On-Board Diagnostic (OBD) regulations require passenger cars, and light and medium duty trucks, to support communication of a minimum set of diagnostic information to off-board "generic" test equipment. This document specifies the diagnostic data which may be required to be supported by motor vehicles and external test equipment for diagnostic purposes which pertain to motor vehicle emission-related data. SAE J1979 was originally developed to meet U.S. OBD requirements for 1996 and later model year vehicles. ISO 15031 5 was based on SAE J1979 and was intended to combine the U.S. requirements with European OBD requirements for 2000 and later model year vehicles.Updated to include new and revised data identifiers, primarily ZEV-related from CARB Advanced Clean Cars II rulemaking.
On-Board Diagnostic (OBD) regulations require passenger cars, and light and medium duty trucks, to supportcommunication of a minimum set of diagnostic information to off-board "generic" test equipment. This document specifiesthe diagnostic data which may be required to be supported by motor vehicles and external test equipment for diagnosticpurposes which pertain to motor vehicle emission-related data.SAE J1979 was originally developed to meet U.S. OBD requirements for 1996 and later model year vehicles. ISO15031-5 was based on SAE J1979 and was intended to combine the U.S. requirements with European OBDrequirements for 2000 and later model year vehicles.This document has been issued to make available the initial version of J1979-DA. This Digital Annex contains exactly thesame data as Appendices A through G of the J1979 document which was published September 2010. The intent is toeventually provide this document as an excel document with more frequent updates than the base J1979 document.J1979-DA is referenced by both SAE and ISO standards.
SAE J1979 / ISO 15031-5 set includes the communication between the vehicle's OBD systems and test equipment implemented across vehicles within the scope of the legislated emissions-related OBD.To achieve this, it 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 15031-5/SAE J1979 (emissions-related OBD), ISO 27145-3 (WWH-OBD), Presentation layer (layer 6), specified in: ISO 15031-2, SAE J1930-DA, ISO 15031-5, SAE J1979-DA, ISO 15031-6, SAE J2012-DA, ISO 27145-2, SAE J2012-DA, Session layer services (layer 5), specified in: ISO 14229-2 supports ISO 15765-4 DoCAN and ISO 14230-4 DoK-Line protocols, ISO 14229-2 is not applicable to the SAE J1850 and ISO 9141-2 protocols, Transport layer services (layer 4), specified in: DoCAN: ISO 15765-2 Transport protocol and network layer services, SAE J1850: ISO 15031-5/SAE J1979 Emissions-related diagnostic services, ISO 9141-2: ISO 15031-5/SAE J1979 Emissions-related diagnostic services, DoK-Line: ISO 14230-4, ISO 15031-5/SAE J1979 Emissions-related diagnostic services, Network layer services (layer 3), specified in: DoCAN: ISO 15765-2 Transport protocol and network layer services, SAE J1850: ISO 15031-5/SAE J1979 Emissions-related diagnostic services, ISO 9141-2: ISO 15031-5/SAE J1979 Emissions-related diagnostic services, DoK-Line: ISO 14230-4, ISO 15031-5/SAE J1979 Emissions-related diagnostic services, Data link layer (layer 2), specified in: DoCAN: ISO 15765-4, ISO 11898-1, -2, SAE J1850, ISO 9141-2, DoK-Line: ISO 14230-2, Physical layer (layer 1), specified in: DoCAN: ISO 15765-4, ISO 11898-1, -2, SAE J1850, ISO 9141-2, DoK-Line: ISO 14230-1,in accordance with Table 1 SAE document reference conceptISO 15031 references several SAE documents which contain all terms, data and DTC definitions.See Figure 1 - SAE Digital Annex document reference with the following definition of content in ISO 15031 parts: SAE J1930: the document is concerned with a procedure for naming objects and systems and with the set of words from which names are built. It references SAE J1930-DA which contains all standardized naming objects, terms and abbreviations. SAE J1979: the document is concerned with the definition of emissions-related diagnostic services (diagnostic test modes). It references SAE J1979-DA which contains all standardized data items like PIDs, Test Ids, Monitor IDs and InfoType IDs. SAE J2012: the document is concerned with the procedure for defining emissions-related diagnostic trouble codes. It references SAE J2012-DA which contains all standardized data items like DTCs and FTBs. On-Board Diagnostic (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.SAE J1979-DA (Digital Annex)This part of ISO 15031 references the SAE J1979-DA. The SAE J1979-DA is concerned with the definition of: Parameter Identifiers (PIDs), Test Identifiers (TIDs), OBD Monitor Identifiers (OBDMIDs), Unit and Scaling Identifiers (UASIDs), and Info Types (INFOTYPEs);SAE Digital Annex revision procedureNew 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.ISO 15031-5/SAE J1979 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 the SAE J1979-DA. Once the information has been balloted and approved, the documents will be published on the SAE Store Web Site.The revision request form and instructions for updating ISO 15031 Part 5 / SAE J1979 can be obtained on the Registration Authority's web site at:http://www.sae.org/servlets/works/committeeHome.do?comtID=TEVDS14The column titled "Resources" shows a document with the title: J1979-DA_Revision_Request_Form.doc. Double click on the name and you will be asked to download the document with the filename:SAE_J1979-DA_Revision_Request_Form.docFill out the revision request form with your request.Please send e-mail with completed revision request form as attachment to: SAE Automotive Headquarters755 West Big Beaver RoadSuite 1600Troy, MI 48084-4093, USAFax: +1 (248) 273-2494Email: [email protected] SAE J1979 is being republished with no appendices to complement the J1979DA document that is now avalailable. No other changes have been made since the last publication. The rationale from the previous publication has been retained below for reference.Changes have been made to this document in order to keep pace with changes made to the California Air Resources Board legislation: Title 13, California Code Regulations, Section 1968.2, Malfunction and Diagnostic System Requirements for 2004 and Subsequent Model-Year Passenger Cars, Light-Duty Trucks, and Medium-Duty Vehicles and Engines (OBD II), and Regulation (EC) No 715/2007 of the European Parliament and of the Council of June 20, 2007 on type approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information as amended by Commission Regulation (EC) 692/2008.Some clarifications and functional enhancements have also been included in this document.
