SAE J1978-1_202312
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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OBD-II Scan Tool: First Generation Protocols
Hardcopy , PDF
English
13-12-2023
20-04-2026
SAE J1978-1 specifies a complementary set of functions to be provided by an OBD-II scan tool.
| DocumentType |
Standard
|
| Pages |
37
|
| ProductNote |
This standard also refers to SAE J1978-2
|
| PublisherName |
SAE International
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
SAE J1978-1 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 complies to SAE J1978-1The SAE J1978-1 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.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 and SAE J1979-2.The presentation of the SAE J1978 document family, where SAE J1978-1 covers first generation protocol functionality defined in SAE J1979, and SAE J1978-2 covers second generation protocol functionality defined in SAE J1979-2.The SAE J1978 document family 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 J1978-1 requirements are highlighted by bold italic text in the technical requirements sections of this document.
| ISO 14230-2:2016 | Road vehicles — Diagnostic communication over K-Line (DoK-Line) — Part 2: Data link layer |
| ISO 13400-2:2019 | Road vehicles — Diagnostic communication over Internet Protocol (DoIP) — Part 2: Transport protocol and network layer services |
| ISO 13400-4:2016 | Road vehicles — Diagnostic communication over Internet Protocol (DoIP) — Part 4: Ethernet-based high-speed data link connector |
| ISO 15031-1:2010 | Road vehicles — Communication between vehicle and external equipment for emissions-related diagnostics — Part 1: General information and use case definition |
| ISO 15031-4:2014 | Road vehicles — Communication between vehicle and external equipment for emissions-related diagnostics — Part 4: External test equipment |
| ISO 15765-4:2021 | Road vehicles — Diagnostic communication over Controller Area Network (DoCAN) — Part 4: Requirements for emissions-related systems |
| ISO 15031-2:2010 | Road vehicles — Communication between vehicle and external equipment for emissions-related diagnostics — Part 2: Guidance on terms, definitions, abbreviations and acronyms |
| ISO 15031-5:2015 | Road vehicles — Communication between vehicle and external equipment for emissions-related diagnostics — Part 5: Emissions-related diagnostic services |
| ISO 14230-4:2000 | Road vehicles — Diagnostic systems — Keyword Protocol 2000 — Part 4: Requirements for emission-related systems |
| ISO 13400-3:2016 | Road vehicles — Diagnostic communication over Internet Protocol (DoIP) — Part 3: Wired vehicle interface based on IEEE 802.3 |
| ISO 15031-6:2015 | Road vehicles — Communication between vehicle and external equipment for emissions-related diagnostics — Part 6: Diagnostic trouble code definitions |
| ISO 15031-3:2023 | Road vehicles — Communication between vehicle and external equipment for emissions-related diagnostics — Part 3: Diagnostic connector and related electrical circuits: Specification and use |
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