本SAE推荐实施规程的目的是验证车辆和/或部件是否能够传达SAE J1939-73中规定的诊断消息所描述的一组所需信息，该信息符合以下引用的政府法规中包含的非车载诊断工具接口要求，以及用于验证从非车载诊断工具（即扫描工具）到车辆和/或部件的诊断通信的结果。 SAE成员编制了本文件，作为测试车辆是否符合ARB和其他要求的指南，这些要求适用于中型和重型车辆中使用的重型发动机的排放相关车载诊断（OBD）功能。美国环保局和加利福尼亚州空气资源委员会（ARB）制定的HD OBD法规要求执行诊断消息服务评估生产车辆的诊断通信标准化要求。用户应参考SAE J1939提供的摘要- 73表1和表2用于OBD合规性支持，以及SAE J1939-73附录H中关于附加实施概念的讨论。

The purpose of this SAE Recommended Practice is to verify that vehicles and/or components are capable of communicating a required set of information, which is described by the diagnostic messages specified in SAE J1939-73, that is in accordance with off-board diagnostic tool interface requirements contained in the government regulations cited below.This document describes the tests, methods, and results for verifying diagnostic communications from an off-board diagnostic tool (i.e., scan tool) to a vehicle and/or component. SAE members have generated this document to serve as a guide for testing vehicles for compliance with ARB and other requirements for emissions-related on-board diagnostic (OBD) functions for heavy-duty engines used in medium- and heavy-duty vehicles.The development of HD OBD regulations by U.S. EPA and California’s Air Resources Board (ARB) require that diagnostic message services are exercised to evaluate diagnostic communication standardization requirements on production vehicles. The user should reference the summary provided by SAE J1939-73Tables 1and2for OBD compliance support, and the discussion in SAE J1939-73 Appendix H for additional implementation concepts.