规定了在道路车辆的车载电子控制单元（ECU）和合适的诊断测试仪之间建立数字信息交换的要求。建立这种通信是为了方便车辆、系统和ECU的检查、测试诊断和调整。当使用特定于系统的诊断测试设备时，不适用。

Specifies the requirements for setting up the interchange of digital information between on-board Electronic Control Units (ECUs) of road vehicles and suitable diagnostic testers. This communication is established in order to facilitate inspection, test diagnosis and adjustment of vehicles, systems and ECUs. Does not apply when system-specific diagnostic test equipment is used.