PAS 27145-3:2006 pdf download Road vehicles — Implementation of WWH-OBD communication requirements — Part 3: Common message dictionary
Scope
SO/PAS 27145 is intended to become the single communication standard for access to OBD-relatedinformation. To allow for a smooth migration from the existing communication standards to this futureworldwide standardized communication standard, the initial communication concept wil be based on CAN. Ina second step,ISO/PAS 27145 will be extended to define the world-wide harmonized OBD communicationstandard based on existing industry communications standards (e.g. lnternet Protocol) over Ethernet. Due tothe usage of standard network layer protocols, future extensions to optional physical layers (e.g. wireless) arepossible.
This part of ISO/PAS 27145 specifies the implementation of a subset of unified diaanostic services (UDS) asspecified in ISO 14229-1. The diagnostic services are used to communicate all diagnostic data as defined inSO/PAS 27145-2.
The subset of unified diagnostic services derives from the requirements stated in the WWH-OBD GTR (WorldWide Harmonised Global Technical Requlations). The common message set defined in this part isindependent of the underlying Transport, Network, Data Link and Physical Layer, This document does notspecify any requirements for the in-vehicle network architecture.
This part of ISO/PAS 27145 includes a superset of a modified version of ISO 14229-1. Several significantmodifications are included in this part in order to support the data set of SAE J1939, SO 15031-5 andISO 15031-6:
SO/PAS 27145-3 supports a 3-byte Unified Data ldentifier format in all services which support a 2-bytedata identifier format in the ISO 14229-1
SO/PAS 27145-3 supports a 4-byte Diagnostic Trouble Code format in all services which support a3-byte Diagnostic Trouble Code format in the ISO 14229-1.
ISO/PAS 27145-3 supports a separation of BaseDTC number from a FaiureTypeByte including thesymptom of the Diagnostic Trouble Code.
This part of ISO/PAS 27145 is designed to provide the basis of unified diagnostic services for future GTRmodules provided by legislation.
2 Normative references
The following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments)applies.
SO 7498-1, Information technology – Open Systems Interconnection – Basic Reference Model- Part 1:The Basic Model
ISO/EC 10731,Information technology – Open Systems Interconnection – Basic Reference Model-Conventions for the definition of OSI services
ISO 14229-1, Road vehicles 一 Unified diagnostic services (UDS)- Pat 1: Specification and requirements
ISO 15031-5, Road vehicles – Communication between vehicle and external test equipment for emissions-related diagnostics – Part 5: Emissions-related diagnostic services
ISO 15031-6,Road vehicles — Communication between vehicle and external test equipment for emissions.related diagnostics – Part 6: Diagnostic trouble code definition
SO/PAS 27145-1, Road vehicles – lmplementation of WWH-OBD communication requirements – Part 1:General information and use case definition
SO/PAS 27145-2 Road vehicles – lmplementation of WWH-OBD communication requirements – Part 2:Common emissions-related data dictionary
SO/PAS 27145-4,Road vehicles – lmplementation of WWH-OBD communication requirements – Part 4:Connection between vehicle and test equipment
SAE J1939-21, Recommended Practice for a Serial Control and Communication Vehicle Network – Data linklayer
SAE J1939-71, Recommended Practice for a Serial Control and Communication Vehicle Network – Vehicleapplication layer
SAE J1939-73Recommended Practice for a Serial Control and Communication Vehicle Network-Application layer- Diagnostics
Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/PAS 27145-1, ISO/PAS 27145-2and ISO 14229-1 apply.