ISO 27145-6:2023

Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-OBD) communication requirements — Part 6: External test equipment

This document defines the requirements for the external test equipment as: — a means of establishing communications between a WWH-OBD-equipped vehicle and external test equipment; — a set of diagnostic services, including addressing methods, to be provided by the external test equipment in order to exercise the services defined in ISO 27145‑3. This document describes the minimum capabilities or functions in the external test equipment. Additional functionalities, for example, non WWH-OBD protocols or retrieval of repair and maintenance information, can be integrated into the external test equipment according to the test equipment manufacturer needs. The external test equipment designer ensures that no such capability or function can adversely affect either a WWH-OBD-equipped vehicle connected to the equipment, or the equipment itself. When the external test equipment implements functionality, which is not covered by ISO 27145‑3, this functionality is not linked to the timing requirements defined in this document.

Véhicules routiers — Mise en application des exigences de communication pour le diagnostic embarqué harmonisé à l'échelle mondiale (WWH-OBD) — Partie 6: Équipement d'essai externe

General Information

• Status: Published
• Publication Date: 04-May-2023
• ICS: 43.040.10 - Electrical and electronic equipment
• ICS: 43.180 - Diagnostic, maintenance and test equipment
• Technical Committee: ISO/TC 22/SC 31 - Data communication
• Drafting Committee: ISO/TC 22/SC 31/WG 5 - Test equipment/Data eXchange Formats
• Current Stage: 6060 - International Standard published
• Start Date: 05-May-2023
• Due Date: 20-Nov-2022
• Completion Date: 05-May-2023

Relations

• Revises: ISO 27145-6:2015 - Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-OBD) communication requirements — Part 6: External test equipment
• Effective Date: 26-Nov-2021

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 27145-6
Second edition
2023-05
Road vehicles — Implementation
of World-Wide Harmonized On-
Board Diagnostics (WWH-OBD)
communication requirements —
Part 6:
External test equipment
Véhicules routiers — Mise en application des exigences de
communication pour le diagnostic embarqué harmonisé à l'échelle
mondiale (WWH-OBD) —
Partie 6: Équipement d'essai externe
Reference number
ISO 27145-6:2023(E)
© ISO 2023

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ISO 27145-6:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2023 – All rights reserved