This SAE Recommended Practice describes the implementation of Enhanced Diagnostic Test Modes, which are intended to supplement the legislated Diagnostic Test Modes defined in SAE J1979. Modes are defined for access to emission related test data beyond what is included in SAE J1979, and for non-emission related data. This document describes the data byte values for diagnostic messages transmitted between diagnostic test equipment, either on-vehicle or off-vehicle, and vehicle electronic control modules. No distinction is made between test modes for emission related and non-emission related diagnostics. These messages can be used with a diagnostic serial data link such as described in SAE J1850 or ISO 9141-2.For each test mode, this document includes a functional description of the test mode, request and report message data byte content, and an example if useful for clarification. J2190 is being canceled as it is very old document and has very little current use. This has not been superseded by any later SAE documents, but has been superseded by some ISO documents, which at a very high level include information that was in SAE J2190, but go into considerably more detail. ISO 14230-3: 1999 is intended for ISO 14230 (ISO 9141 based) serial data links, ISO 15765-3:2004 is intended for ISO 15765 (CAN) data links, and ISO 14229-1:2006 is "Unified Diagnostic Services" intended for all current and future serial data links.
SAE J1979-2 describes the communication between the vehicle's OBD systems and test equipment required by OBD regulations. On-Board Diagnostic (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 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, -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, -2, in accordance with Table 1 DoIP: ISO 13400-3 Road vehicles - Diagnostic communication over Internet Protocol (DoIP) - Part 3: Wired vehicle interface based on IEEE 802.3 Due to regulatory adoption of OBDonUDS, SAE J1979 now becomes a multiple part document series: 1SAE J1979, which defines diagnostic test modes for legacy data links used for emissions OBD (e.g., SAE J1850, ISO 9141-2, ISO 14230-4, ISO 15765-4). 2SAE J1979-2, which defines the latest diagnostic services for OBDonUDS used for emissions OBD (e.g., ISO 14229-1).Market regulations specify which data links are allowed for sale in a given market.OBDonUDS is not just a translation of the classic SAE J1979 $01-$0A services to UDS servicesit provides extra features: DTC based Readiness, ExtendedDataRecords for DTCs, Readiness group to DTC readiness translation, and support for snapshots for up to five DTCs and two occurrences each. Other clarifications and functional enhancements are also included in this document.
This SAE Recommended Practice defines diagnostic test modes, and request and response messages, necessary to be supported by vehicle manufacturers and test tools to meet the requirements of the California OBD II and Federal OBD regulations, which pertain to vehicle emission-related data only. These messages are intended to be used by any service tool capable of performing the mandated diagnostics. In addition, capabilities are defined that are intended to meet other Federal and State regulations pertaining to related issues such as Inspection and Maintenance (I/M) and service information availability. This document provides the mechanism to satisfy requirements included in regulations, and not all capabilities included in this document are required by regulations. This document also is not considered a final authority for interpretation of the regulations, so the reader should determine the applicability of the capabilities defined in this document for their specific need. diagnostic Test Modes included in this document are: a. Mode $01Request current Powertrain Diagnosstic Data; Analog inputs and outputs, digital inputs and outputs, System status information, Calculated values; b. Mode $02Request Powertrain Freeze Frame Data; Analog inputs and outputs, Digital inputs and outputs, System status information, Calculated values; c. Mode $03Request Emmission-Related Powertrain Diagnostic Trouble Codes; d. Mode $04Clear/Reset Emission-Related Diagnostic Information; e. Mode $05Request Oxygen Sensor Monitoring Test Results; f. Mode $06Request On-Board Monitoring Test Results for Non-Continuously Monitored Systems; g. Mode $07Request On-Board monitoring Test Results for Continuously Monitored Systems; h. Mode $08Request Control of On-Board System, Test, or Component; i. Mode $09Request Vehicle Information. For each test mode, this specification includes: a. Functional descriptions of test mode; b. Request and response message formats. For some of the more complex test modes, an example of messages and an explanation of the interpretation of those messages is included.
Proceedings of the 11th International Conference on Human Interaction and Emerging Technologies: Artificial Intelligence & Future Applications (IHIET- AI 2024) which was held April 25-27, 2024, at the Centre Hospitalier Universitaire Vaudois (CHUV), Lausanne, Switzerland
This document supersedes SAE J1979 SEP1997, and is technically equivalent to ISO/DIS 15031-5:April 30, 2002. This SAE Recommended Practice 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. When a requirement is introduced in one region, it will later also become a requirement in another region. The ISO task force responsible for ISO 15031-5 and the SAE task force work closely together to maintain consistency in diagnostic reporting requirements in these two documents, and to ensure usability of these documents for all regions. The goal is to maintain identical technical content in the two documents, but this document may need to change if additional capabilities are required for the U.S. before the ISO document can be modified to include those changes.
This Digital Annex contains all of the information previously found within the SAE J1930 tables, including diagnostic terms applicable to electrical/electronic systems and related mechanical terms, definitions, abbreviations, and acronyms.New Acronyms, Glossary Terms, Module Names and figure have been added since last revision. The J1979 PID acronym appendix is being retired due to the creation of the J1979-DA document.
