to identify the type of a failure based on a combination of the signals respectively detected by the two signal detection circuits during the communication for failure identification.

Abstract: There is provided a communication failure detection device configured to detect a communication failure of a two-wire CAN communication device that makes communication between nodes according to a CAN protocol. Each of the nodes is provided with two signal detection circuits configured to detect signals on the two communication lines. Each node makes communication for failure dentification to output signals of predetermined patterns onto the two communication lines when an execution condition is satisfied in response to the occurrence of a protocol error of CAN communication. Each node then performs failure identification to identify the type of a failure based on a combination of the signals respectively detected by the two signal detection circuits during the communication for failure identification.