BS ISO 15765-4:2016 pdf download.Road vehicles — Diagnostic communication over Controller Area Network (DoCAN)
1 Scope
This part of ISO 15765 specifies requirements for Controller Area Networks (CAN) where one or more controllers comply with on-board diagnostics (OBD) or world-wide harmonized on-board diagnostics (WWH-OBD) regulations. The network presumes the use of an external test equipment for inspection and repair diagnostics, as defined by the regulations. The CAN network requirements for the vehicle and the external test equipment are based on the specifications of ISO 15765-2, ISO 11898-1 and ISO 11898-2. This part of ISO 15765 places restrictions on those International Standards for the fulfilment of the regulations. It does not specify in-vehicle CAN bus architecture, but seeks to ensure that the vehicle’s regulated CAN communications comply with external test equipment requirements. This part of ISO 15765 defines the requirements to successfully establish, maintain and terminate communication with a vehicle that implements the requirements of the OBD/WWH-OBD regulations. Plug-and-play communication capabilities among vehicles and test equipment are defined to assure the interoperation of external test equipment and vehicles. This part of ISO 15765 details all of the OSI layer requirements to achieve this goal. This part of ISO 15765 is the entry point for DoCAN (Diagnostic communication over Controller Area Network). Based on the results of the initialization, the external test equipment determines which protocol and diagnostic services are supported by the vehicle’s emissions-related system:
— legislated OBD: ISO 15031 (all parts);
— legislated WWH-OBD: ISO 27145 (all parts).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 11898-1, Road vehicles — Controller area network (CAN) — Part 1: Data link layer and physical signalling
ISO 11898-2, Roadvehicles — Controller area network (CAN) — Part 2: High-speed medium access unit
ISO 15031-5, Road vehicles — Communication between vehicle and external equipment for emissions-related diagnostics — Part 5: Emissions-related diagnostic services
ISO 15765-2, Road vehicles — Diagnostic communication over Controller Area Networks (DoCAN) —Part 2: Transport protocol and network layer services
ISO 27145-3, Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH- OBD) communication requirements — Part 3: Common message dictionary
Only vehicles that follow the WWH-OBD regimen will have ECUs that reply to the functional request service 22 16 DID F810 16 for protocol identification. Vehicles that respond only to the functional request service 01 16 PID 00 16 support earlier OBD communication methods. Vehicles that do not respond to either request do not support regulated OBD diagnostics under this part of ISO 15765. 6.3 describes this procedure.
BS ISO 15765-4:2016 pdf download
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