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ISO 27145-6:2023(E)
Contents Page
Foreword .v
Introduction . 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 . 2
4 Conventions . 3
5 Document overview .3
6 Requirements overview and principles . 5
6.1 Basic principles for the graphical notation . 5
6.2 Requirements clustering . 5
6.2.1 Overview . 5
6.2.2 Main requirements clusters . 5
7 External test equipment requirements . 7
7.1 General . 7
7.2 Applicability of requirements according to local legislation . 8
7.3 User instructions and guidelines . 8
7.4 Cluster “Mechanical requirements” . 8
7.5 Cluster “Electrical requirements and recommendations” . 9
7.6 Cluster “Communication setup” and connections . 9
7.6.1 Connections . 9
7.6.2 Communication setup . 10
7.7 Cluster “Diagnostic messages” .12
7.7.1 Overview . 12
7.7.2 Timing .12
7.7.3 Negative response handling .12
7.7.4 Error handling of no response from the vehicle . 14
7.7.5 Setup of ECU list . 15
7.7.6 Setting up ECU communication list . 16
7.7.7 Setting up data information list . . 16
7.7.8 Reading DTCs . 17
7.7.9 Setting up DTC information list . 17
7.7.10 Clear diagnostic information. 22
7.7.11 Continuously reading ECU data . 22
8 Roadside check test equipment .23
8.1 Definition . 23
8.2 Related use cases . 23
8.3 Implementation requirements . 24
8.3.1 Overview . 24
8.3.2 Application layer . 24
9 Inspection and maintenance (I/M) test equipment .25
9.1 Definition . 25
9.2 Related use cases . 25
9.3 Implementation requirements .25
9.3.1 General . 25
9.3.2 Application layer . 25
10 Repair shop test equipment .27
10.1 Definition . 27
10.2 Related use cases . 27
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ISO 27145-6:2023(E)
10.3 Implementation requirements . 27
10.3.1 Overview . 27
10.3.2 Application layer .28
11 Multiple test equipment communication .31
11.1 General . 31
11.2 Behaviour of external test equipment . 31
Bibliography .32
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ISO 27145-6:2023(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31,
Data communication.
This second edition cancels and replaces the first edition (ISO 27145-6:2015), which has been
technically revised.
The main changes are as follows:
— clarification about cable length;
— rewording for a better clarification of requirements.
A list of all parts in the ISO 27145 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
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ISO 27145-6:2023(E)
Introduction
Overview
This document 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).
This document has been established in order to apply the unified diagnostic services (specified in
ISO 14229-1) to WWH-OBD systems.
This document 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 this document are broken 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-
DA, SAE J1939-73:2022, 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 13400-2, ISO 15765-2,
and ISO 15765-4,
— data link layer (layer 2), specified in ISO 27145-4 with reference to ISO 11898-1, ISO 11898-2,
ISO 13400-3, ISO 15765-4, and IEEE 802.3, and
— physical layer (layer 1), specified in ISO 27145-4 with reference to ISO 11898-1, ISO 11898-2,
ISO 13400-3, ISO 15765-4, and IEEE 802.3,
in accordance with Table 1.
Table 1 — WWH-OBD specification reference applicable to the OSI layer
Applicability OSI seven layer WWH-OBD document reference
Application (layer 7) ISO 14229-1, ISO 27145-3
ISO 27145-2,
this doc-
SAE J1930-DA, SAE J1939-DA, SAE J1939-73:2022, Appendix A
ument
Presentation (layer 6)
(FMIs),
Seven layers
SAE J1979-DA, SAE J2012-DA
according to
Session (layer 5) ISO 14229-2
ISO/IEC 7498-1
and
Transport (layer 4)
ISO 15765-2 DoCAN, ISO 13400-2 DoIP
ISO/IEC 10731
ISO 15765-4 DoCAN TCP and IP
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
SAE document reference concept
This document references several SAE documents which contain all terms, data and diagnostic trouble
code (DTC) definitions.
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ISO 27145-6:2023(E)
ISO 27145-2 defines a common data dictionary for this document, according to the definitions in the
following documents (Figure 1):
— SAE J1930-DA: this digital annex contains all standardized naming objects, terms, and abbreviated
terms;
— SAE J1939-DA and SAE J1939-73: the digital annex 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. These FMIs are
described in SAE J1939-73:2022, Appendix A;
— 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.
Key
1 SAE digital annexes: data definitions
2 SAE J1939 series of documents: DTC definitions
Figure 1 — SAE digital annex document reference
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INTERNATIONAL STANDARD ISO 27145-6:2023(E)
Road vehicles — Implementation of World-Wide
Harmonized On-Board Diagnostics (WWH-OBD)
communication requirements —
Part 6:
External test equipment
1 Scope
This document defines the requirements for the external test equipment as:
— a means of establishing communications between a WWH-OBD-equipped vehicle and external test
equipment;
— a set of diagnostic services, including addressing methods, to be provided by the external test
equipment in order to exercise the services defined in ISO 27145-3.
This document describes the minimum capabilities or functions in the external test equipment.
Additional functionalities, for example, non WWH-OBD protocols or retrieval of repair and maintenance
information, can be integrated into the external test equipment according to the test equipment
manufacturer needs. The external test equipment designer ensures that no such capability or function
can adversely affect either a WWH-OBD-equipped vehicle connected to the equipment, or the equipment
itself.
When the external test equipment implements functionality, which is not covered by ISO 27145-3, this
functionality is not linked to the timing requirements defined in this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 13400-3, Road vehicles — Diagnostic communication over Internet Protocol (DoIP) — Part 3: Wired
vehicle interface based on IEEE 802.3
ISO 14229-1, Road vehicles — Unified diagnostic services (UDS) — Part 1: Application layer
ISO 14229-2, Road vehicles — Unified diagnostic services (UDS) — Part 2: Session layer services
ISO 15031-3, Road vehicles — Communication between vehicle and external equipment for emissions-
related diagnostics — Part 3: Diagnostic connector and related electrical circuits: Specification and use
ISO 15765-4, Road vehicles — Diagnostic communication over Controller Area Network (DoCAN) — Part 4:
Requirements for emissions-related systems
ISO 27145-1, Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-
OBD) communication requirements — Part 1: General information and use case definition
ISO 27145-2, Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-
OBD) communication requirements — Part 2: Common data dictionary
ISO 27145-3, Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-
OBD) communication requirements — Part 3: Common message dictionary
1
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ISO 27145-6:2023(E)
ISO 27145-4, Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-
OBD) communication requirements — Part 4: Connection between vehicle and test equipment
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 27145-1, ISO 27145-2 and
