道路车辆 统一诊断服务（UDS） 应用层

[中文适用范围]： 1 范围 本标准规定了诊断通信服务在数据链路层上的通用要求。通过这些服务，诊断测试仪（客户端）可控制车载电子控制单元（ECU，服务器）中的各类诊断功能，例如电子燃油喷射系统、自动变速箱、防抱死制动系统等，这些 ECU 均通过嵌入于道路车辆中的串行数据链路相连。 本标准所规定的诊断通信服务，使诊断测试仪（客户端）能够实现以下功能：停止或恢复非诊断消息的传输、读取车辆识别信息、获取实时传感器数据、读取并清除诊断信息、控制执行机构、启动/停止例行程序等，从而协助对车辆电子系统进行诊断。 本标准不适用于车辆通信数据链路上两个电子控制单元之间传输的非诊断消息。本标准不限制在车载电子控制单元内部实现板载诊断测试仪（客户端）的方案，即允许利用上述通信服务在车辆通信数据链路上进行双向诊断数据交换。此外，本标准不涉及任何具体实现要求。 [外文原描述]： This document specifies data link independent requirements of diagnostic communication services. These allow a diagnostic tester (client) to control diagnostic functions in an in-vehicle electronic control unit (ECU, server) such as an electronic fuel injection, automatic gearbox, anti-lock braking system, etc. connected to a serial data link embedded in a road vehicle. This document specifies diagnostic communication services, which allow the diagnostic tester (client) to stop or to resume non-diagnostic message transmission, to read vehicle identification data and real-time sensor data, read and clear diagnostic information, control actuators, start/stop routines, and many more functions to assist in diagnosing the vehicle's electronic systems. This document does not apply to non-diagnostic message transmission on the vehicle's communication data link between two electronic control units. This document does not restrict an in-vehicle on-board tester (client) implementation in an ECU/server in order to utilize the diagnostic communication services on the vehicle's communication data link to perform bidirectional diagnostic data exchange. This document does not specify any implementation requirements.