ISO 27145-1:2012

INTERNATIONAL ISO
STANDARD 27145-1
First edition
2012-08-15
Road vehicles — Implementation of
World-Wide Harmonized On-Board
Diagnostics (WWH-OBD) communication
requirements —
Part 1:
General information and use case definition
Véhicules routiers — Mise en application des exigences de
communication pour le diagnostic embarqué harmonisé à l’échelle
mondiale (WWH-OBD) — Partie 1: Informations générales et définition
de cas d’usage
Reference number
©
ISO 2012
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ii © ISO 2012 – All rights reserved

Contents Page
Foreword .iv
0 Introduction . v
0.1 Overview . v
0.2 SAE document reference concept . v
0.3 SAE digital annex revision procedure . vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 2
3.1 Terms and definitions . 2
3.2 Abbreviated terms . 3
4 Conventions . 4
5 Document overview . 4
6 WWH-OBD use case overview . 7
6.1 Overview . 7
6.2 WWH-OBD use case clusters . 7
7 WWH-OBD use case definition . 8
7.1 UC 1 — Information about the emissions-related OBD system state . 8
7.2 UC 2 — Information about active and confirmed emissions-related malfunctions . 9
7.3 UC 3 — Information related to diagnosis for the purpose of repair .10
8 Vehicle on-board diagnostic . 11
8.1 VOBD definition . 11
8.2 The VOBD system . 11
8.3 The VOBD data set .14
8.4 The VOBD access method .14
Bibliography .19
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 27145-1 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical
and electronic equipment.
This first edition of ISO 21745-1 cancels and replaces ISO/PAS 27145-1:2006, which has been technically revised.
ISO 27145 consists of the following parts, under the general title Road vehicles — Implementation of World‑Wide
Harmonized On‑Board Diagnostics (WWH‑OBD) communication requirements:
— Part 1: General information and use case definition
— Part 2: Common data dictionary
— Part 3: Common message dictionary
— Part 4: Connection between vehicle and test equipment
The following parts are under preparation:
— Part 6: External test equipment
iv © ISO 2012 – All rights reserved

0 Introduction
0.1 Overview
The ISO 27145 series includes the communication between the vehicle’s on-board diagnostics (OBD) systems
and external test equipment within the scope of the World-Wide Harmonized On-Board Diagnostics Global
Technical Regulations (WWH-OBD GTR).
It has been established in order to apply the unified diagnostic services (specified in ISO 14229-1) to
WWH-OBD systems.
The ISO 27145 series includes the communication between the vehicle’s WWH-OBD systems and external
(off-board) “generic” test equipment within the scope of the country-specific regulatory requirements.
To achieve this, it is based on the Open Systems Interconnection (OSI) Basic Reference Model specified
in ISO/IEC 7498-1 and ISO/IEC 10731, which structures communication systems into seven layers. Where
mapped on this model, the services specified by ISO 27145 are divided into
— diagnostic services (layer 7), specified in ISO 27145-3 with reference to ISO 14229-1,
— presentation layer (layer 6), specified in ISO 27145-2 with reference to SAE J1930-DA, SAE J1939 Companion
Spreadsheet (SPNs), SAE J1939-73:2010, Appendix A (FMIs), SAE J1979-DA and SAE J2012-DA,
— session layer services (layer 5), specified in ISO 14229-2,
— transport layer services (layer 4), specified in ISO 27145-4 with reference to ISO 13400-2, ISO 15765-2
and ISO 15765-4,
— network layer services (layer 3), specified in ISO 27145-4 with reference to ISO 15765-4, ISO 15765-2 and
ISO 13400-2,
— data link layer (layer 2), specified in ISO 27145-4 with reference to ISO 11898-1, ISO 11898-2, ISO 15765-4,
ISO 13400-3 and IEEE 802.3, and
— physical layer (layer 1), specified in ISO 27145-4 with reference to ISO 11898-1, ISO 11898-2, ISO 15765-4,
ISO 13400-3 and IEEE 802.3,
in accordance with Table 1.
Table 1 — WWH-OBD specification reference applicable to the OSI layers
Applicability OSI seven layer WWH-OBD reference
Application (layer 7) ISO 14229-1, ISO 27145-3
ISO 27145-2,
Presentation (layer 6) SAE J1930-DA, SAE J1939 Companion Spreadsheet (SPNs),
SAE J1939-73:2010, Appendix A (FMIs), SAE J1979-DA, SAE J2012-DA
Seven layers
according to
Session (layer 5) ISO 14229-2
ISO/IEC 7498-
Transport (layer 4)
ISO 15765-2 DoCAN, ISO 13400-2 DoIP
1 and ISO/
ISO 15765-4 DoCAN TCP and IP
IEC 10731
Network (layer 3)
ISO 27145-4
Data link (layer 2) ISO 11898-1 CAN DLL,
ISO 13400-3 DoIP,
ISO 11898-2 CAN HS,
IEEE 802.3
Physical (layer 1)
ISO 15765-4 DoCAN
0.2 SAE document reference concept
ISO 27145 makes reference to several SAE documents which contain the terms, data and diagnostic trouble
code (DTC) definitions.
ISO 27145-2 defines a common data dictionary for the ISO 27145 series, according to the definitions in the
following documents (see Figure 1):
— SAE J1930-DA: this digital annex contains all standardized naming objects, terms and abbreviated terms.
— SAE J1939 Companion Spreadsheet and SAE J1939-73: SAE J1939 Companion Spreadsheet indexes
names for suspect parameter numbers (SPNs) that provide an alternative presentation format for
SAE J2012-DA DTCs. SPNs are combined with failure mode indicators (FMIs) to form the full alternative
presentation. FMIs are described in SAE J1939-73:2010, Appendix A.
NOTE The SAE J1939 Companion Spreadsheet is a document which supplements the SAE J1939 family of
standards and contains SPNs and parameter group numbers (PGNs).
— SAE J1979-DA: this digital annex contains all standardized data items such as data identifiers (DIDs), test
identifiers (TIDs), monitor identifiers (MIDs) and infotype identifiers (ITIDs).
— SAE J2012-DA: this digital annex contains all standardized data items such as DTC definitions and FTB
(failure type byte) definitions.
ISO 27145-2
WWH-OBD
common data dictionary
1 2
SAE J1930-DA
SAE J1939
digital annex of
SAE J1939-73:2010
SAE J2012-DA
[Companion
SAE J1979-DA electrical /electronic
[Appendix A]
digital annex of
Spreadsheet]
digital annex of E/E systems diagnostic
diagnostic trouble
diagnostic test modes terms, definitions,
code definitions
abbreviations and
acronyms
Key
1 SAE digital annexes: data definitions
2 SAE J1939 series of documents: DTC definitions
Figure 1 — SAE digital annex document reference
0.3 SAE digital annex revision procedure
New regulatory requirements drive new in-vehicle technology to lower emissions, improve safety, etc. It is
important to standardize new technology-related OBD monitor data and DTCs in order to support the external
(off-board) “generic” test equipment. All relevant information is proposed by the automotive industry, represented
by members of the appropriate SAE task force.
ISO 27145-2 references a “Change request form” for use with new data items to be defined by the SAE
task force for standardization. It is intended that the standardized data items be defined in SAE J1930-DA,
SAE J1979-DA, SAE J2012-DA and SAE J1939. It is intended that the documents be published on the SAE
store website once the information has been balloted and approved.
vi © ISO 2012 – All rights reserved

