SAE J2534-1定义了一个标准的车辆网络接口，可用于重新编程与排放相关的控制模块。但是，需要支持2004车型年款之前的车辆以及与排放无关的控制模块。SAE J2534-2文件通过详细说明对SAE J2534-1规范API 04.04版的扩展来满足这些需求。不要求接口完全符合SAE J2534-1规范的API版本04.04，以实现本文件中规定的某些功能。这些扩展共同为通用接口提供了框架，以保护车辆原始设备制造商和故障诊断仪制造商的软件投资。本文件仅对可选功能进行描述，并以2004年12月发布的SAE J2534-1为基础。

SAE J2534-1 defines a standard vehicle network interface that can be used to reprogram emission-related control modules. However, there is a need to support vehicles prior to the 2004 model year, as well as non-emission related control modules.The SAE J2534-2 document meets these needs by detailing extensions to API version 04.04 of the SAE J2534-1 specification. It is not required for an interface to be fully compliant with API version 04.04 of the SAE J2534-1 specification to implement some of the features specified in this document. Together, these extensions provide the framework for a common interface to protect the software investment of the vehicle OEMs and scan tool manufacturers.Only the optional features will be described by this document and are based on the December 2004 publication of SAE J2534-1.