Overview
ISO 27145-2:2012/Amd 1:2023 is an important amendment to the international standard focused on the Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-OBD) communication requirements for road vehicles. This amendment updates Part 2: Common Data Dictionary, refining communication protocols and data definitions essential for global harmonization of vehicle diagnostics.
The standard is developed by ISO Technical Committee ISO/TC 22 (Road vehicles), Subcommittee SC 31 (Data communication). It ensures consistent, reliable diagnostic data exchange across various vehicle systems, supporting regulatory and environmental compliance worldwide.
Key Topics
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Updated Normative References:
The amendment replaces the previous reference “SAE J1939, Companion Spreadsheet” with “SAE J1939-DA, Digital Annex of serial control and communication heavy duty vehicle network data.” This update aligns the communication framework with the latest heavy-duty vehicle network standards.
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New Definition Guidelines for DID Assignments (Clause 6.3):
Introduction of guidelines for defining new Diagnostic Identifier (DID) assignments to maintain coherence and compatibility in data coding and diagnostics.
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GTR WWH-OBD Emissions System Parameters (Clause 6.4):
Defines emissions-related system parameters essential for Global Technical Regulation (GTR) compliance within WWH-OBD frameworks to enhance environmental monitoring effectiveness.
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DTCExtendedDataRecord Content Definition (Clause 8.3):
Specifies the data record content for extended diagnostic trouble code (DTC) information. For instance, the "FailureSpecificB1Counter" parameter measures the active hours of a specific failure, enabling precise diagnostic reporting.
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Revisions of Annexes:
Several annexes were deleted or restructured to streamline content, including removal of Annex A and Annex B, and relocation of Annex D content into the main body under Clause 8.3.
Applications
This ISO amendment has practical importance in various automotive and related sectors including:
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Vehicle Manufacturers:
Facilitates consistent implementation of onboard diagnostics communication, helping manufacturers meet international regulatory requirements and improve diagnostic accuracy.
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Emissions Testing and Regulatory Compliance:
Supports global harmonization of emissions diagnostics, essential for monitoring and controlling vehicle pollution levels in compliance with GTR and environmental legislation.
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Diagnostic Tool Developers:
Provides clear definitions and updated protocols for creating universal diagnostic tools and interfaces, ensuring interoperability across makes and markets.
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Fleet Operators and Service Providers:
Enhances the ability to monitor vehicle health and emissions through standardized, reliable on-board data, improving maintenance decisions and reducing downtime.
Related Standards
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ISO 27145 Series:
This amendment is part of the broader ISO 27145 series which covers various aspects of WWH-OBD data communication requirements.
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SAE J1939-DA:
The referenced digital annex standard critical for serial control and communication protocols in heavy-duty vehicle networks.
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Global Technical Regulation (GTR) on WWH-OBD:
Provides framework regulations harmonizing on-board diagnostic systems across global markets.
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ISO/IEC Directives:
Governs the editorial and maintenance procedures for developing and updating ISO standards, ensuring consistency and quality compliance.
Keywords: ISO 27145-2 amendment, WWH-OBD communication, common data dictionary, vehicle diagnostics standard, on-board diagnostics, emissions system parameters, SAE J1939-DA, diagnostic trouble codes, vehicle diagnostics interoperability, global automotive standards
Open preview (PDF)Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-OBD) communication requirements — Part 2: Common data dictionary — Amendment 1
