ISO 22901-2:2011

INTERNATIONAL ISO
STANDARD 22901-2
First edition
2011-07-01
Road vehicles — Open diagnostic data
exchange (ODX) —
Part 2:
Emissions-related diagnostic data
Véhicules routiers — Échange de données de diagnostic ouvert
(ODX) —
Partie 2: Données de diagnostic relatives aux émissions

Reference number
©
ISO 2011
©  ISO 2011
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ii © ISO 2011 – All rights reserved

Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Terms, abbreviated terms and definitions.1
3.1 Terms and definitions .2
3.2 Abbreviated terms .2
4 Conventions.2
5 ODX data in the ECU life cycle.2
6 Emissions-related OBD ODX use cases .3
6.1 Use case 1 — OBD Scan Tool based on a Modular VCI architecture and ODX.3
6.2 Use case 2 — Conversion of emissions-related OBD data to ODX format .4
7 Emissions-related OBD ODX application examples .6
7.1 OBD conformance tester according to SAE J1699-3.6
7.2 Usage of ODX as a configuration for standardized ECU software.7
7.3 Usage of ODX checker rules for ECU development .8
8 Specification release version information.9
8.1 Specification release version location .9
8.2 Specification release version.9
9 OBD authoring in ODX.9
9.1 ODX layering .9
9.2 Service implementation in ODX .13
9.3 ODX PARAMs implementation.17
9.4 Conversion of PIDs to ODX .23
9.5 Conversion of DTCs to ODX.27
9.6 ODX samples of ISO 15031-5 services and authored data.29
Bibliography.72

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 22901-2 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3,
Electrical and electronic equipment.
ISO 22901 consists of the following parts, under the general title Road vehicles — Open diagnostic data
exchange (ODX):
⎯ Part 1: Data model specification
⎯ Part 2: Emissions-related diagnostic data
iv © ISO 2011 – All rights reserved

Introduction
This International Standard has been established in order to define the data format for transferring
standardized emissions-related diagnostic data of the vehicle's OBD system between system supplier, vehicle
manufacturer and service dealerships and diagnostic tools of different vendors.
The standardized information is contained in the following standards:
⎯ Diagnostic protocol information:
⎯ ISO 9141-2:1994, Road vehicles — Diagnostic systems — Part 2: CARB requirements for
interchange of digital information,
⎯ ISO 9141-2:1994/Amd.1:1996, Road vehicles — Diagnostic systems — Part 2: CARB requirements
for interchange of digital information — Amendment 1,
⎯ ISO 14230-4:2000, Road vehicles — Diagnostic systems — Keyword Protocol 2000 — Part 4:
Requirements for emissions-related systems,
⎯ ISO 15765-4, Road vehicles — Diagnostic communication over Controller Area Network (CAN) —
Part 4: Requirements for emissions-related systems,
⎯ SAE J1850, Class B Data Communications Network Interface
⎯ ISO 15031-5, Road vehicles — Communication between vehicle and external equipment for
emissions-related diagnostics — Part 5: Emissions-related diagnostic services;
⎯ Emissions-related OBD data:
⎯ ISO 15031-4, Road vehicles — Communication between vehicle and external equipment for
emissions-related diagnostics — Part 4: External test equipment,
⎯ ISO 15031-5, Road vehicles — Communication between vehicle and external equipment for
emissions-related diagnostics — Part 5: Emissions-related diagnostic services,
⎯ ISO 15031-6, Road vehicles — Communication between vehicle and external test equipment for
emissions-related diagnostics — Part 6: Diagnostic trouble code definitions,
⎯ SAE J1979-DA, Digital Annex of E/E Diagnostic Test Modes,
⎯ SAE J2012-DA, Digital Annex of Diagnostic Trouble Code Definition;
⎯ OBD Conformance test cases:
⎯ SAE J1699-3, OBD II Compliance Test Cases.
The automotive industry mostly utilizes an informal description to document diagnostic data stream
information of vehicle ECUs. Each user, who desires to use the ECU diagnostic data stream documentation to
setup development tools or service diagnostic test equipment, has a requirement for a manual transformation
of this documentation into a format readable by these tools. This effort will no longer be required if the
diagnostic data stream information is provided in ODX format and if those tools support the ODX format.

