此为汽车电子行业相关的CAN诊断协议的标准化文件，得来不易，对CAN诊断开发人员特别有用。-This is the auto electronics industry related to the standardization of CAN diagnosis protocol document, is not easy to diagnose on the CAN particularly useful to developers.

包括了iso14230和saej1979，iso14230规定了OBD2系统的物理层以及数据链路层，saej1979是应用层的协议-Includes iso14230 and saej1979, iso14230 provides OBD2 system, as well as the physical layer data link layer, saej1979 is the application layer protocol