ISO 14229-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.2 Abbreviated terms
CALID calibration identification
CAN Controller Area Network
d.c. direct current
DoCAN Diagnostics over CAN
DoIP Diagnostics over IP
DTC Diagnostic Trouble Code
EMC electromagnetic compatibility
ESD electrostatic discharge
ETEREC external test equipment recommendation
ETEREQ external test equipment requirement
FMI Failure Mode Identifier
GTR Global Technical Regulations
HMI Human-Machine Interface
IP Internet Protocol
IUPR In Use (Monitor) Performance Ratio
MVCI Modular Vehicle Communication Interface
MI Malfunction Indication
MIL Malfunction Indication Lamp
NRC Negative Response Code
ODX Open Diagnostic data eXchange
VIN vehicle identification number
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ISO 27145-6:2023(E)
4 Conventions
This document is based on the conventions discussed in the OSI service conventions (ISO/IEC 10731) as
they apply to diagnostic services.
5 Document overview
Figure 2 shows the reference documents for this document.
This document specifies the following references:
a) ISO 27145-1 specifies the general structure of this document and the use cases applicable to WWH-
OBD GTR;
b) ISO 27145-2 specifies the common data dictionary with references to the following:
1) SAE J1930-DA defines the terms, definitions, abbreviated terms, etc.;
2) SAE J1939-DA contains all SPNs (parameters), PGNs (messages), and other SAE J1939 data
previously published in the SAE J1939 top level document;
NOTE The SAE J1939 series of documents presents the definition of emissions-related SPNs and FMIs
for use as DTCs.
3) SAE J1939 -73: 2022, Appendix A specifies the FMIs;
4) SAE 1979-DA specifies all data items;
5) SAE J2012-DA specifies the DTC definitions and failure type byte definitions;
c) This document specifies the diagnostic services defined in ISO 14229-1 that are applicable to
WWH-OBD GTR;
d) ISO 14229-2 specifies the standardized service primitive interface to separate application and
session layers from protocol transport and network layers;
e) ISO 27145-4 specifies the initialization procedure and includes references to:
1) ISO 15765-4 DoCAN;
2) the ISO 13400 series DoIP.
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ISO 27145-6:2023(E)
Key
1 The standardized service primitive interface is specified in ISO 14229-2.
Figure 2 — Reference documents for implementation of WWH-OBDonCAN
and WWH-OBDonIP according to the OSI model
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ISO 27145-6:2023(E)
6 Requirements overview and principles
6.1 Basic principles for the graphical notation
The flow graphs show the behaviour of the external test equipment. Hierarchical references, e.g. are
shown using round edged transparent rectangles. Figure 3 shows the notation semantics.
Figure 3 — Flow graph notation semantics used in this document
6.2 Requirements clustering
6.2.1 Overview
Each requirement in this document is assigned to one requirements cluster. The clusters cover technical
areas where the assigned requirements apply for.
Table 2 lists the technical requirements clusters. The table provides an overview of all requirements
clusters and the associated technical requirements. This list is a summary of the requirements included
in this document.
Each technical requirement is identified by the mnemonic “ETEREQ-” and an alpha-numeric number.
In addition, the alpha-numeric number includes the requirement cluster classifier according to Table 2.
Recommendations intended to guide the implementation are identified by the mnemonic “ETEREC-”.
6.2.2 Main requirements clusters
Table 2 provides an overview of the main clusters of external test equipment requirements. A
requirement cluster has at least one requirement and optional recommendations.
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ISO 27145-6:2023(E)
Table 2 — Main requirements clusters
# Main title of Classifier Brief description Related
cluster requirements
and recommen-
dations
1 Mechanical M Requirements to mechanically connect the external ETEREQ-M01,
requirements test equipment
ETEREQ-M02,
ETEREQ-M03,
ETEREQ-M04,
ETEREQ-M05,
ETEREQ-M06
2 Electrical E Electrical hardware related requirements and recom- ETEREQ-E01,
requirements mendations
ETEREC-E02,
ETEREQ-E03,
ETEREQ-E04,
ETEREQ-E05
3 Communication S Automatic hands-off determination of the communica- ETEREQ-S01,
setup and session tion interface
ETEREQ-S02,
—  hands-free DoCAN protocol initialization
ETEREC-S03,
—  hands-free DoIP protocol initialization and setup
ETEREQ-S04,
initialization
ETEREQ-S05,
  ETEREQ-S06,
ETEREQ-S07,
ETEREQ-S08,
ETEREQ-S09,
ETEREQ-S10,
ETEREQ-S11
4 Diagnostic D Requirements and recommendations related to the ETEREQ-D01,
messages diagnostic messages, like addressing information,
ETEREQ-D02,
sequences, dependencies
ETEREC-D03,
ETEREQ-D04,
ETEREQ-D05,
ETEREQ-D06,
ETEREQ-D07,
ETEREQ-D08
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ISO 27145-6:2023(E)
TTaabbllee 22 ((ccoonnttiinnueuedd))
# Main title of Classifier Brief description Related
cluster requirements
and recommen-
dations
  ETEREQ-D09,
ETEREQ-D10,
ETEREQ-D11,
ETEREQ-D12,
ETEREQ-D13,
ETEREQ-D14,
ETEREQ-D15,
ETEREQ-D16,
ETEREQ-D17,
ETEREQ-D18,
ETEREQ-D19,
ETEREQ-D20,
  ETEREQ-D21,
ETEREQ-D22,
ETEREQ-D23,
ETEREQ-D24,
ETEREQ-D25,
ETEREQ-D26,
ETEREQ-D27,
ETEREQ-D28,
ETEREQ-D29,
ETEREQ-D30,
ETEREQ-D31
5 Error handling F Requirements to have a proper communication error ETEREQ-F01,
handling
ETEREQ-F02,
ETEREQ-F03,
ETEREQ-F04
6 Use case specific U Requirements only related to specific use cases ETEREQ-U01,
requirements
ETEREQ-U02,
ETEREQ-U03,
ETEREQ-U04,
ETEREC-U05,
ETEREQ-U06
7 External test equipment requirements
7.1 General
This clause specifies all requirements which are applicable to the external test equipment. The
Introduction, Clause 9, and Clause 10 (respectively use cases 1, 2, and 3 as specified in ISO 27145-1)
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ISO 27145-6:2023(E)
include references to the requirements stated in this clause. The term ‘external test equipment’
addresses all equipment that will be used in compliance with the use cases stated in this document, e.g.
a repair shop external test equipment or an installed diagnostic data recorder. As the test equipment is
to be used for legislated OBD, it can be mounted in the car and attached to the OBD diagnostic interface,
but not integrated into the internal network. Figure 4 shows the general behaviour of the external text
equipment.
Figure 4 — General behaviour of external test equipment
7.2 Applicability of requirements according to local legislation
This document is based on the requirements established by the GTR #5, only. Local legislation can
require additional data to be supported for each use case as specified in this document. The additional
data are defined in SAE J1979-DA and SAE J1939-DA.
7.3 User instructions and guidelines
ETEREQ-M01 If the chosen connector supports detection of ignition/run status, the external test
equipment shall verify that the ignition is active before starting any action.
ETEREQ-M02 If the chosen connector does not support the detection of ignition/run status, the ex-
ternal test equipment shall ask the user to confirm ignition/run status active before
starting any action.
7.4 Cluster “Mechanical requirements”
ETEREQ-M03 To conne
...

