J1978_200204 OBD II Scan Tool — Equivalent to ISO/DIS 15031-4:December 14, 2001

Revised

04/30/2002

Features
Issuing Committee
Scope
Content
This SAE Recommended Practice supersedes SAE J1978 FEB1998, and is technically equivalent to 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-Board Diagnostic (OBD) regulations.
The document specifies:
  1. a
    A means of establishing communications between an OBD-equipped vehicle and external test equipment,
  2. b
    A set of diagnostic services to be provided by the external test equipment in order to exercise the services defined in SAE J1979,
  3. c
    Conformance criteria for the external test equipment.
Rationale
Content
ISO 15031-4 was created to be referenced in OBD regulations outside of the United States, and contains the same technical content as the previous version of SAE J1978 with the following additions:
  1. a
    Provisions for ISO 15765-4 (CAN) as a diagnostic serial data link (only 500 Kbps is allowed in U.S. regulations).
  2. b
    Allowance for 24 V DC connector as defined in ISO 15031-3 (not allowed in U.S. regulations)..
This document was issued to include the same technical content, in the same order, and with the same section references as the ISO document, but includes exceptions required by proposed U.S. regulations.
NOTE— To maintain equivalency of the documents, a comma is used as a decimal marker for numeric values in this document.
Meta TagsDetails
DOI
https://doi.org/10.4271/J1978_200204
Pages
11
Citation
SAE International Recommended Practice, OBD II Scan Tool — Equivalent to ISO/DIS 15031-4:December 14, 2001, SAE Standard J1978_200204, Revised April 2002, Issued March 1992, https://doi.org/10.4271/J1978_200204.
Additional Details
Publisher
Published
Apr 30, 2002
Product Code
J1978_200204
Content Type
Recommended Practice
Status
Revised
Language
English