Reference numbe
r
ISO 15765-4:2005(E)
©
ISO 2005
INTERNATIONAL
STANDARD
ISO
15765-4
First edition
2005-01-15
Road vehicles — Diagnostics on
Controller Area Networks (CAN) —
Part 4:
Requirements for emissions-related
systems
Véhicules routiers — Diagnostic sur gestionnaire de réseau de
communication (CAN) —
Partie 4: Exigences applicables aux systèmes associés aux émissions
Copyright International Organization for Standardization
Reproduced by IHS under license with ISO
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ISO 15765-4:2005(E)
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© ISO 2005 – All rights reserved
Copyright International Organization for Standardization
Reproduced by IHS under license with ISO
Not for Resale
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ISO 15765-4:2005(E)
© ISO 2005 – All rights reserved iii
Contents Page
Foreword ............................................................................................................................................................ iv
Introduction ........................................................................................................................................................ v
1 Scope...................................................................................................................................................... 1
2 Normative references ........................................................................................................................... 1
3 Terms, definitions, symbols and abbreviated terms ......................................................................... 1
4 External test equipment initialization sequence................................................................................ 2
4.1 General ................................................................................................................................................... 2
4.2 11 bit CAN identifier verification procedure....................................................................................... 4
4.2.1 Request message transmit procedure................................................................................................ 4
4.2.2 Response handling procedure ............................................................................................................ 5
4.3 29 bit CAN identifier verification procedure....................................................................................... 7
4.3.1 Request message transmit procedure................................................................................................ 7
4.3.2 Response handling procedure ............................................................................................................ 8
5 Session layer ......................................................................................................................................... 9
6 Network layer....................................................................................................................................... 10
6.1 General ................................................................................................................................................. 10
6.2 Addressing formats ............................................................................................................................ 10
6.3 Data link layer interface...................................................................................................................... 10
6.3.1 CAN identifier requirements .............................................................................................................. 10
6.3.2 Mapping of diagnostic addresses ..................................................................................................... 10
6.4 Network layer parameters .................................................................................................................. 13
6.4.1 Network layer timing parameter values ............................................................................................ 13
6.4.2 Definition of external test equipment network layer parameter values ........................................ 13
6.4.3 Maximum number of legislated-OBD ECUs ..................................................................................... 14
7 Data link layer ...................................................................................................................................... 14
8 Physical layer ...................................................................................................................................... 14
8.1 General ................................................................................................................................................. 14
8.2 External test equipment baudrates ................................................................................................... 14
8.3 External test equipment CAN bit timing ........................................................................................... 15
8.3.1 CAN bit timing parameter values ...................................................................................................... 15
8.3.2 Nominal baudrate 250 kBit/s .............................................................................................................. 16
8.3.3 Nominal baudrate 500 kBit/s .............................................................................................................. 17
8.4 External test equipment ..................................................................................................................... 17
8.4.1 General ................................................................................................................................................. 17
8.4.2 CAN interface ...................................................................................................................................... 18
8.4.3 External-test-equipment cable........................................................................................................... 20
Bibliography ..................................................................................................................................................... 21
Copyright International Organization for Standardization
Reproduced by IHS under license with ISO
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ISO 15765-4:2005(E)
iv © ISO 2005 – All rights reserved
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 15765-4 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3,
Electrical and electronic equipment.
ISO 15765 consists of the following parts, under the general title Road vehicles — Diagnostics on Controller
Area Networks (CAN):
Part 1: General information
Part 2: Network layer services
Part 3: Implementation of unified diagnostic services (UDS on CAN)
Part 4: Requirements for emissions-related systems
Copyright International Organization for Standardization
Reproduced by IHS under license with ISO
Not for Resale
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ISO 15765-4:2005(E)
© ISO 2005 – All rights reserved v
Introduction
This part of ISO 15765 has been established in order to define common requirements for vehicle diagnostic
systems implemented on a Controller Area Network (CAN) communication link, as specified in ISO 11898.
Although primarily intended for diagnostic systems, it also meets requirements from other CAN-based
systems needing a network layer protocol.
To achieve this, it is based on the Open Systems Interconnection (OSI) Basic Reference Model specified in
ISO/IEC 7498 and ISO/IEC 10731, which structures communication systems into seven layers. When mapped
on this model, the services specified by ISO 15765 are divided into
unified diagnostic services (layer 7), specified in ISO 15765-3,
network layer services (layer 3), specified in ISO 15765-2,
CAN services (layers 1 and 2), specified in ISO 11898,
in accordance with Table 1.
The application layer services covered by ISO 15765-3 have been defined in compliance with diagnostic
services established in ISO 14229-1 and ISO 15031-5, but are not limited to use only with them. ISO 15765-3
is also compatible with most diagnostic services defined in national standards or vehicle manufacturer's
specifications.
The network layer services covered by ISO 15765-2 have been defined to be independent of the physical
layer implemented, and a physical layer is only specified for legislated OBD.
For other application areas, ISO 15765 can be used with any CAN physical layer.
Table 1 — Enhanced and legislated-OBD diagnostic specifications applicable to the OSI layers
Open Systems Interconnection
(OSI) layers
Vehicle manufacturer enhanced
diagnostics
Legislated on-board diagnostics
(OBD)
Diagnostic application User defined ISO 15031-5
Application layer ISO 15765-3 ISO 15031-5
Presentation layer N/A N/A
Session layer ISO 15765-3 N/A
Transport layer N/A N/A
Network layer ISO 15765-2 ISO 15765-4
Data link layer ISO 11898-1 ISO 15765-4
Physical layer User defined ISO 15765-4
Copyright International Organization for Standardization
Reproduced by IHS under license with ISO
Not for Resale
No reproduction or networking permitted without license from IHS
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