© ISO 2022 – All rights reserved
2022-12-02
2023-01
ISO/FDIS 27145-6:20222023(E)
ISO/TC 22/SC 31/WG5
Secretariat: DIN
Road vehicles — Implementation of Word-Wide Harmonized On-Board Diagnostics
(WWH-OBD) communication requirements — Part 6: External test equipment
Véhicules routier — Mise en œuvre des exigences de communication du diagnostic
embarqué mondial harmonisé (WWH-OBD) — Partie 6: Equipement d'essai externe
Document type:
Document subtype:
Document stage:
Document language:

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ISO/FDIS 27145-6:20222023(E)
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no
part of this publication may be reproduced or utilized otherwise in any form or by any means,
electronic or mechanical, including photocopying, or posting on the internet or an intranet, without
prior written permission. Permission can be requested from either ISO at the address below or
ISO's member body in the country of the requester.
ISO Copyright Office
CP 401 • CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: [e-mail]
Website: www.iso.org
Published in Switzerland.
ii © ISO 2022 2023 – All rights reserved

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ISO/FDIS 27145-6:20222023(E)
Contents Page
Foreword . v
Introduction . 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 . 2
4 Conventions . 3
5 Document overview . 3
6 Requirements overview and principles . 6
6.1 Basic principles for the graphical notation . 6
6.2 Requirements clustering . 7
6.2.1 Overview . 7
6.2.2 Main requirements clusters . 7
7 External test equipment requirements . 9
7.1 General . 9
7.2 Applicability of requirements according to local legislation . 10
7.3 User instructions and guidelines . 10
7.4 Cluster “Mechanical requirements” . 11
7.5 Cluster “Electrical requirements and recommendations” . 11
7.6 Cluster “Communication setup” and connections . 11
7.6.1 Connections . 11
7.6.2 Communication setup . 12
7.7 Cluster “Diagnostic messages” . 15
7.7.1 Overview . 15
7.7.2 Timing . 15
7.7.3 Negative response handling . 15
7.7.4 Error handling of no response from the vehicle . 18
7.7.5 Setup of ECU list . 20
7.7.6 Setting up ECU communication list . 20
7.7.7 Setting up data information list . 22
7.7.8 Reading DTCs . 22
7.7.9 Setting up DTC information list . 22
7.7.10 Clear diagnostic information . 28
7.7.11 Continuously reading ECU data . 28
8 Roadside check test equipment . 30
8.1 Definition . 30
8.2 Related use cases . 30
8.3 Implementation requirements . 30
8.3.1 Overview . 30
8.3.2 Application layer . 30
9 Inspection and maintenance (I/M) test equipment . 32
9.1 Definition . 32
9.2 Related use cases . 32
9.3 Implementation requirements . 32
9.3.1 General . 32
9.3.2 Application layer . 32
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ISO/FDIS 27145-6:20222023(E)
10 Repair shop test equipment . 35
10.1 Definition . 35
10.2 Related use cases . 35
10.3 Implementation requirements . 35
10.3.1 Overview . 35
10.3.2 Application layer . 36
11 Multiple test equipment communication . 40
11.1 General . 40
11.2 Behaviour of external test equipment . 40
Bibliography . 41

iv © ISO 2022 2023 – All rights reserved

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ISO/FDIS 27145-6:20222023(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the World
Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.htmlthe following URL: .
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31,
Data communication.
This second edition cancels and replaces the first edition (ISO 27145-6:2015), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— clarification about cable length;
— rewording for a better clarification of requirements.
A list of all parts in the ISO 27145 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31,
Data communication.
© ISO 2022 2023 – All rights reserved v

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ISO/FDIS 27145-6:20222023(E)
Introduction
Overview
This document 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).
This document has been established in order to apply the unified diagnostic services (specified in
ISO 14229-1) to WWH-OBD systems.
This document 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 this document are broken 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-
DA, SAE J1939-73:2022, 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 13400-2,
ISO 15765-2, and ISO 15765-4,
— data link layer (layer 2), specified in ISO 27145-4 with reference to ISO 11898-1, ISO 11898-2,
ISO 13400-3, ISO 15765-4, and IEEE 802.3, and
— physical layer (layer 1), specified in ISO 27145-4 with reference to ISO 11898-1, ISO 11898-2,
ISO 13400-3, ISO 15765-4, and IEEE 802.3,
in accordance with Table 1.
Table 1 — WWH-OBD specification reference applicable to the OSI layer
Applicability OSI seven layer WWH-OBD document reference
Application (layer 7) ISO 14229-1, ISO 27145-3
ISO
27145-6
ISO 27145-2,
this
SAE J1930-DA, SAE J1939-DA, SAE J1939-73:2022, Appendix A
Presentation (layer 6)
docume
(FMIs),
nt
SAE J1979-DA, SAE J2012-DA
Seven layerlayers
according to
Session (layer 5) ISO 14229-2
ISO/IEC 7498-1
and
Transport (layer 4)
ISO 15765-2 DoCAN, ISO 13400-2 DoIP
ISO/IEC 10731
ISO 15765-4 DoCAN TCP and IP
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
SAE document reference concept
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ISO/FDIS 27145-6:20222023(E)
This document references several SAE documents which contain all terms, data and diagnostic trouble
code (DTC) definitions.
ISO 27145-2 defines a common data dictionary for this document, according to the definitions in the
following documents (Figure 1):
— SAE J1930-DA: this digital annex contains all standardized naming objects, terms, and abbreviated
terms;
— SAE J1939-DA and SAE J1939-73: the digital annex 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. These FMIs are
described in SAE J1939-73:2022, Appendix A;
— 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.


Key
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ISO/FDIS 27145-6:20222023(E)
1 SAE digital annexes: data definitions
2 SAE J1939 series of documents: DTC definitions
Figure 1 — SAE digital annex document reference
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FINAL DRAFT INTERNATIONAL STANDARD ISO/DISFDIS 27145-6:20222023(E)

