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SAE J1979-2

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Introduction SAE J1979-2 describes the communication between the vehicle’s OBD systems and test equipment required by OBD regulations. OBD regulations require passenger cars and light-, medium-, and heavy-duty trucks to support a minimum set of diagnostic information to external (off-board) “generic” test equipment. To achieve this, SAE J1979-2 is based on the Open Systems Interconnection (OSI) Basic Reference Model in accordance with ISO/IEC 7498-1 and ISO/IEC 10731, which structures communication systems into seven layers. When mapped on this model, the services specified are broken into: • Diagnostic services (layer 7), specified in: ○ ISO 14229-1 ○ SAE J1979-2 OBDonUDS • Presentation layer (layer 6), specified in: ○ SAE J1930, SAE J1930DA ○ SAE J1979DA ○ SAE J2012, SAE J2012DA ○ SAE J1939DA, SAE J1939-73 • Session layer services (layer 5), specified in: ○ ISO 14229-2 • Transport layer services (layer 4), specified in: ○ DoCAN: ISO 15765-2 Transport protocol and network layer services ○ ISO 15765-4 Requirements for emissions related systems ○ DoIP: ISO 13400-2 Road vehicles - Diagnostic communication over Internet Protocol (DoIP) - Part 2: Transport protocol and network layer services • Network layer services (layer 3), specified in: ○ DoCAN: ISO 15765-2 Transport protocol and network layer services ○ ISO 15765-4 Requirements for emissions related systems ○ DoIP: ISO 13400-2 Road vehicles - Diagnostic communication over Internet Protocol (DoIP) - Part 2: Transport protocol and network layer services • Data link layer (layer 2), specified in: ○ DoCAN: ISO 15765-4, ISO 11898-1, ISO 11898-2 ○ DoIP: ISO 13400-3 Road vehicles - Diagnostic communication over Internet Protocol (DoIP) - Part 3: Wired vehicle interface based on IEEE 802.3 • Physical layer (layer 1), specified in: ○ DoCAN: ISO 15765-4, ISO 11898-1, ISO 11898-2. ○ DoIP: ISO 13400-3 Road vehicles - Diagnostic communication over Internet Protocol (DoIP) - Part 3: Wired vehicle interface based on IEEE 802.3 NOTE: SAE J1979-2 provides a STANDARD to satisfy known country-specific OBD regulations. SAE J1979-2 is not considered a final authority for interpretation of the OBD regulations, so users of this document should determine the applicability of capabilities defined in this document for their specific OBD regulatory requirements. SAE Document Reference Concept SAE J1979-2 references several SAE documents that contain all terms, data, and diagnostic trouble code (DTC) definitions. SAE J1979DA (Digital Annex) This document references SAE J1979DA. SAE J1979DA is concerned with the definition of: • DataIdentifiers (DID) • ReadinessGroupIdentifiers (RGID) • ExtendedDataRecords (EDR) • Routine Identifiers (RID) • Unit and Scaling Identifiers (UASID) • Info Types (ITID) SAE Digital Annex Revision Procedure New emissions-related regulatory requirements drive new in-vehicle technology to lower emissions. New technology-related OBD monitor data and diagnostic trouble codes need to be standardized to support the external (off-board) “generic” test equipment. All relevant information is proposed by the automotive industry represented by members of the appropriate SAE task force. SAE J1979-2 references a “Change Request Form” to be used for new data items to be defined by the SAE task force for standardization. The standardized data items will be defined in SAE J1979DA. Once the information has been balloted and approved, the documents will be published on the SAE Store website. The revision request form for SAE J1979-2 can be obtained on the Registration Authority’s website. Fill out the “SAE_J1979DA_Revision_Request_Form.doc” with your request and send an email with completed revision request form as attachment to email: SAEj1979@SAE.org. Those users who use SAE_J1939-73_DTCFormat to communicate DTCs may also request new Suspect Parameter Number (SPN) values from the SAE Truck and Bus Control and Communications Network Committee. Instructions and request forms are available to the public on the committee’s SAE Standards Works website. The index of SPN assignments is published quarterly in SAE J1939DA. SAE J1939DA includes all the SPN labels defined in SAE J2403 and SAE J2403DA. SAE J1939DA also defines a range of manufacturer proprietary SPNs that are occasionally used for diagnostic conditions that do not map unambiguously into the standardized list of SPNs. Document Scope This document is intended to satisfy the data reporting requirements of OBD regulations in the United States, Europe, and any other market 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. At the time of publication, many regional regulations are not yet final 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. SAE J1979-2 specifies diagnostic services and both functionally addressed and physically addressed request/response messages required to be supported by motor vehicles and external test equipment for diagnostic purposes that pertain to motor vehicle emission-related data. Any external test equipment meeting the requirements of SAE J1978 is intended to be able to use these messages to retrieve emissions-related information from the vehicle. The structure of this document is based on the structure of SAE J1979 for the convenience of users familiar with SAE J1979. Each section of this part of SAE J1979-2, which specifies additional detail to existing sections of ISO 15765-4 and SAE J1979, supersedes those specifications for their use under the scope of SAE J1979-2. This part of SAE J1979-2 references SAE J1979DA (Digital Annex), which includes all definitions of DIDs.

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