INTERNATIONAL STANDARD ISO 22901-2:2011(E)

Road vehicles — Open diagnostic data exchange (ODX) —
Part 2:
Emissions-related diagnostic data
1 Scope
This part of ISO 22901 is intended to ensure that diagnostic data stream information is available to diagnostic
tool application manufacturers to simplify the support of the aftermarket automotive service industry. The ODX
modelled diagnostic data are compatible with the software requirements of the Modular Vehicle
Communication Interface (MVCI) (ISO 22900-2 and ISO 22900-3). The ODX modelled diagnostic data can
enable an MVCI device to communicate with the vehicle [ECU(s)] and interpret the diagnostic data contained
in the messages exchanged between the external test equipment and the ECU(s). For ODX-compliant
external test equipment, no software programming is necessary to convert diagnostic data into technician-
readable information for display by the external test equipment.
This part of ISO 22901 contains emissions-related OBD data examples described in ODX. The data examples
derive from ISO 15031 (all parts).
EXAMPLES Diagnostic trouble codes, data parameters, identification data and communication parameters.
The emissions-related OBD ODX modelled diagnostic data describe
⎯ the protocol specification from diagnostic communication of emissions-related ECUs;
⎯ the communication parameters for the emissions-related OBD protocols and data link layers and for
emissions-related ECU software;
⎯ the related vehicle interface description (connectors and pin-out);
⎯ the functional description of diagnostic capabilities of a network of ECUs.
This part of ISO 22901 is based on emissions-related diagnostic data derived and formatted according to the
ISO 15765-4 DoCAN protocol. The definitions and XML representation is exemplary for all other protocols that
are referenced in ISO 15031-5.
2 Normative references
The following referenced documents are indispensable for the application 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 15031 (all parts), Road vehicles — Communication between vehicle and external equipment for
emissions-related diagnostics
ISO 15765-4, Road vehicles — Diagnostic communication over Controller Area Network (CAN) — Part 4:
Requirements for emissions-related systems
ISO 22901-1, Road vehicles — Open diagnostic data exchange (ODX) — Part 1: Data model specification
3 Terms and definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 22901-1 apply.
3.2 Abbreviated terms
MVCI Modular Vehicle Communication Interface
ODX-RT Open Diagnostic data eXchange — Run-Time format
4 Conventions
This part of ISO 22901 is based on the conventions discussed in the OSI Service Conventions
[11]
(ISO/IEC 10731 ) as they apply for diagnostic services.
5 ODX data in the ECU life cycle
Figure 1 shows the usage of ODX in the ECU life cycle. Engineering, manufacturing, and service specify that
communication protocol and data should be implemented in the ECU. This information is documented in a
structured format utilizing the XML standard and by an appropriate ODX authoring tool. There is potential to
generate ECU software from the ODX file. Furthermore, the same ODX file is used to set up the diagnostic
engineering tools to verify proper communication with the ECU and to perform functional verification and
compliance testing. Once all quality goals are met, the ODX file may be released to a diagnostic database.
Diagnostic information is now available to manufacturing, service, OEM franchised dealers and aftermarket
service outlets via Intranet and Internet.

Figure 1 — Usage of ODX data in the ECU life cycle
2 © ISO 2011 – All rights reserved

The objective of this specification is to ensure that diagnostic data from any vehicle manufacturer is
independent of the testing hardware and protocol software supplied by any test equipment manufacturer.
6 Emissions-related OBD ODX use cases
6.1 Use case 1 — OBD Scan Tool based on a Modular VCI architecture and ODX
This use case describes the usage of an OBD scan tool in accordance with ISO 15031-4 / SAE J1978 and
implemented according to the Modular VCI specification (see ISO 22900, parts 1, 2 and 3) and ODX (see
ISO 22901-1).
The benefits of an emissions-related OBD scan tool that is based on the Modular VCI and ODX standard are
the following:
⎯ no software programming to support the implementation of
⎯ new diagnostic trouble codes (see ISO 15031-6 / SAE J2012-DA),
⎯ new PIDs, Test IDs, Monitor IDs, Info Type IDs, and Scaling IDs (see ISO 15031-5 / SAE J1979-DA);
⎯ OBD scan tool applications in accordance with ISO 15031-4 are developed only once and are not
impacted by modifications / changes in the definition of emissions-related OBD data and formats;
⎯ separation of application, communication logic and data items.
NOTE The Modular VCI software architecture supports the emissions-related OBD scan tool requirements as well as
enhanced diagnostic protocols, data streams and applications.
Figure 2 illustrates external test equipment connected to the vehicle's diagnostic connector. The OBD scan
tool's software architecture is compliant to the Modular VCI specifications. The diagnostic kernel is the key
software component o
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