ISO 14229-3:2012

DRAFT INTERNATIONAL STANDARD ISO/DIS14229-3
ISO/TC 22/SC 3 Secretariat: DIN
Voting begins on Voting terminates on

2011-07-01 2011-12-01
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION  •  МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ  •  ORGANISATION INTERNATIONALE DE NORMALISATION


Road vehicles — Unified diagnostic services (UDS —
Part 3:
Unified diagnostic services on CAN implementation
(UDSonCAN)
Véhicules routiers — Services de diagnostic unifiés (SDU) —
Partie 3: SDU sur l'implémentation du gestionnaire de réseau de communication (SDUsurCAN)
ICS 43.180








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©  International Organization for Standardization, 2011

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ISO/DIS 14229-3

Copyright notice
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ii © ISO 2011 – All rights reserved

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ISO/DIS 14229-3
Contents Page
Foreword . iv
Introduction . v
1  Scope . 1
2  Normative references . 1
3  Terms, definitions, symbols and abbreviated terms . 2
3.1  Terms and definitions . 2
3.2  Abbreviated terms . 2
4  Conventions . 2
5  Document overview . 3
6  Unified diagnostic services implementation on CAN . 4
6.1  General . 4
6.2  UDS on CAN services overview . 4
6.3  ResponseOnEvent (0x86) service DoCAN implementation requirements . 5
6.4  ReadDataByPeriodicIdentifier (0x2A) service DoCAN implementation requirements . 7
7  Application layer requirements . 13
7.1  Application layer services . 13
7.2  Application layer protocol . 13
7.3  Timing definition . 13
8  Presentation layer requirements . 13
9  Session layer requirements . 13
10  Transport/Network layer interface adaptation . 14
10.1  General information . 14
10.2  DoCAN Transport/Network layer interface adaptation . 14
11  Data link layer diagnostic implementation requirements . 16
11.1  Usage of legislated 11-bit OBD CAN Identifiers for enhanced diagnostics . 16
11.2  Usage of legislated 29-bit OBD CAN Identifiers for enhanced diagnostics . 16
Annex A (informative) UDSonCAN / LIN-Master gateway . 17
A.1  UDSonCAN to LIN gateway definition . 17
A.2  UDSonCAN gateway / LIN-Master to LIN-Slave message example . 17
Bibliography . 18

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ISO/DIS 14229-3
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 14229-3 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3,
Electrical and electronic equipment.
This first edition cancels and replaces the first edition ISO 15765-3:2004, of which has been technically
revised.
ISO 14229 consists of the following parts, under the general title Road vehicles — Unified diagnostic services
(UDS):
⎯ Part 1: Specification and requirements
⎯ Part 2: Session layer services
⎯ Part 3: Unified diagnostic services on CAN implementation (UDSonCAN)
⎯ Part 4: Unified diagnostic services on FlexRay implementation (UDSonFR)
⎯ Part 5: Unified diagnostic services on Internet Protocol implementation (UDSonIP)
The following parts are under preparation / are planned:
⎯ Part 6: Unified diagnostic services on K-Line implementation (UDSonK-Line)
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ISO/DIS 14229-3
Introduction
This part of ISO 14229 has been established in order to enable the implementation of unified diagnostic
services, as specified in ISO 14229-1, on Controller Area Networks (UDS on CAN).
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 14229 are divided into
⎯ Application layer (layer 7), specified in ISO 14229-1, ISO/DIS 14229-3;
⎯ Presentation layer (layer 6), vehicle manufacturer specific;
⎯ Session layer services (layer 5), specified in ISO 14229-2;
⎯ Transport layer services (layer 4), specified in ISO 15765-2, ISO 15765-4;
⎯ Network layer services (layer 3), specified in ISO 15765-2, ISO 15765-4;
⎯ Data link layer (layer 2), specified in ISO 11898-1, ISO 11898-2, ISO 11898-3, ISO 11898-5;
⎯ Physical layer (layer 1), specified in ISO 11898-1, ISO 11898-2, ISO 11898-3, ISO 11898-5;
in accordance with Table 1.
Table 1 — DoCAN enhanced diagnostics, legislated OBD and WWH-OBD specification reference
applicable to the OSI layers
Legislated OBD
Vehicle manufacturer Legislated WWH-OBD
Applicability OSI 7 layers (On-Board
enhanced diagnostics (On-Board Diagnostics)
Diagnostics)
ISO 14229-1,
Application (layer 7) ISO 15031-5 ISO 14229-1, ISO 27145-3
ISO/DIS 14229-3
SAE J1930-DA, SAE J1930-DA, SAE J1979 DA,
vehicle manufacturer
Presentation (layer 6) SAE J1979-DA, SAE J2012-DA, SAE J1939 Appendix C
specific
SAE J2012-DA (SPNs), SAE J1939-73 Appendix A (FMIs)
Seven layer
according to
Session (layer 5) ISO 14229-2
ISO 7498-1
and
Transport (layer 4)
ISO15765-4, ISO15765-4,
ISO/IEC
ISO 15765-2 ISO 13400-2
ISO15765-2 ISO15765-2
10731
Network (layer 3)
ISO
Data link (layer 2) ISO 11898-1,
27145-4
ISO 15765-4, ISO 15765-4,
ISO 11898-2, ISO 13400-3,
ISO 11898-1, ISO 11898-1,
ISO 11898-3, IEEE 802.3
Physical (layer 1)
ISO 11898-2 ISO 11898-2
ISO 11898-5

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DRAFT INTERNATIONAL STANDARD ISO/DIS 14229-3

Road vehicles — Unified diagnostic services (UDS —
Part 3:
Unified diagnostic services on CAN implementation
(UDSonCAN)
1 Scope
This part of ISO 14229 specifies the implementation of a common set of unified diagnostic services (UDS) on
controller area networks (CAN) in road vehicles (UDSonCAN).
UDSonCAN references Part°1 and Part°2 of ISO 14229 and specifies implementation requirements of the
diagnostic services to be used for diagnostic communication over CAN.
NOTE UDSonCAN does not specify any requirement for the in-vehicle CAN bus architecture.
This part of ISO 14229 does not include any redundant information of the documents as listed in the
Introduction. It focuses on
⎯ additional requirements specific to the implementation of UDS on the CAN network, and
⎯ specific restrictions in the implementation of UDS on the CAN network.
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 11898-1, Road vehicles — Controller area network (CAN) — Part 1: Data link layer and physical
signalling
ISO 11898-2, Road vehicles — Controller area network (CAN) — Part 2: High-speed medium access unit
ISO 14229-1, Road vehicles — Unified diagnostic services (UDS) — Part 1: Specification and requirements
ISO 14229-2, Road vehicles — Unified diagnostic services (UDS) — Part 2: Session layer services
ISO 15765-1, Road vehicles — Diagnostic communication over controller area network (DoCAN) — Part 1:
General information and use case definition
ISO 15765-2, Road vehicles — Diagnostic communication over controller area network (DoCAN) — Part 2:
Transport protocol and Network layer services
ISO 15765-4, Road vehicles — Diagnostic communication over controller area network (DoCAN) — Part 4:
Requirements for emissions-related systems
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ISO/DIS 14229-3
3 Terms, definitions, symbols and abbreviated terms
3.1  Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14229-1, ISO 14229-2,
ISO 15765-1, ISO 15765-2 and ISO 15765-4 apply.
3.2  Abbreviated terms
CF consecutive frame
DA destination address
DLC data length code
FF first frame
FC flow control
ID identifier
NA network address
SA source address
SF single frame
SM subnet mask
SOM start of message
STRT serviceToRespondTo
TA target address
UDS unified diagnostic services
USDT unacknowledged segmented data transfer
UUDT unacknowledged unsegmented data transfer
4 Conventions
This part of ISO 14229 is based on the conventions discussed in the OSI Service Conventions
(ISO/IEC 10731:1994) as they apply for diagnostic services.
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ISO/DIS 14229-3
5 Document overview
Figure 1 illustrates the documents required to implement UDSonCAN.

Figure 1 — UDSonCAN document reference according to OSI model
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ISO/DIS 14229-3
6 Unified diagnostic services implementation on CAN
6.1  General
This clause defines how the diagnostic services as defined in ISO 14229-1 apply to DoCAN. For each
applicable service, the applicable subfunction and data parameters are defined.
NOTE The subfunction parameter definitions take into account that the most significant bit is used for the
suppressPosRspMsgIndicationBit parameter as defined in ISO 14229-1.
6.2 UDS on CAN services overview
The purpose of Table 2 is to reference all ISO 14229-1 and ISO 14229-2 services as they are applicable for
an implementation in ISO 14229-3 UDSonCAN. Table 2 contains the sum of all applicable services. Certain
applications using this part of ISO 14229 to implement UDSonCAN may restrict the number of useable
services and may categorize them in certain application areas/diagnostic sessions (default session,
programming session, etc.).
Services in Table 2 that are marked "No CAN specific requirements" shall be implemented as defined in
ISO 14229-1 and ISO 14229-2 with no additional restrictions. Services that are marked "CAN specific
requirements" shall be implemented as defined by the subclause listed in the Table 2 entry.
Table 2 — Overview of applicable ISO 14229-1 Unified diagnostic services and data ranges
Diagnostic service name Reference in this
Comment
(ISO 14229-1) document
Diagnostic and Communication Management Functional Unit
DiagnosticSessionControl No CAN specific requirements ---
ECUReset No CAN specific requirements ---
SecurityAccess No CAN specific requirements ---
CommunicationControl No CAN specific requirements ---
TesterPresent No CAN specific requirements ---
SecuredData-Transmission No CAN specific requirements ---
ControlDTCSetting No CAN specific requirements ---
ResponseOnEvent CAN specific requirements see 6.3
LinkControl No CAN specific requirements ---
Data Transmission Functional Unit
ReadDataByIdentifier No CAN specific requirements ---
ReadMemoryByAddress No CAN specific requirements ---
ReadScalingDataByIdentifier No CAN specific requirements ---
ReadDataByPeriodicIdentifier CAN specific requirements see 6.4
DynamicallyDefineDataIdentifier CAN specific requirements ---
WriteDataByIdentifier No CAN specific requirements ---
WriteMemoryByAddress No CAN specific requirements ---