Road vehicles — Implementation of Word-Wide Harmonized On-
Board Diagnostics (WWH-OBD) communication requirements —
Part 6: External test equipment
1 Scope
This document defines the requirements for the external test equipment as:
— a means of establishing communications between a WWH-OBD-equipped vehicle and external test
equipment;
— a set of diagnostic services, including addressing methods, to be provided by the external test
equipment in order to exercise the services defined in ISO 27145-3.
This document describes the minimum capabilities or functions in the external test equipment.
Additional functionalityfunctionalities, for example, non WWH-OBD protocols or retrieval of repair and
maintenance information, can be integrated into the external test equipment according to the test
equipment manufacturer needs. The external test equipment designer ensures that no such capability or
function can adversely affect either a WWH-OBD-equipped vehicle connected to the equipment, or the
equipment itself.
When the external test equipment implements functionality, which is not covered by ISO 27145-3, this
functionality is not linked to the timing requirements defined in this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 13400--3, Road vehicles — Diagnostic communication over Internet Protocol (DoIP) — Part 3: Wired
vehicle interface based on IEEE 802.3
ISO 14229-1, Road vehicles — Unified diagnostic services (UDS) — Part 1: Application layer
ISO 14229-2, Road vehicles — Unified diagnostic services (UDS) — Part 2: Session layer services
ISO 15031-3, Road vehicles — Communication between vehicle and external equipment for emissions-
related diagnostics — Part 3: Diagnostic connector and related electrical circuits: Specification and use
ISO 15765-4, Road vehicles — Diagnostic communication over Controller Area Network (DoCAN) — Part
4: Requirements for emissions-related systems
ISO 27145-1, Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-
OBD) communication requirements — Part 1: General information and use case definition
ISO 27145-2, Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-
OBD) communication requirements — Part 2: Common data dictionary
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ISO/FDIS 27145-6:2023(E)
ISO 27145-3, Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-
OBD) communication requirements — Part 3: Common message dictionary
ISO 27145-4, Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-
OBD) communication requirements — Part 4: Connection between vehicle and test equipment
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 27145-1, ISO 27145-2,
ISO 14229-1, and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.2 Abbreviated terms
CALID calibration identification
CAN Controller Area Network
d.c. direct current
DoCAN Diagnostics over CAN
DoIP Diagnostics over IP
DTC Diagnostic Trouble Code
EMC electromagnetic compatibility
ESD electrostatic discharge
ETEREC external test equipment recommendation
ETEREQ external test equipment requirement
FMI Failure Mode Identifier
GTR Global Technical Regulations
HMI Human-Machine Interface
IP Internet Protocol
IUPR In Use (Monitor) Performance Ratio
MVCI Modular Vehicle Communication Interface
MI Malfunction Indication
MIL Malfunction Indication Lamp
NRC Negative Response Code
ODX Open Diagnostic data eXchange
VIN vehicle identification number
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ISO/FDIS 27145-6:2023(E)
4 Conventions
This document is based on the conventions discussed in the OSI service conventions (ISO/IEC 10731) as
they apply to diagnostic services.
5 Document overview
Figure 2 shows the reference documents for this document.
This document specifies the following references:
a) ISO 27145-1 specifies the general structure of this document and the use cases applicable to WWH-
OBD GTR;
b) ISO 27145-2 specifies the common data dictionary with references to the following:
1) SAE J1930-DA defines the terms, definitions, abbreviated terms, etc.;
2) SAE J1939-DA contains all SPNs (parameters), PGNs (messages), and other SAE J1939 data
previously published in the SAE J1939 top level document;
NOTE The SAE J1939 series of documents presents the definition of emissions-related SPNs and FMIs for use
as DTCs.
3) SAE J1939-73:2022, Appendix A specifies the FMIs;
4) SAE 1979-DA specifies all data items;
5) SAE J2012-DA specifies the DTC definitions and failure type byte definitions;
c) This document specifies the diagnostic services defined in ISO 14229-1 that are applicable to WWH-
OBD GTR;
d) ISO 14229-2 specifies the standardized service primitive interface to separate application and
session layers from protocol transport and network layers;
e) ISO 27145-4 specifies the initialization procedure and includes references to:
1) ISO 15765-4 DoCAN;
2) the ISO 13400 series DoIP.

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ISO/FDIS 27145-6:2023(E)

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ISO/FDIS 27145-6:2023(E)

Key
1 The standardized service primitive interface is specified in ISO 14229-2.
Figure 2 — Reference documents for implementation of WWH-OBDonCAN
and WWH-OBDonIP according to the OSI model
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ISO/FDIS 27145-6:2023(E)
6 Requirements overview and principles
6.1 Basic principles for the graphical notation
The flow graphs show the behaviour of the external test equipment. Hierarchical references, e.g. are
shown using round edged transparent rectangles. Figure 3 shows the notation semantics.


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ISO/FDIS 27145-6:2023(E)

Figure 3 — Flow graph notation semantics used in this document
6.2 Requirements clustering
6.2.1 Overview
Each requirement in this document is assigned to one requirements cluster. The clusters cover technical
areas where the assigned requirements apply for.
Table 2 lists the technical requirements clusters. The table provides an overview of all requirements
clusters and the associated technical requirements. This list is a summary of the requirements included
in this document.
Each technical requirement is identified by the mnemonic “ETEREQ-” and an alpha-numeric number. In
addition, the alpha-numeric number includes the requirement cluster classifier according to Table 2.
Recommendations intended to guide the implementation are identified by the mnemonic “ETEREC-”.
6.2.2 Main requirements clusters
Table 2 provides an overview of the main clusters of external test equipment requirements. A
requirement cluster has at least one requirement and optional recommendations.
Table 2 — Main requirements clusters
# Main title of Classifier Brief description Related
cluster requirements
and
recommendatio
ns
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ISO/FDIS 27145-6:2023(E)
1 Mechanical M Requirements to mechanically connect the external test ETEREQ-M01,
requirements equipment
ETEREQ-M02,
ETEREQ-M03,
ETEREQ-M04,
ETEREQ-M05,
ETEREQ-M06
2 Electrical E Electrical hardware related requirements and ETEREQ-E01,
requirements recommendations
ETEREC-E02,
ETEREQ-E03,
ETEREQ-E04,
ETEREQ-E05
3 Communication S Automatic hands-off determination of the ETEREQ-S01,
setup and session communication interface
ETEREQ-S02,
—  hands-free DoCAN protocol initialization
ETEREC-S03,
—  hands-free DoIP protocol initialization and setup
ETEREQ-S04,
initialization
ETEREQ-S05,
    ETEREQ-S06,
ETEREQ-S07,
ETEREQ-S08,
ETEREQ-S09,
ETEREQ-S10,
ETEREQ-S11
4 Diagnostic D Requirements and recommendations related to the ETEREQ-D01,
messages diagnostic messages, like addressing information,
ETEREQ-D02,
sequences, dependencies
ETEREC-D03,
ETEREQ-D04,
ETEREQ-D05,
ETEREQ-D06,
ETEREQ-D07,
ETEREQ-D08
    ETEREQ-D09,
ETEREQ-D10,
ETEREQ-D11,
ETEREQ-D12,
ETEREQ-D13,
ETEREQ-D14,
ETEREQ-D15,
ETEREQ-D16,
ETEREQ-D17,
ETEREQ-D18,
ETEREQ-D19,
ETEREQ-D20,
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ISO/FDIS 27145-6:2023(E)
    ETEREQ-D21,
ETEREQ-D22,
ETEREQ-D23,
ETEREQ-D24,
ETEREQ-D25,
ETEREQ-D26,
ETEREQ-D27,
ETEREQ-D28,
ETEREQ-D29,
ETEREQ-D30,
ETEREQ-D31
5 Error handling F Requirements to have a proper communication error ETEREQ-F01,
handling
ETEREQ-F02,
ETEREQ-F03,
ETEREQ-F04
6 Use case specific U Requirements only related to specific use cases ETEREQ-U01,
requirements
ETEREQ-U02,
ETEREQ-U03,
ETEREQ-U04,
ETEREC-U05,
ETEREQ-U06
7 External test equipment requirements
7.1 General
This clause specifies all requirements which are applicable to the external test equipment. The
Introduction, Clause 9, and Clause 10 (respectively use cases 1, 2, and 3 as specified in ISO 27145-1)
include references to the requirements stated in this clause. The term ‘external test equipment’ addresses
all equipment that will be used in compliance with the use cases stated in this document, e.g. a repair
shop external test equipment or an installed diagnostic data recorder. As the test equipment is to be used
for legislated OBD, it can be mounted in the car and attached to the OBD diagnostic interface, but not
integrated into the internal network. Figure 4 shows the general behaviour of the external text
equipment.
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ISO/FDIS 27145-6:2023(E)