The revision request forms and instructions for updating the registers to ISO 27145 can be obtained on the
following data registration websites.
— For SAE J1930-DA: http://www.sae.org/servlets/works/committeeHome.do?comtID=TEVDS7
The column entitled “Resources” shows a document with the title: J1930-DA_Revision_Request_Form.
doc. Double click on the name to download the document with the filename: “SAE_J1930-DA_Revision_
Request_Form.doc”.
— For SAE J1939: http://www.sae.org/
Search “J1939 Request”, select “J1939 Request Processing Group”, and select “J1939 Request Processing
Form and Guidelines”.
— For SAE J1979-DA: http://www.sae.org/servlets/works/committeeHome.do?comtID=TEVDS14
The column entitled “Resources” shows a document with the title: J1979-DA_Revision_Request_Form.
doc. Double click on the name to download the document with the filename: “SAE_J1979-DA_Revision_
Request_Form.doc”.
— For SAE J2012-DA: http://www.sae.org/servlets/works/committeeHome.do?comtID=TEVDS9
The column entitled “Resources” shows a document with the title: J2012-DA_Revision_Request_Form.
doc. Double click on the name to download the document with the filename: “SAE_J2012-DA_Revision_
Request_Form.doc”.
It is intended that the revision request form be filled out with the request.
It is intended that e-mails with completed revision request forms as attachments be sent to:
E-mail: saej1930@sae.org
E-mail: saej1979@sae.org
E-mail: saej2012@sae.org
E-mail: saej1939@sae.org
INTERNATIONAL STANDARD ISO 27145-1:2012(E)
Road vehicles — Implementation of World-Wide Harmonized
On-Board Diagnostics (WWH-OBD) communication
requirements —
Part 1:
General information and use case definition
1 Scope
This part of ISO 27145 provides an overview of the structure and the partitioning of the different parts of
ISO 27145 and shows the relationship between the parts. In addition, it outlines the use case scenarios where
the ISO 27145 series is used. All terminology that is common throughout the ISO 27145 series is also outlined.
ISO 27145 is intended to become the single communication standard for access to OBD-related information. To
allow for a smooth migration from the existing communication standards to this future world-wide communication
standard, the initial communi
...