This standard is important as it forms the basis for Unified Diagnostic Services (UDS) communication, which relies on sending multiframe CAN data packets. ![]() how to send data packets exceeding 8 bytes via CAN bus. ISO 15765-2: The ISO-TP standard describes the 'Transport Layer', i.e. ISO 11898: This standard describes the CAN bus data link layer and physical layer, serving as the basis for OBD2 communication in most cars today While OBD2 PID information is only available on-request by OBD2 test equipment, the J1939 protocol is used in most heavy-duty vehicles as the basic means for communicating CAN traffic. SAE J1939: The J1939 standard describes the data protocol used for heavy-duty vehicle communication. Vehicle OEMs may also decide to implement additional proprietary OBD2 PIDs beyond those outlined by the SAE J1979 standard. Implement in cars (though they are not required to do so). It also includes a list of standardized public OBD2 parameter IDs (OBD2 PIDs) that automotive OEMs may SAE J1979: The SAE J1979 standard describes the methods for requesting diagnostic information via the OBD2 protocol. ![]() Location and access to the OBD2 connector. ![]() The standard describes both the vehicle OBD2 connector and the connector used by the external test equipment (e.g. SAE J1962: This standard defindes the physical connector used for the OBD2 interfacing, i.e. Below we list some of the most relevant SAE/ISO standards related to OBD2:
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