ISO 15031-5:2015
(Main)Road vehicles — Communication between vehicle and external equipment for emissions-related diagnostics — Part 5: Emissions-related diagnostic services
Road vehicles — Communication between vehicle and external equipment for emissions-related diagnostics — Part 5: Emissions-related diagnostic services
ISO 15031-5:2015 is intended to satisfy the data reporting requirements of On-Board Diagnostic (OBD) regulations in the United States and Europe and any other region that may adopt similar requirements in the future. It specifies: message formats for request and response messages, timing requirements between request messages from external test equipment and response messages from vehicles and between those messages and subsequent request messages, behaviour of both the vehicle and external test equipment if data are not available, and a set of diagnostic services, with corresponding content of request and response messages, to satisfy OBD regulations. ISO 15031-5:2015 includes capabilities required to satisfy OBD requirements for multiple regions, model years, engine types, and vehicle types. Those regulations are not yet final for some regions and are expected to change in the future. ISO 15031-5:2015 makes no attempt to interpret the regulations and does not include applicability of the included diagnostic services and data parameters for various vehicle applications. The user of ISO 15031-5:2015 is responsible for verifying the applicability of each clause of this part of ISO 15031 for a specific vehicle, engine, model year, and region. ISO 15031-5:2015 specifies diagnostic services and functionally addressed request/response messages required to be supported by motor vehicles and external test equipment for diagnostic purposes which pertain to motor vehicle emission-related data. Any external test equipment meeting the requirements of ISO 15031‑4 use these messages to retrieve emissions-related information from the vehicle. Each clause in ISO 15031-5:2015 which specifies additional details to existing clauses of ISO 9141‑2, ISO 14230‑4, SAE J1850, and ISO 15765‑4 supersede those specifications. ISO 15031-5:2015 references SAE J1979-DA (Digital Annex), which includes all definitions of PIDs, OBDMIDs, TIDs, and INFOTYPEs. ISO 15031-5:2015 provides the mechanism to satisfy the requirements included in the country-specific regulations and not all capabilities included in ISO 15031-5:2015 are required by the country-specific regulations. ISO 15031-5:2015 is not considered a final authority for interpretation of the regulations. Therefore, readers should determine the applicability of capabilities defined in ISO 15031-5:2015 for their own specific needs.
Véhicules routiers — Communications entre un véhicule et un équipement externe pour le diagnostic relatif aux émissions — Partie 5: Services de diagnostic relatif aux émissions
General Information
Relations
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 15031-5
Third edition
2015-08-01
Road vehicles — Communication
between vehicle and external
equipment for emissions-related
diagnostics —
Part 5:
