Network management is an essential foundational function in modern automobiles. With the rise of intelligent connected vehicles, the increasing number of Electronic Control Units has led to higher demands and complexities in in-vehicle network systems. To ensure the security and stability of network management, comprehensive testing solutions are required. This study proposes a testing method specifically for AUTOSAR CAN network management, based on a deep understanding of the AUTOSAR CAN network management specification. Firstly, a testing system is constructed using the standard TTCN-3 scripts provided by AUTOSAR. The system is designed to generate variable-length test messages and conduct multi-scenario testing of CAN network management. Secondly, a new syntax format is defined based on the Backus-Naur Form to impose time constraints on TTCN-3, thereby enhancing the accuracy of monitoring CAN network messages. Using this method, three abnormal messages were identified in practical tests on the MPC5745B platform, enabling the evaluation of the security and stability of AUTOSAR CAN network management. Experimental results demonstrate that this method enables comprehensive testing of the consistency of AUTOSAR CAN network management while conserving testing software and hardware resources.