SAE J1978-1_202604
Current
The latest, up-to-date edition.
OBD-II Scan Tool: First Generation Protocols
Hardcopy , PDF
English
20-04-2026
| DocumentType |
Standard
|
| Pages |
45
|
| PublisherName |
SAE International
|
| Status |
Current
|
| 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 J1979.The content of this document is intended to satisfy the requirements of an OBD-II scan tool as required by current U.S. 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. In addition, SAE J1978-1 covers first generation protocol functionality defined in SAE J1979 plus automatic protocol determination for all SAE J1979/J1979-2/J1979-3 application content.The presentation of the SAE J1978 document family, where SAE J1978-1 covers first generation protocol functionality defined in SAE J1979 and protocol determination for SAE J1979, SAE J1979-2, and SAE J1979-3, 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.
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