Emissions-related diagnostic services
Véhicules routiers — Communications entre un véhicule et un
équipement externe pour le diagnostic relatif aux émissions —
Partie 5: Services de diagnostic relatif aux émissions
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved
Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, and abbreviated terms . 2
3.1 Terms and definitions . 2
3.2 Abbreviated terms . 4
4 Conventions . 6
5 Document overview. 6
6 Technical requirements . 6
6.1 General requirements . 6
6.2 Diagnostic service requirements . 6
6.2.1 Multiple responses to a single data request . 6
6.2.2 Application timing parameter definition . 7
6.2.3 Minimum time between requests from external test equipment .18
6.2.4 Data not available .26
6.2.5 Maximum values .36
6.2.6 Invalid signals .36
6.3 Diagnostic message format .36
6.3.1 Addressing method . .36
6.3.2 Maximum message length .37
6.3.3 Request/Response message format .37
6.3.4 Response code parameter definition .38
6.3.5 Header byte definition of ISO 9141-2, ISO 14230-4, and SAE J1850 .39
6.3.6 Header byte definition of ISO 15765-4 .40
6.3.7 Data bytes definition of ISO 9141-2, ISO 14230-4, SAE J1850, and ISO 15765-4 .40
6.3.8 Non-data bytes included in diagnostic messages with SAE J1850 .40
6.3.9 Non-data bytes included in diagnostic messages with ISO 9141-2 and
ISO 14230-4 .41
6.4 Byte order convention .41
6.5 Allowance for expansion and enhanced diagnostic services .41
6.6 Definition of PIDs for services 01 and 02 .
16 16 41
6.7 Format of data to be displayed .41
7 Diagnostic service definition for ISO 9141-2, ISO 14230-4, and SAE J1850 .42
7.1 Service 01 — Request current powertrain diagnostic data .42
7.1.1 Functional description .42
7.1.2 Message data bytes .42
7.1.3 Parameter definition .43
7.1.4 Message example .44
7.2 Service 02 — Request powertrain freeze frame data .47
7.2.1 Functional description .47
7.2.2 Message data bytes .48
7.2.3 Parameter definition .49
7.2.4 Message example .49
7.3 Service 03 — Request emission-related diagnostic trouble codes .51
7.3.1 Functional description .51
7.3.2 Message data bytes .52
7.3.3 Parameter definition .53
7.3.4 Message example .53
7.4 Service 04 — Clear/reset emission-related diagnostic information .56
7.4.1 Functional description .56
7.4.2 Message data bytes .56
7.4.3 Parameter definition .57
7.4.4 Message example .57
7.5 Service 05 — Request oxygen sensor monitoring test results .58
7.5.1 Functional description .58
7.5.2 Message data bytes .58
7.5.3 Parameter definition .59
7.5.4 Message example .61
7.6 Service 06 — Request On-board monitoring test results for specific
monitored systems .63
7.6.1 Functional description .63
7.6.2 Message data bytes .64
7.6.3 Parameter definition .65
7.6.4 Message example .66
7.7 Service 07 — Request emission-related diagnostic trouble codes detected
during current or last completed driving cycle .68
7.7.1 Functional description .68
7.7.2 Message data bytes .68
7.7.3 Parameter definition .69
7.7.4 Message example .69
7.8 Service 08 — Request control of on-board system, test, or component .69
7.8.1 Functional description .69
7.8.2 Message data bytes .69
7.8.3 Parameter definition .71
7.8.4 Message example .71
7.9 Service 09 — Request vehicle information .72
7.9.1 Functional description .72
7.9.2 Message data bytes .72
7.9.3 Parameter definition .73
7.9.4 Message example .74
8 Diagnostic service definition for ISO 15765-4 .91
8.1 Service 01 — Request current powertrain diagnostic data .91
8.1.1 Functional description .91
8.1.2 Message data bytes .92
8.1.3 Parameter definition .94
8.1.4 Message example .94
8.2 Service 02 — Request powertrain freeze frame data .97
8.2.1 Functional description .97
8.2.2 Message data bytes .98
8.2.3 Parameter definition .100
8.2.4 Message example .100
8.3 Service 03 — Request emission-related diagnostic trouble codes .103
8.3.1 Functional description .103
8.3.2 Message data bytes .104
8.3.3 Parameter definition .104
8.3.4 Message example .104
8.4 Service 04 — Clear/Reset emission-related diagnostic information .106
8.4.1 Functional description .106
8.4.2 Message data bytes .107
8.4.3 Parameter definition .107
8.4.4 Message example .107
8.5 Service 05 — Request oxygen sensor monitoring test results .108
8.6 Service 06 — Request on-board monitoring test results for specific
monitored systems .108
8.6.1 Functional description .108
8.6.2 Message data bytes .109
8.6.3 Parameter definition .112
8.6.4 Message example .117
iv © ISO 2015 – All rights reserved
8.7 Service 07 — Request emission-related diagnostic trouble codes detected
during current or last completed driving cycle .119
8.7.1 Functional description .119
8.7.2 Message data bytes .120
8.7.3 Parameter definition .120
8.7.4 Message example .120
8.8 Service 08 — Request control of on-board system, test, or component .120
8.8.1 Functional description .120
8.8.2 Message data bytes .121
8.8.3 Parameter definition .123
8.8.4 Message example .123
8.9 Service 09 — Request vehicle information .124
8.9.1 Functional description .124
8.9.2 Message data bytes .125
8.9.3 Parameter definition .126
8.9.4 Message example .127
8.10 Service 0A — Request emission-related diagnostic trouble codes with
permanent status .138
8.10.1 Functional description .138
8.10.2 Message data bytes .139
8.10.3 Parameter definition .139
8.10.4 Message example .139
Bibliography .140
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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 31, Data
communication.