Figure 4 — General behaviour of external test equipment
7.2 Applicability of requirements according to local legislation
This document is based on the requirements established by the GTR #5, only. Local legislation can require
additional data to be supported for each use case as specified in this document. The additional data are
defined in SAE J1979-DA and SAE J1939-DA.
7.3 User instructions and guidelines
ETEREQ-M01 If the chosen connector supports detection of ignition/run status, the external test
equipment shall verify that the ignition is active before starting any action.
ETEREQ-M02 If the chosen connector does not support the detection of ignition/run status, the
external test equipment shall ask the user to confirm ignition/run status active before
starting any action.
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ISO/FDIS 27145-6:2023(E)
7.4 Cluster “Mechanical requirements”
ETEREQ-M03 To connect the external test equipment to the vehicle, one of the following
ISO 15031-3 type connectors shall be used:
—  type A (12 V d.c.), or
—  type B (12 V d.c. or 24 V d.c.).
ETEREQ-M04 The length of the cable (from external test equipment interface transceiver to
diagnostic connector) shall not exceed the maximum length of 2 m (twisted and
unshielded) and the maximum length of 5 m (twisted and shielded).
NOTE  More restrictive requirements always supersede less restrictive
requirements.
ETEREQ-M05 If the external test equipment supports the DoCAN protocol, the cable mechanical
(and electrical) configuration and characteristics shall be in accordance with
ISO 15765-4.
ETEREQ-M06 If the external test equipment supports the DoIP protocol, the cable mechanical (and
electrical) configuration and characteristics shall be in accordance with
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 27145-6
ISO/TC 22/SC 31
Road vehicles — Implementation
Secretariat: DIN
of World-Wide Harmonized On-
Voting begins on:
2023-02-01 Board Diagnostics (WWH-OBD)
communication requirements —
Voting terminates on:
2023-03-29
Part 6:
External test equipment
Véhicules routiers — Mise en application des exigences de
communication pour le diagnostic embarqué harmonisé à l'échelle
mondiale (WWH-OBD) —
Partie 6: Équipement d'essai externe
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 27145-6:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 1 ----------------------
ISO/FDIS 27145-6:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 27145-6
ISO/TC 22/SC 31
Road vehicles — Implementation
Secretariat: DIN
of World-Wide Harmonized On-
Voting begins on:
Board Diagnostics (WWH-OBD)
communication requirements —
Voting terminates on:
Part 6:
External test equipment
Véhicules routiers — Mise en application des exigences de
communication pour le diagnostic embarqué harmonisé à l'échelle
mondiale (WWH-OBD) —
Partie 6: Équipement d'essai externe
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: [phone]
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: [e-mail]
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 27145-6:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023

