The error variance detection method of can communication system and the can communication system

The present invention relates to a method of detecting an error variance of the can and the can a communication system a communication system. In the error dispersion detection method of the CAN communication system according to an embodiment of the invention, the CAN communication when a communication error occurs in the system, the error information at least one of the slave ECU is corresponding to the communication error, the network management start message storing the, at least one of the plurality of slave ECU in response to a step, wherein the master ECU is started said network management transfer message for transmitting the network management start message to the master ECU for determining the presence of said error information step, in the case in which the error information is present comprises the step of the master ECU that step and the master ECU detects the error information from the network management start message is sent to the detected error information at the request of the diagnosis to the diagnosis device do. According to the present invention as described above, there is an effect that can be used as it starts the network management message used in the vehicle ECU to determine the disconnection or short circuit failure of the can or communication line of a controller included in the ECU.