This third edition cancels and replaces the second edition (ISO 15031-5:2011), which has been
technically revised.
ISO 15031 consists of the following parts, under the general title Road vehicles — Communication
between vehicle and external equipment for emissions-related diagnostics:
— Part 1: General information and use case definition
— Part 2: Guidance on terms, definitions, abbreviations and acronyms
— Part 3: Diagnostic connector and related electrical circuits, specification and use
— Part 4: External test equipment
— Part 5: Emissions-related diagnostic services
— Part 6: Diagnostic trouble code definitions
— Part 7: Data link security
vi © ISO 2015 – All rights reserved
Introduction
Overview
ISO 15031 consists of a number of parts which, taken together, provide a coherent self-consistent set of
specifications to facilitate emissions-related diagnostics. ISO 15031-1 provides an introduction to the
series of International Standards. ISO 15031-2 through ISO 15031-7 are based on SAE recommended
practices. This part of ISO 15031 is based on SAE J1979.
This International Standard includes the communication between the vehicle’s On-Board Diagnostic
(OBD) systems and test equipment implemented across vehicles within the scope of the legislated
emissions-related OBD.
To achieve this, it is based on the Open Systems Interconnection (OSI) Basic Reference Model in
accordance with 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 International Standard are
broken into the following layers in accordance with Table 1.
— Diagnostic services (layer 7), specified in the following:
— this part of ISO 15031;
— ISO 27145-3 (WWH-OBD).
— Presentation layer (layer 6), specified in the following:
— ISO 15031-2, SAE J1930-DA;
— this part of ISO 15031, SAE J1979-DA;
— ISO 15031-6, SAE J2012-DA;
— ISO 27145-2, SAE J2012-DA.
— Session layer services (layer 5), specified in the following:
— ISO 14229-2 supports ISO 15765-4 DoCAN and ISO 14230-4 DoK-Line protocols;
— ISO 14229-2 is not applicable to the SAE J1850 and ISO 9141-2 protocols.
— Transport layer services (layer 4), specified in the following:
— ISO 15765-2;
— SAE J1850 defined in this part of ISO 15031;
— ISO 9141-2 defined in this part of ISO 15031;
— ISO 14230-4, defined in this part of ISO 15031.
— Network layer services (layer 3), specified in the following:
— ISO 15765-2;
— SAE J1850 defined in this part of ISO 15031;
— ISO 9141-2 defined in this part of ISO 15031;
— ISO 14230-4 defined in this part of ISO 15031.
— Data link layer (layer 2), specified in the following:
— ISO 15765-4, ISO 11898-1, and ISO 11898-2;
— SAE J1850;
— ISO 9141-2;
— ISO 14230-2.
— Physical layer (layer 1), specified in the following:
— ISO 15765-4, ISO 11898-1, and ISO 11898-2;
— SAE J1850;
— ISO 9141-2;
— ISO 14230-1.
a
Table 1 — Legislated emissions-related OBD/WWH-OBD diagnostic specifications applicable
to the OSI layers
Emissions-related OBD communication Emissions-related WWH-OBD
Applicability OSI 7 layers
requirements communication requirements
Application
ISO 15031-5/SAE J1979 ISO 27145-3
(layer 7)
ISO 15031-2, ISO 15031-5, ISO 15031-6 ISO 27145-2
Presentation
SAE J1930-DA, SAE J1979-DA,
(layer 6)
SAE J1930-DA, SAE J1979-DA, SAE J2012-DA
SAE J2012-DA
Seven layers
Session
according to
Not applicable ISO 14229-2
(layer 5)
ISO/IEC
7498-1
Transport
and
(layer 4)
ISO ISO ISO ISO
ISO/IEC
ISO 15031-5
14230-4 15765-2 15765-2 13400-2
Network
(layer 3)
ISO ISO
15765-4 15765-4
Data link ISO
ISO ISO
(layer 2) 14230-2
SAE ISO 11898-1, 11898-1, ISO
J1850 9141-2 ISO ISO 13400-3
Physical ISO
11898-2 11898-2
(layer 1) 14230-1
a
World-Wide Harmonized.
SAE document reference concept
ISO 15031 references several SAE documents which contain all terms, data, and DTC (diagnostic trouble
code) definitions. This is illustrated in Figure 1.