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ISO/FDIS 27145-6:2023(E)
Contents Page
Foreword .v
Introduction . 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 . 2
4 Conventions . 3
5 Document overview .3
6 Requirements overview and principles . 5
6.1 Basic principles for the graphical notation . 5
6.2 Requirements clustering . 5
6.2.1 Overview . 5
6.2.2 Main requirements clusters . 5
7 External test equipment requirements . 7
7.1 General . 7
7.2 Applicability of requirements according to local legislation . 8
7.3 User instructions and guidelines . 8
7.4 Cluster “Mechanical requirements” . 8
7.5 Cluster “Electrical requirements and recommendations” . 9
7.6 Cluster “Communication setup” and connections . 9
7.6.1 Connections . 9
7.6.2 Communication setup . 10
7.7 Cluster “Diagnostic messages” .12
7.7.1 Overview . 12
7.7.2 Timing .12
7.7.3 Negative response handling .12
7.7.4 Error handling of no response from the vehicle . 14
7.7.5 Setup of ECU list . 15
7.7.6 Setting up ECU communication list . 16
7.7.7 Setting up data information list . . 16
7.7.8 Reading DTCs . 17
7.7.9 Setting up DTC information list . 17
7.7.10 Clear diagnostic information. 22
7.7.11 Continuously reading ECU data . 22
8 Roadside check test equipment .23
8.1 Definition . 23
8.2 Related use cases . 23
8.3 Implementation requirements . 24
8.3.1 Overview . 24
8.3.2 Application layer . 24
9 Inspection and maintenance (I/M) test equipment .25
9.1 Definition . 25
9.2 Related use cases . 25
9.3 Implementation requirements .25
9.3.1 General . 25
9.3.2 Application layer . 25
10 Repair shop test equipment .27
10.1 Definition . 27
10.2 Related use cases . 27
iii
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ISO/FDIS 27145-6:2023(E)
10.3 Implementation requirements . 27
10.3.1 Overview . 27
10.3.2 Application layer .28
11 Multiple test equipment communication .31
11.1 General . 31
11.2 Behaviour of external test equipment . 31
Bibliography .32
iv
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ISO/FDIS 27145-6:2023(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31,
Data communication.
This second edition cancels and replaces the first edition (ISO 27145-6:2015), which has been
technically revised.
The main changes are as follows:
— clarification about cable length;
— rewording for a better clarification of requirements.
A list of all parts in the ISO 27145 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
v
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ISO/FDIS 27145-6:2023(E)
Introduction
Overview
This document 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).
This document has been established in order to apply the unified diagnostic services (specified in
ISO 14229-1) to WWH-OBD systems.
This document 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 this document are broken 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-
DA, SAE J1939-73:2022, 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 13400-2, ISO 15765-2,
and ISO 15765-4,
— data link layer (layer 2), specified in ISO 27145-4 with reference to ISO 11898-1, ISO 11898-2,
ISO 13400-3, ISO 15765-4, and IEEE 802.3, and
— physical layer (layer 1), specified in ISO 27145-4 with reference to ISO 11898-1, ISO 11898-2,
ISO 13400-3, ISO 15765-4, and IEEE 802.3,
in accordance with Table 1.
Table 1 — WWH-OBD specification reference applicable to the OSI layer
Applicability OSI seven layer WWH-OBD document reference
Application (layer 7) ISO 14229-1, ISO 27145-3
ISO 27145-2,
this doc-
SAE J1930-DA, SAE J1939-DA, SAE J1939-73:2022, Appendix A
ument
Presentation (layer 6)
(FMIs),
Seven layers
SAE J1979-DA, SAE J2012-DA
according to
Session (layer 5) ISO 14229-2
ISO/IEC 7498-1
and
Transport (layer 4)
ISO 15765-2 DoCAN, ISO 13400-2 DoIP
ISO/IEC 10731
ISO 15765-4 DoCAN TCP and IP
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
SAE document reference concept
This document references several SAE documents which contain all terms, data and diagnostic trouble
code (DTC) definitions.
vi
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ISO/FDIS 27145-6:2023(E)
ISO 27145-2 defines a common data dictionary for this document, according to the definitions in the
following documents (Figure 1):
— SAE J1930-DA: this digital annex contains all standardized naming objects, terms, and abbreviated
terms;
— SAE J1939-DA and SAE J1939-73: the digital annex 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. These FMIs are
described in SAE J1939-73:2022, Appendix A;
— 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.
Key
1 SAE digital annexes: data definitions
2 SAE J1939 series of documents: DTC definitions
Figure 1 — SAE digital annex document reference
vii
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 27145-6:2023(E)
Road vehicles — Implementation of World-Wide
Harmonized On-Board Diagnostics (WWH-OBD)
communication requirements —
Part 6:
External test equipment
1 Scope
This document defines the requirements for the external test equipment as:
— a means of establishing communications between a WWH-OBD-equipped vehicle and external test
equipment;
— a set of diagnostic services, including addressing methods, to be provided by the external test
equipment in order to exercise the services defined in ISO 27145-3.
This document describes the minimum capabilities or functions in the external test equipment.
Additional functionalities, for example, non WWH-OBD protocols or retrieval of repair and maintenance
information, can be integrated into the external test equipment according to the test equipment
manufacturer needs. The external test equipment designer ensures that no such capability or function
can adversely affect either a WWH-OBD-equipped vehicle connected to the equipment, or the equipment
itself.
When the external test equipment implements functionality, which is not covered by ISO 27145-3, this
functionality is not linked to the timing requirements defined in this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 13400-3, Road vehicles — Diagnostic communication over Internet Protocol (DoIP) — Part 3: Wired
vehicle interface based on IEEE 802.3
ISO 14229-1, Road vehicles — Unified diagnostic services (UDS) — Part 1: Application layer
ISO 14229-2, Road vehicles — Unified diagnostic services (UDS) — Part 2: Session layer services
ISO 15031-3, Road vehicles — Communication between vehicle and external equipment for emissions-
related diagnostics — Part 3: Diagnostic connector and related electrical circuits: Specification and use
ISO 15765-4, Road vehicles — Diagnostic communication over Controller Area Network (DoCAN) — Part 4:
Requirements for emissions-related systems
ISO 27145-1, Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-
