ISO 15031-5-2011 pdf free download.Road vehicles — Communication between vehicle and external equipment for emissions-related diagnostics — Part 5: Emissions-related diagnostic services.
4 Conventions
ISO 15031 is based on the conventions specified in the OSI Service Conventions (ISO/IEC 10731) as they apply for diagnostic services.
5 Document overview
Figure 2 illustrates the emissions-related OBD in ISO 15765-4, SAE J1850, ISO 9141-2, and ISO 14230-4.
The protocol initialization identifies whether ISO 15765-4 DoCAN or SAE J1850 or ISO 14230-4 DoK-Line or ISO 9141-2 is the data link layer supported by the vehicle. ISO 15031 references the standards as an applicable data link for emissions-related OBD.
This part of ISO 15031 specifies the applicable emissions-related diagnostic services. It specifies the data record structures and references SAE J1930-DA, SAE J1979-DA and SAE J2012-DA which include all emissions-related OBD data definitions.
6 Technical requirements
6.1 General requirements
The requirements specified in this clause are necessary to ensure proper operation of both the external test equipment and the vehicle during diagnostic procedures. External test equipment, when using the messages specified, shall not affect normal operation of the emission control system.
IMPORTANT — New emissions-related vehicle technology required the definition of new PIDs and INFOTYPEs. The data parameter set for several new definitions exceed the specified limit of message length for ISO 9141-2, ISO 14230-4 and SAE J1850 protocols.
It is the vehicle manufacturer’s responsibility to implement the ISO 15765-4 DoCAN protocol in order to achieve legislative compliance of the emissions-related OBD systems in the vehicle.
6.2 Diagnostic service requirements
6.2.1 Multiple responses to a single data request The request messages are functional messages, which means that the external test equipment will request data without knowledge of which ECU(s) on the vehicle will respond. In some vehicles, multiple ECUs may respond with the information requested. Any external test equipment requesting information shall therefore have provisions for receiving multiple responses. IMPORTANT — All emissions-related OBD ECUs, which at least support one of the services defined in this part of ISO 15031, shall support service 0x01 and PID 0x00. Service 0x01 with PID 0x00 is defined as the universal “initialization/keep alive/ping” message for all emissions-related OBD ECUs.ISO 15031-5 dpf download.