Additional information on the content of the referenced documents is given below:
— SAE J1930: the document is concerned with a procedure for naming objects and systems and
with the set of words from which names are built. It references SAE J1930-DA which contains all
standardized naming objects, terms, and abbreviations.
— SAE J1979: the document is concerned with the definition of emissions-related diagnostic services
(diagnostic test modes). It references SAE J1979-DA which contains all standardized data items such
as PIDs, Test IDs, Monitor IDs, and INFOTYPE IDs.
— SAE J2012: the document is concerned with the procedure for defining emissions-related DTCs. It
references SAE J2012-DA which contains all standardized data items such as DTCs and FTBs (failure
type bytes).
viii © ISO 2015 – All rights reserved
Key
1 SAE Digital Annexes
Figure 1 — SAE Digital Annex document reference
OBD regulations require passenger cars and light, medium, and heavy duty trucks to support a
minimum set of diagnostic information to external (off-board) “generic” test equipment.
SAE J1979-DA (OBD) Digital Annex
This part of ISO 15031 references SAE J1979-DA. SAE J1979-DA is concerned with the definition of the
following:
— Parameter Identifiers (PIDs);
— Test IDentifiers (TIDs);
— OBD Monitor Identifiers (OBDMIDs);
— Unit and Scaling Identifiers (UASIDs);
— INFOTYPEs (INFOTYPEs).
SAE Digital Annex revision procedure
New emissions-related regulatory requirements drive new in-vehicle technology to lower emissions.
New technology-related OBD monitor data and DTCs need to be standardized to support the external
(off-board) “generic” test equipment. All relevant information is proposed by the automotive industry
represented by members of the appropriate SAE task force.
The revision request form and instructions for updating the registers to this part of ISO 15031 can be
obtained on the Registration Authority’s website at:
http://www.sae.org/servlets/works/committeeHome.do?comtID=TEVDS14
The column titled “Resources” shows a document with the title: J1979-DA_Revision_Request_Form.doc.
Double click on the name and you will be asked to download the document with the file name:
SAE_J1979-DA_Revision_Request_Form.doc
Fill out the revision request form with your request.
Please send an e-mail with the completed revision request form as an attachment to:
SAE Headquarters
755 West Big Beaver Road
Suite 1600
Troy, MI 48084-4093, USA
Fax: +1 (248) 273-2494
Email: saej1979@sae.org
x © ISO 2015 – All rights reserved
INTERNATIONAL STANDARD ISO 15031-5:2015(E)
Road vehicles — Communication between vehicle and
external equipment for emissions-related diagnostics —
Part 5:
Emissions-related diagnostic services
1 Scope
This part of ISO 15031 is intended to satisfy the data reporting requirements of On-Board Diagnostic
(OBD) regulations in the United States and Europe and any other region that may adopt similar
requirements in the future. This part of ISO 15031 specifies
a) message formats for request and response messages,
b) timing requirements between request messages from external test equipment and response
messages from vehicles and between those messages and subsequent request messages,
c) behaviour of both the vehicle and external test equipment if data are not available, and
d) a set of diagnostic services, with corresponding content of request and response messages, to
satisfy OBD regulations.
This part of ISO 15031 includes capabilities required to satisfy OBD requirements for multiple regions,
model years, engine types, and vehicle types. Those regulations are not yet final for some regions and are
expected to change in the future. This part of ISO 15031 makes no attempt to interpret the regulations
and does not include applicability of the included diagnostic services and data parameters for various
vehicle applications. The user of this part of ISO 15031 is responsible for verifying the applicability of
each clause of this part of ISO 15031 for a specific vehicle, engine, model year, and region.
This part of ISO 15031 specifies diagnostic services and functionally addressed request/response
messages required to be supported by motor vehicles and external test equipment for diagnostic
purposes which pertain to motor vehicle emission-related data. Any external test equipment meeting
the requirements of ISO 15031-4 use these messages to retrieve emissions-related information from
the vehicle.
Each clause in this part of ISO 15031 which specifies additional details to existing clauses of ISO 9141-2,
ISO 14230-4, SAE J1850, and ISO 15765-4 supersede those specifications.
