等效于ISO/DIS 15031-4-2001标准的OBD II型扫描工具

[中文适用范围]： 本 SAE 推荐做法取代了 SAE J1978 FEB1998，并且在技术上等同于 ISO/DIS 15031-4：2001 年 12 月 14 日。本文件旨在满足美国车载诊断 (OBD) 法规要求的 OBD 扫描工具的要求。该文件规定：一种在配备 OBD 的车辆和外部测试设备之间建立通信的方法，b．由外部测试设备提供的一组诊断服务，以便执行 SAE J1979,c 中定义的服务。外部测试设备的一致性标准。1.2 与 ISO 文件的差异 — ISO 15031-4 文件旨在满足美国以外国家/地区的 OBD 要求，并包括美国不需要或不允许的功能。值得注意的例外情况区域。拟议的美国 OBD 法规将允许 ISO 15765-4 作为仅 500 kbps 的允许 OBD 串行数据链路。 SAE J1978 诊断扫描工具仅需要支持 ISO 15765-4 中与 500 kbps 相关的规定。拟议的美国 OBD 法规不允许 SAE J1962 连接器上的电压超过 20 V。仅 SAE J1962 中定义的 A 型连接器需要 SAE J1978 诊断扫描工具支持。文档之间的差异在本文档的技术要求部分中突出显示。删除的文本用 突出显示，新文本用粗体斜体突出显示。注意— 为了保持文档的等效性，本文档中的数值使用逗号作为小数点标记。 [外文原描述]： SAE J1978/ISO 15031-4 specifies a complementary set of functions to be provided by an OBD-II scan tool. These functions provide complete, efficient, and safe access to all regulated OBD (on-board diagnostic) services on any vehicle which is compliant with SAE J1978/ISO 15031-4.The SAE J1978 content of this document is intended to satisfy the requirements of an OBD-II scan tool as required by current U.S. on-board diagnostic (OBD) regulations.The ISO 15031-4 content of this document is intended to satisfy the requirements of OBD requirements in countries other than the U.S., and includes functionality not required or not allowed in the U.S.This document specifies:A means of establishing communications between an OBD-equipped vehicle and an OBD-II scan tool.A set of diagnostic services to be provided by an OBD-II scan tool in order to exercise the services defined in SAE J1979/ISO 15031-5.SAE J1978/ISO 15031-4 does not preclude the inclusion of additional capabilities or functions in an OBD-II scan tool. However, it is the responsibility of the OBD-II scan tool designer to ensure that no such capability or function can adversely affect either an OBD-equipped vehicle, which may be connected to the OBD-II scan tool, or to the OBD-II scan tool itself.Differences in the SAE J1978 and ISO 15031-4 requirements are highlighted by bold italic text in the technical requirements sections of this document. Notable examples are:Current U.S. OBD regulations will permit ISO 15765-4 as an allowable OBD serial data link at 500 kbps only. Only those provisions of ISO 15765-4 that pertain to 500 kbps are required to be supported by an SAE J1978 diagnostic scan tool.Current U.S. OBD regulations will not allow greater than 20 V at the SAE J1962 connector. Only the Type A connector as defined in SAE J1962/ISO 15031-3 needs to be supported by an SAE J1978 diagnostic scan tool.Cross Reference: