{"id":683171,"date":"2024-11-06T04:44:15","date_gmt":"2024-11-06T04:44:15","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/sae-j-1979-22021\/"},"modified":"2024-11-06T04:44:15","modified_gmt":"2024-11-06T04:44:15","slug":"sae-j-1979-22021","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/sae\/sae-j-1979-22021\/","title":{"rendered":"SAE J 1979-2:2021"},"content":{"rendered":"
\n
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) \u201cgeneric\u201d test equipment.<\/div>\n
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:<\/div>\n
    \n
  • \n
    Diagnostic services (layer 7), specified in:<\/p>\n
      \n
    1. \n\u25cb<\/span><\/p>\n
      ISO 14229-1<\/div>\n<\/li>\n
    2. \n\u25cb<\/span><\/p>\n
      SAE J1979-2 OBDonUDS<\/div>\n<\/li>\n<\/ol>\n<\/div>\n<\/li>\n
    3. \n
      Presentation layer (layer 6), specified in:<\/p>\n
        \n
      1. \n\u25cb<\/span><\/p>\n
        SAE J1930, SAE J1930DA<\/div>\n<\/li>\n
      2. \n\u25cb<\/span><\/p>\n
        SAE J1979DA<\/div>\n<\/li>\n
      3. \n\u25cb<\/span><\/p>\n
        SAE J2012, SAE J2012DA<\/div>\n<\/li>\n
      4. \n\u25cb<\/span><\/p>\n
        SAE J1939DA, SAE J1939-73<\/div>\n<\/li>\n<\/ol>\n<\/div>\n<\/li>\n
      5. \n
        Session layer services (layer 5), specified in:<\/p>\n
          \n
        1. \n\u25cb<\/span><\/p>\n
          ISO 14229-2<\/div>\n<\/li>\n<\/ol>\n<\/div>\n<\/li>\n
        2. \n
          Transport layer services (layer 4), specified in:<\/p>\n
            \n
          1. \n\u25cb<\/span><\/p>\n
            DoCAN: ISO 15765-2 Transport protocol and network layer services<\/div>\n<\/li>\n
          2. \n\u25cb<\/span><\/p>\n
            ISO 15765-4<\/div>\n<\/li>\n
          3. \n\u25cb<\/span><\/p>\n
            DoIP: ISO 13400-2 Road vehicles – Diagnostic communication over Internet Protocol (DoIP) – Part 2:Transport protocol and network layer services<\/div>\n<\/li>\n<\/ol>\n<\/div>\n<\/li>\n
          4. \n
            Network layer services (layer 3), specified in:<\/p>\n
              \n
            1. \n\u25cb<\/span><\/p>\n
              DoCAN: ISO 15765-2 Transport protocol and network layer services<\/div>\n<\/li>\n
            2. \n\u25cb<\/span><\/p>\n
              ISO 15765-4 Requirements for emissions related systems<\/div>\n<\/li>\n
            3. \n\u25cb<\/span><\/p>\n
              DoIP: ISO 13400-2 Road vehicles – Diagnostic communication over Internet Protocol (DoIP) – Part 2:Transport protocol and network layer services<\/div>\n<\/li>\n<\/ol>\n<\/div>\n<\/li>\n
            4. \n
              Data link layer (layer 2), specified in:<\/p>\n
                \n
              1. \n\u25cb<\/span><\/p>\n
                DoCAN: ISO 15765-4, ISO 11898-1, -2<\/div>\n<\/li>\n
              2. \n\u25cb<\/span><\/p>\n
                DoIP: ISO 13400-3 Road vehicles – Diagnostic communication over Internet Protocol (DoIP) – Part 3: Wired vehicle interface based on IEEE 802.3<\/div>\n<\/li>\n<\/ol>\n<\/div>\n<\/li>\n
              3. \n
                Physical layer (layer 1), specified in:<\/p>\n
                  \n
                1. \n\u25cb<\/span><\/p>\n
                  DoCAN: ISO 15765-4, ISO 11898-1, -2, in accordance with Table 1<\/span><\/div>\n<\/li>\n
                2. \n\u25cb<\/span><\/p>\n
                  DoIP: ISO 13400-3 Road vehicles – Diagnostic communication over Internet Protocol (DoIP) – Part 3: Wired vehicle interface based on IEEE 802.3<\/div>\n<\/li>\n<\/ol>\n<\/div>\n<\/li>\n<\/ul>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

                  E\/E Diagnostic Test Modes: OBDonUDS<\/b><\/p>\n\n\n\n\n
                  Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
                  SAE<\/b><\/a><\/td>\n2021-04-22<\/td>\n96<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":683179,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2639],"product_tag":[],"class_list":{"0":"post-683171","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-sae","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/683171","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/683179"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=683171"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=683171"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=683171"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}