This part of ISO 15031 references SAE J1979-DA (Digital Annex), which includes all definitions of PIDs,
OBDMIDs, TIDs, and INFOTYPEs.
This part of ISO 15031 provides the mechanism to satisfy the requirements included in the country-
specific regulations and not all capabilities included in this part of ISO 15031 are required by the
country-specific regulations. This part of ISO 15031 is not considered a final authority for interpretation
of the regulations. Therefore, readers should determine the applicability of capabilities defined in this
part of ISO 15031 for their own specific needs.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 9141-2:1994, Road vehicles — Diagnostic systems — Part 2: CARB requirements for interchange of
digital information
ISO 14229-2, Road vehicles — Unified diagnostic services (UDS) — Part 2: Session layer services
ISO 14230-2, Road vehicles — Diagnostic communication over K-Line (DoK-Line) — Part 2: Data link layer
ISO 14230-4:2000, Road vehicles — Diagnostic systems — Keyword Protocol 2000 — Part 4: Requirements
for emission-related systems
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
ISO 15031-2, Road vehicles — Communication between vehicle and external equipment for emissions-
related diagnostics — Part 2: Guidance on terms, definitions, abbreviations and acronyms
SAE J1930-DA, Digital Annex of Electrical/Electronic Systems Diagnostic Terms, Definitions, Abbreviations,
and Acronyms
SAE J1979-DA, Digital Annex of E/E Diagnostic Test Modes
SAE J2012-DA, Digital Annex of Diagnostic Trouble Code Definitions and Failure Type Byte Definitions
3 Terms, definitions, and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14229-2, ISO 14230-2,
ISO 15031-2, and ISO 15765-2 and the following apply.
3.1.1
absolute throttle position sensor
value intended to represent the throttle opening
Note 1 to entry: For systems where the output is proportional to the input voltage, this value is the percent of
maximum input signal. For systems where the output is inversely proportional to the input voltage, this value is
100 % minus the percent of maximum input signal. Throttle position at idle usually indicates greater than 0 %
and throttle position at wide open throttle usually indicates less than 100 %.
3.1.2
bank
specific group of cylinders sharing a common control sensor
Note 1 to entry: Bank 1 always contains cylinder number 1 and bank 2 the opposite bank.
Note 2 to entry: If there is only one bank, the DTCs for bank #1 DTCs are used and the word bank may be omitted.
With a single “bank” system utilizing multiple sensors, bank #1 DTCs are used in identifying the sensors as #1,
#2, and #3 in order as they move further away from the cylinder.
3.1.3
base fuel schedule
fuel calibration schedule programmed into the powertrain control module or PROM when manufactured
or when updated by an off-board source, prior to any learned on-board correction
2 © ISO 2015 – All rights reserved
3.1.4
calculated load value
〈spark ignition vehicles〉 typically an indication of the current airflow divided by peak airflow at wide
open throttle as a function of rpm, where airflow is corrected for altitude and ambient temperature
Note 1 to entry: Both spark ignition and compression ignition vehicles can use an alternate definition that
substitutes engine torque in place of airflow in the calculation.
Note 2 to entry: This definition provides a number (without unit) and provides the service technician with an
indication of the percent engine capacity that is being used.
3.1.5
client
function that is part of the tester and that makes use of the diagnostic services
Note 1 to entry: A tester normally makes use of other functions such as database management, specific
interpretation, and man-machine interface.
3.1.6
continuous monitoring
sampling at a rate no fewer than two samples per second
Note 1 to entry: If, for control purposes, a computer input is sampled less frequently, the signal of the component
may instead be evaluated each time sampling occurs.
3.1.7
convention
Cvt
column integrated in each message table which marks each parameter included
Note 1 to entry: The following conventions are used: C = Conditional: the parameter marked “C” in a
request/response message is present only under a condition specified in the bottom row of the message table;
M = Mandatory: the parameter marked “M” in a request/response message table is always present; U = User
(optional): the parameter marked “U” in a request/response message table is supplied depending on dynamic
usage by the manufacturer. The convention recommends a mnemonic, which might be used for implementation.
In no case is the specified mnemonic ever a mandatory requirement for any implementation.
