INTERNATIONAL 
STANDARD
ISO
27145-3
First edition
2012-08-15
Road vehicles — Implementation of 
World-Wide Harmonized On-Board 
Diagnostics (WWH-OBD) communication 
requirements —
Part 3: 
Common message dictionary
Véhicules routiers — Mise en application des exigences de 
communication pour le diagnostic embarqué harmonisé à l’échelle 
mondiale (WWH-OBD) —
Partie 3: Dictionnaire de messages communs
Reference number
ISO 27145-3:2012(E)
© ISO 2012
ISO 27145-3:2012(E)
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ISO 2012
© 
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Published in Switzerland
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© ISO 2012 – All rights reserved
Contents 
ISO 27145-3:2012(E)
Page
Foreword ............................................................................................................................................................................iv
Introduction ........................................................................................................................................................... v
0 
Overview ................................................................................................................................................................ v
0.1 
SAE document reference concept .................................................................................................................. v
0.2 
0.3 
SAE digital annex revision procedure .......................................................................................................... vi
Scope ...................................................................................................................................................................... 1
1 
Normative references ......................................................................................................................................... 1
2 
Terms,	definitions	and	abbreviated	terms .................................................................................................... 2
3	
Terms	and	definitions ......................................................................................................................................... 2
3.1	
Abbreviated	terms ............................................................................................................................................... 2
3.2	
Conventions .......................................................................................................................................................... 3
4 
Document overview ............................................................................................................................................ 3
5 
Unified	diagnostic	services	(UDS)	applicable	to	WWH-OBD ................................................................... 4
6	
General ................................................................................................................................................................... 4
6.1 
6.2 
UDS on WWH-OBD overview ........................................................................................................................... 5
Electronic control unit (ECU) response message length too long ........................................................ 5
6.3 
Message	byte	order ............................................................................................................................................ 5
6.4	
ReadDataByIdentifier	(0x22)	service .............................................................................................................. 6
6.5	
6.6 
ReadDTCInformation (0x19) service .............................................................................................................. 6
ClearDiagnosticInformation (0x14) service ................................................................................................14
6.7 
RoutineControl (0x31) service .......................................................................................................................15
6.8 
Application layer requirements .....................................................................................................................15
7 
7.1 
Application layer services ...............................................................................................................................15
Application layer protocol ...............................................................................................................................16
7.2 
Addressing and timing requirements ..........................................................................................................16
7.3 
Presentation layer requirements ...................................................................................................................25
8 
Session layer requirements ............................................................................................................................25
9 
Annex A (informative)	WWH-OBD-related	unified	diagnostic	service	examples ............................................26
Bibliography .....................................................................................................................................................................44
© ISO 2012 – All rights reserved 
 
iii
ISO 27145-3:2012(E)
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 27145-3 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical 
and electronic equipment.
This first edition of ISO 27145-3 cancels and replaces ISO/PAS 27145-3:2006, 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
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© ISO 2012 – All rights reserved
ISO 27145-3:2012(E)
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.  When 
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
Seven layers 
according to  
ISO/IEC 7498-1 and 
ISO/IEC 10731
OSI seven layer
Application (layer 7)
Presentation (layer 6)
Session (layer 5)
Transport (layer 4)
Network (layer 3)
Data link (layer 2)
Physical (layer 1)
WWH-OBD document reference
ISO 14229-1, ISO 27145-3
SAE J1930-DA, SAE J1939 Companion Spreadsheet (SPNs),  
SAE J1939-73:2010, Appendix A (FMIs), SAE J1979-DA, SAE J2012-DA
ISO 27145-2,  
ISO 14229-2
ISO 27145-4
ISO 15765-2 DoCAN, 
ISO 15765-4 DoCAN
ISO 11898-1 CAN DLL, 
ISO 11898-2 CAN HS, 
ISO 15765-4 DoCAN
ISO 13400-2 DoIP 
TCP and IP
ISO 13400-3 DoIP, 
IEEE 802.3
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 2012 – All rights reserved 
 
v
ISO 27145-3:2012(E)
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 
standards and contains SPNs and parameter group numbers (PGNs).
The SAE J1939 Companion Spreadsheet is a document which supplements the SAE J1939 family of 
—  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
digital annex of 
electrical /electronic 
systems diagnostic 
terms,  definitions, 
abbreviations  and 
acronyms
SAE J1939 
[Companion 
Spreadsheet]
SAE J1939-73:2010
[Appendix A]
SAE J2012-DA 
digital annex of 
diagnostic trouble 
code definitions
SAE J1979-DA
digital annex of E/E
diagnostic test modes
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.
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© ISO 2012 – All rights reserved
ISO 27145-3:2012(E)
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
© ISO 2012 – All rights reserved 
 
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