This document supersedes SAE J1979 Apr 2002, and is technically equivalent to ISO 15031-5:2006, with the addition of new capabilities required by revised regulations from the California Air Resources Board (see Section 1.2). This document is intended to satisfy the data reporting requirements of On-Board Diagnostic (OBD) regulations in the United States and Europe, and any other region that may adopt similar requirements in the future. This document specifies: a. message formats for request and response messages, b. timing requirements between request messages from external test equipment and response messages from vehicles, and between those messages and subsequent request messages, c. behavior of both the vehicle and external test equipment if data is not available, d. a set of diagnostic services, with corresponding content of request and response messages, to satisfy OBD regulations, This document includes capabilities required to satisfy OBD requirements for multiple regions, model years, engine types, and vehicle types. Those regulations are not yet final for some regions, and are expected to change in the future. This document makes no attempt to interpret the regulations and does not include applicability of the included diagnostic services and data parameters for various vehicle applications. The user of this document is responsible to verify the applicability of each section of this document for a specific vehicle, engine, model year and region. This document is based on the Open Systems Interconnection (OSI) Basic Reference Model in accordance with ISO/IEC 7498 and ISO/IEC 10731 which structures communication systems into seven layers as shown in the table below. Table 1 - Applicability and relationship between documents Applicability OSI 7 layer Emissions-related diagnostics Physical (layer 1) ISO 9141-2 ISO 14230-1 SAE J1850 ISO 11898, ISO 15765-4 Seven layer according to Data link (layer 2) ISO 9141-2 ISO 14230-2 SAE J1850 ISO 11898, ISO 15765-4 ISO/IEC 7498 and Network (layer 3) --- --- --- ISO 15765-2, ISO 15765-4 ISO/IEC 10731 Transport (layer 4) --- --- --- --- Session (layer 5) --- --- --- ISO 15765-4 Presentation (layer 6) --- --- --- --- Application (layer 7) SAE J1979 / ISO 15031-5 SAE J1979 / ISO 15031-5 SAE J1979 / ISO 15031-5 SAE J1979 / ISO 15031-5
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The prior version of SAE J1979 was technically equivalent tp a draft version of ISO 15031-5. The ISO document was subsequently edited and published as an International Standard, including minor editorial changes. This version of SAE J1979 includes all of the editorail changes that were included in the published version of the ISO document. In addition, this document also includes new requirements from the California Air Resources Board for the 2010 model year, including diesel engine vehicles.