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ISO/DIS 14229-3
Table 2 — (continued)
Data Transmission Functional Unit
ReadDTCInformation No CAN specific requirements ---
ClearDiagnosticInformation No CAN specific requirements ---
Input/Output Control Functional Unit
InputOutputControlByIdentifier No CAN specific requirements ---
Remote Activation Of Routine Functional Unit
RoutineControl No CAN specific requirements ---
Upload/Download Functional Unit
RequestDownload No CAN specific requirements ---
RequestUpload No CAN specific requirements ---
TransferData No CAN specific requirements ---
RequestTransferExit No CAN specific requirements ---

6.3 ResponseOnEvent (0x86) service DoCAN implementation requirements
In addition to the generic implementation requirements stated in ISO 14229-1 the following additional CAN
specific implementation requirements shall apply:
a) While the ResponseOnEvent service is active, the server shall be able to process concurrent diagnostic
request and response messages accordingly. This should be accomplished with a different
serviceToRespondTo CAN Identifiers. If the same diagnostic request/response CAN Identifiers are used
for diagnostic communication and the serviceToRespondTo-responses, the following restrictions shall
apply, see Figure 2:
1) The server may ignore an incoming diagnostic request issued by the client that initiated the event,
after an event has occurred and the serviceToRespondTo-response is in progress, until the
serviceToRespondTo-response is completed. If another client issued the request, the server may or
may not ignore the request, depending on the server’s capabilities.
2) When the client receives any response after sending a diagnostic request, the response shall be
classified according to the possible serviceToRespondTo-responses and the expected diagnostic
responses to the previously sent request.
i) If the response is a serviceToRespondTo-response (one of the possible responses set up with
ResponseOnEvent-service), the client shall repeat the request after the serviceToRespondTo-
response has been received completely.
ii) If the response is ambiguous (i.e. the response could originate from the serviceToRespondTo
initiated by an event or from the response to a diagnostic request), the client shall present the
response both as a serviceToRespondTo-response and as the response to the diagnostic
request. The client shall not repeat the request with the exception of NegativeResponseCode
busyRepeatRequest (0x21) (see the negative response code definitions in ISO 14229-1).
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ISO/DIS 14229-3
client server
STRT-ResponseFF
SF-Diag-Request Event
server ignores request
STRT-FC
STRT-CF
STRT-CF
the STRT-response is completed
and the tester repeats the
diagnostic request, if the
response is a valid STRT-
SF-Diag-Request
response.
server responds to request
Response

Figure 2 — Concurrent request when the event occurs

b) When the specified event is detected, the server shall respond immediately with the appropriate
serviceToRespondTo-response message. The immediate serviceToRespondTo-response message shall
not disrupt any other diagnostic request or response transmission already in progress (i.e. the
serviceToRespondTo-response shall be delayed until the current message transmission has been
completed — see Figure 3.

Figure 3 — Event occurrence during a message in progress
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ISO/DIS 14229-3
6.4 ReadDataByPeriodicIdentifier (0x2A) service DoCAN implementation requirements
6.4.1 Response Message Type - UUDT
The ReadDataByPeriodicIdentifier service allows the client to request the periodic transmission of data record
values from the server identified by one or more periodicDataIdentifiers. For service 0x2A implementation on
DoCAN, the response message type #2 (UUDT) format shall be supported according to ISO 14229-1.
1)
Response message type #2 (UUDT) is mapped onto a UUDT message, using a different CAN identifier as
used for the USDT response message. The UUDT message for a single periodicDataIdent
...