SAE J1978-2002

标准号：SAE J1978-2002
英文标准名称：OBD II Scan Tool Equivalent to ISO/DIS 15031-4:December 14, 2001
发布日期：2002/4/1 12:00:00
实施日期：1999/12/31 12:00:00
国际标准分类号：43.040.15
引用标准：SAE J1850-2001;SAE J1930;SAE J1962;SAE J1979;SAE J2012;ISO 7637-1-1990;ISO 9141-2-1994;ISO 9141-2-1994/Amd.1-1996;ISO 14230-4-2000;ISO/DIS 15031-4-2001;ISO 15765-4-2001;ISO 16750-2;ISO 15031-1-2001
适用范围：This SAE Recommended Practice supersedes SAE J1978 FEB1998, and is technically equivalentto ISO/DIS 15031-4:December 14, 2001.This document is intended to satisfy the requirements of an OBD scan tool as required by U.S. On-BoardDiagnostic (OBD) regulations.The document specifies:a. A means of establishing communications between an OBD-equipped vehicle and external testequipment,b. A set of diagnostic services to be provided by the external test equipment in order to exercise theservices defined in SAE J1979,c. Conformance criteria for the external test equipment.1.2 Differences from ISO Document—The ISO 15031-4 document is intended to satisfy the requirements ofOBD requirements in countries other than the U.S., and includes functionality not required or not allowed in theU.S.Notable exceptions are:a. Proposed U.S. OBD regulations will allow ISO 15765-4 as an allowable OBD serial data link at500 kbps only. Only those provisions of ISO 15765-4 that pertain to 500 kbps are required to besupported by an SAE J1978 diagnostic scan tool.b. Proposed U.S. OBD regulations will not allow greater than 20 V at the SAE J1962 connector. Only theType A connector as defined in SAE J1962 needs to be supported by an SAE J1978 diagnostic scantool.Differences between the documents are highlighted in the technical requirements sections of this document.Deleted text is highlighted with and new text is highlighted with bold italic.NOTE— To maintain equivalency of the documents, a comma is used as a decimal marker for numericvalues in this document.