本文件规定诊断协议数据单元应用程序编程接口（D？PDU？API）为模块化车辆通信接口（MVCI）协议模块软件接口，是诊断和重新编程软件应用程序的通用基础。 本文档介绍了应用程序编程接口（API）功能和诊断协议的抽象，以及MVCI协议模块功能的处理和描述。本文档附带MVCI模块描述文件示例。 本文件的目的是确保任何车辆或工具制造商的诊断和重新编程应用程序可以在通用软件接口上运行，并可以轻松交换MVCI协议模块实现。

This document specifies the diagnostic protocol data unit application programming interface (D？PDU？API) as a modular vehicle communication interface (MVCI) protocol module software interface and common basis for diagnostic and reprogramming software applications. This document covers the descriptions of the application programming interface (API) functions and the abstraction of diagnostic protocols, as well as the handling and description of MVCI protocol module features. Sample MVCI module description files accompany this document. The purpose of this document is to ensure that diagnostic and reprogramming applications from any vehicle or tool manufacturer can operate on a common software interface and can easily exchange MVCI protocol module implementations.