3.1.8
electronic control unit
ECU
generic term for any electronic control unit
3.1.9
emissions-related DTC
DTC which is set when a malfunction causes vehicle emissions to exceed legislated emission thresholds
or is otherwise required to be set as specified by on-board diagnostics legislation (e.g. disables another
part of the diagnostic system)
Note 1 to entry: Normally, the malfunction indicator (MI) is illuminated at the same time as the emissions-related
DTC is set. The determination of which DTCs are emissions-related is made by the vehicle manufacturer for each
vehicle, as specified by on-board diagnostic legislation.
3.1.10
fuel trim
FT
feedback adjustments to the base fuel schedule
Note 1 to entry: Short-term fuel trim refers to dynamic or instantaneous adjustments. Long-term fuel trim refers
to much more gradual adjustments to the fuel calibration schedule than short-term trim adjustments. These
long-term adjustments compensate for vehicle differences and gradual changes that occur over time.
3.1.11
negative numbers
signed binary, the most significant bit (MSB) of the binary number used to indicate positive (0)/
negative (1)
Note 1 to entry: 2’s complement: negative numbers are represented by complementing the binary number and
then adding 1.
EXAMPLE –0,99 = 8001 = 1000 0000 0000 0001
16 2
0 = 0000 = 0000 0000 0000 0000
16 2
+0,99 = 7FFF = 0111 1111 1111 1111
16 2
Note 2 to entry: (–0,99) + (+0,99) = 0.
3.1.12
number
expressed by this symbol “#”
3.1.13
P2, P3 timing parameter
application timing parameters for the ECU(s) and the external test equipment
3.1.14
P2 timing parameter
CAN_min
CAN application timing parameter with the minimum value for the ECU(s) and the external test
equipment to start the response message
3.1.15
P2 timing parameter
CAN_max
CAN application timing parameter with the maximum value for the ECU(s) and the external test
equipment to indicate a response message
3.1.16
P2 timing parameter
reload
CAN application timing parameter with the maximum value (P2 ) for external test equipment
CAN_max
only
3.1.17
server
function that is part of an ECU that provides the diagnostic services
Note 1 to entry: This part of ISO 15031 differentiates between the server, i.e. the function, and the electronic
control unit so that it remains independent from the implementation.
3.1.18
service
information exchange initiated by a client (external test equipment) in order to require diagnostic
information from a server (ECU) and/or to modify its behavior for diagnostic purposes
Note 1 to entry: This is also the equivalent of test mode or mode.
3.2 Abbreviated terms
.con confirmation
.ind indication
.req request
4 © ISO 2015 – All rights reserved
CRC cyclic redundancy check
CVN calibration verification number
DTC diagnostic trouble code
ECM engine control module
ERR error detection byte
EWMA exponential weighted moving average
FF first frame
ISR interrupt service routine
LSB least significant bit
MI malfunction indicator
MIL malfunction indicator light
MSB most significant bit
N_PDU network protocol data unit
N/A not applicable
NRC negative response code
NVRAM non-volatile memory
OBDMID OBD monitor identifier
PID parameter identifier
PCI protocol control information
RSP in-frame response
SF single frame
SOM start of message
T_AE virtual transport interface address extension
T_Data [ ] virtual transport interface data field
T_Mtype virtual transport interface message type
T_Length virtual transport interface length information
T_PDU virtual transport interface protocol data unit
T_Result virtual transport interface result
T_SA virtual transport interface source address
T_TA virtual transport interface target address
T_TAtype virtual transport interface target address type
TCM transmission control module
TID test identifier
UASID unit and scaling identifier
VIN vehicle identification number
4 Conventions
This International Standard is based on the conventions specified in the OSI Service Conventions
(ISO/IEC 10731) as they apply for diagnostic services.
5 Document overview
Figure 2 illustrates the emissions-related OBD in ISO 15765-4, SAE J1850, ISO 9141-2, and ISO 14230-4.
The protocol initialization identifies whether ISO 15765-4 DoCAN or SAE J1850 or ISO 14230-4 DoK-
Line or ISO 9141-2 is the data link layer supported by the vehicle. This International Standard references
the standards as an applicable data link for emissions-related OBD.
This part of ISO 15031 specifies the applicable emissions-related diagnostic services. It specifies the
data record structures and
...
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