OBD) communication requirements — Part 1: General information and use case definition
ISO 27145-2, Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-
OBD) communication requirements — Part 2: Common data dictionary
ISO 27145-3, Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-
OBD) communication requirements — Part 3: Common message dictionary
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ISO/FDIS 27145-6:2023(E)
ISO 27145-4, Road vehicles — Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-
OBD) communication requirements — Part 4: Connection between vehicle and test equipment
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 27145-1, ISO 27145-2,
ISO 14229-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.2 Abbreviated terms
CALID calibration identification
CAN Controller Area Network
d.c. direct current
DoCAN Diagnostics over CAN
DoIP Diagnostics over IP
DTC Diagnostic Trouble Code
EMC electromagnetic compatibility
ESD electrostatic discharge
ETEREC external test equipment recommendation
ETEREQ external test equipment requirement
FMI Failure Mode Identifier
GTR Global Technical Regulations
HMI Human-Machine Interface
IP Internet Protocol
IUPR In Use (Monitor) Performance Ratio
MVCI Modular Vehicle Communication Interface
MI Malfunction Indication
MIL Malfunction Indication Lamp
NRC Negative Response Code
ODX Open Diagnostic data eXchange
VIN vehicle identification number
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ISO/FDIS 27145-6:2023(E)
4 Conventions
This document is based on the conventions discussed in the OSI service conventions (ISO/IEC 10731) as
they apply to diagnostic services.
5 Document overview
Figure 2 shows the reference documents for this document.
This document specifies the following references:
a) ISO 27145-1 specifies the general structure of this document and the use cases applicable to WWH-
OBD GTR;
b) ISO 27145-2 specifies the common data dictionary with references to the following:
1) SAE J1930-DA defines the terms, definitions, abbreviated terms, etc.;
2) SAE J1939-DA contains all SPNs (parameters), PGNs (messages), and other SAE J1939 data
previously published in the SAE J1939 top level document;
NOTE The SAE J1939 series of documents presents the definition of emissions-related SPNs and FMIs
for use as DTCs.
3) SAE J1939 -73: 2022, Appendix A specifies the FMIs;
4) SAE 1979-DA specifies all data items;
5) SAE J2012-DA specifies the DTC definitions and failure type byte definitions;
c) This document specifies the diagnostic services defined in ISO 14229-1 that are applicable to
WWH-OBD GTR;
d) ISO 14229-2 specifies the standardized service primitive interface to separate application and
session layers from protocol transport and network layers;
e) ISO 27145-4 specifies the initialization procedure and includes references to:
1) ISO 15765-4 DoCAN;
2) the ISO 13400 series DoIP.
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ISO/FDIS 27145-6:2023(E)
Key
1 The standardized service primitive interface is specified in ISO 14229-2.
Figure 2 — Reference documents for implementation of WWH-OBDonCAN
and WWH-OBDonIP according to the OSI model
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ISO/FDIS 27145-6:2023(E)
6 Requirements overview and principles
6.1 Basic principles for the graphical notation
The flow graphs show the behaviour of the external test equipment. Hierarchical references, e.g. are
shown using round edged transparent rectangles. Figure 3 shows the notation semantics.
Figure 3 — Flow graph notation semantics used in this document
6.2 Requirements clustering
6.2.1 Overview
Each requirement in this document is assigned to one requirements cluster. The clusters cover technical
areas where the assigned requirements apply for.
Table 2 lists the technical requirements clusters. The table provides an overview of all requirements
clusters and the associated technical requirements. This list is a summary of the requirements included
in this document.
Each technical requirement is identified by the mnemonic “ETEREQ-” and an alpha-numeric number.
In addition, the alpha-numeric number includes the requirement cluster classifier according to Table 2.
Recommendations intended to guide the implementation are identified by the mnemonic “ETEREC-”.
6.2.2 Main requirements clusters
Table 2 provides an overview of the main clusters of external test equipment requirements. A
requirement cluster has at least one requirement and optional recommendations.
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ISO/FDIS 27145-6:2023(E)
Table 2 — Main requirements clusters
# Main title of Classifier Brief description Related
cluster requirements
and recommen-
dations
1 Mechanical M Requirements to mechanically connect the external ETEREQ-M01,
requirements test equipment
ETEREQ-M02,
ETEREQ-M03,
ETEREQ-M04,
ETEREQ-M05,
ETEREQ-M06
2 Electrical E Electrical hardware related requirements and recom- ETEREQ-E01,
requirements mendations
ETEREC-E02,
ETEREQ-E03,
ETEREQ-E04,
ETEREQ-E05
3 Communication S Automatic hands-off determination of the communica- ETEREQ-S01,
setup and session tion interface
ETEREQ-S02,
—  hands-free DoCAN protocol initialization
ETEREC-S03,
—  hands-free DoIP protocol initialization and setup
ETEREQ-S04,
initialization
ETEREQ-S05,
  ETEREQ-S06,
ETEREQ-S07,
ETEREQ-S08,
ETEREQ-S09,
ETEREQ-S10,
ETEREQ-S11
4 Diagnostic D Requirements and recommendations related to the ETEREQ-D01,
messages diagnostic messages, like addressing information,
ETEREQ-D02,
sequences, dependencies
ETEREC-D03,
ETEREQ-D04,
ETEREQ-D05,
ETEREQ-D06,
ETEREQ-D07,
ETEREQ-D08
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ISO/FDIS 27145-6:2023(E)
TTaabbllee 22 ((ccoonnttiinnueuedd))
# Main title of Classifier Brief description Related
cluster requirements
and recommen-
dations
  ETEREQ-D09,
ETEREQ-D10,
ETEREQ-D11,
ETEREQ-D12,
ETEREQ-D13,
ETEREQ-D14,
ETEREQ-D15,
ETEREQ-D16,
ETEREQ-D17,
ETEREQ-D18,
ETEREQ-D19,
ETEREQ-D20,
  ETEREQ-D21,
ETEREQ-D22,
ETEREQ-D23,
ETEREQ-D24,
ETEREQ-D25,
ETEREQ-D26,
ETEREQ-D27,
ETEREQ-D28,
ETEREQ-D29,
ETEREQ-D30,
ETEREQ-D31
5 Error handling F Requirements to have a proper communication error ETEREQ-F01,
handling
ETEREQ-F02,
ETEREQ-F03,
ETEREQ-F04
6 Use case specific U Requirements only related to specific use cases ETEREQ-U01,
requirements
ETEREQ-U02,
ETEREQ-U03,
ETEREQ-U04,
ETEREC-U05,
ETEREQ-U06
7 External test equipment requirements
7.1 General
This clause specifies all requirements which are applicable to the external test equipment. The
Introduction, Clause 9, and Clause 10 (respectively use cases 1, 2, and 3 as specified in ISO 27145-1)
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