Road vehicles -- Communication between vehicle and external equipment for emissions-related diagnostics

ISO 15031-6:2015 provides uniformity for standardized diagnostic trouble codes (DTC) that electrical/electronic On-Board Diagnostic (OBD) systems of motor vehicles are required to report when malfunctions are detected. It further provides guidance for uniform messages (text descriptor) associated with these codes. ISO 15031-6:2015 specifies the rules and guidelines for the definition of the following: a) the diagnostic trouble code format, which consists of addressing format, structure and messages; b) a description of the standardized set of diagnostic trouble codes and descriptions contained in SAE J2012-DA. The two most significant bytes of a DTC may be decoded according to two different lists in two formats: DTC Format Identifier 0016 and 0416; and c) a description of the standardized set of diagnostic trouble codes subtypes known as failure types contained in SAE J2012-DA (applies only when 3-byte DTCs are used). ISO 15031-6:2015 specifies all general rules and guidelines to define new diagnostic trouble codes. It references SAE J2012-DA (Digital Annex), which includes all standardized DTCs (number and text descriptor) as well as all diagnostic trouble codes subtypes known as failure types.

Véhicules routiers -- Communications entre un véhicule et un équipement externe concernant le diagnostic relatif aux émissions

General Information

Status
Published
Publication Date
27-Jul-2015
Current Stage
9020 - International Standard under periodical review
Start Date
15-Jul-2020
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INTERNATIONAL ISO
STANDARD 15031-6
Third edition
2015-08-01
Road vehicles — Communication
between vehicle and external
equipment for emissions-related
diagnostics —
Part 6:
Diagnostic trouble code definitions
Véhicules routiers — Communications entre un véhicule et un
équipement externe concernant le diagnostic relatif aux émissions —
Partie 6: Définition des codes d’anomalie de diagnostic
Reference number
ISO 15031-6:2015(E)
ISO 2015
---------------------- Page: 1 ----------------------
ISO 15031-6:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland

All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 15031-6:2015(E)
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........................................................................................................................................................................................... 2

6 General specification ....................................................................................................................................................................................... 4

6.1 General code information .............................................................................................................................................................. 4

6.2 Sensor location definition ............................................................................................................................................................. 4

6.2.1 General...................................................................................................................................................................................... 4

6.2.2 Definition of V6/V8/V12 cylinder engine with two exhaust banks and

four catalysts ....................................................................................................................................................................... 5

6.2.3 Definition of V6/V8/V12 cylinder engine with two exhaust banks and

three catalysts .................................................................................................................................................................... 5

6.2.4 Definition of L4/L5/L6 cylinder engine with one exhaust bank and

two catalysts ........................................................................................................................................................................ 6

6.2.5 Definition of L4/L5/L6 cylinder engine with one exhaust bank and one catalyst . 6

6.2.6 Definition of turbocharger/supercharger pressure sensor location draw-

thru system ........................................................................................................................................................................... 6

7 Format structure .................................................................................................................................................................................................. 7

7.1 Description ................................................................................................................................................................................................. 7

7.2 ISO/SAE controlled codes (core DTCs) .............................................................................................................................. 9

7.3 Manufacturer controlled codes (non-uniform DTCs) ............................................................................................ 9

7.4 Body system groupings .................................................................................................................................................................10

7.5 Chassis system groupings ...........................................................................................................................................................10

7.6 Powertrain system groupings .................................................................................................................................................10

7.7 Network and vehicle integration groupings ...............................................................................................................10

8 Diagnostic trouble code descriptions ..........................................................................................................................................11

8.1 Diagnostic trouble code application ..................................................................................................................................11

8.2 Powertrain systems .........................................................................................................................................................................11

8.3 Body systems .........................................................................................................................................................................................12

8.4 Chassis systems ...................................................................................................................................................................................12

8.5 Network and vehicle integration systems ....................................................................................................................12

Annex A (normative) Diagnostic trouble code naming guidelines ....................................................................................13

Bibliography .............................................................................................................................................................................................................................16

© ISO 2015 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 15031-6:2015(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 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 15031-6:2010), 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
iv © ISO 2015 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 15031-6:2015(E)
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 J2012 (Diagnostic Trouble Code Definitions).

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 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:
— ISO 15031-5 (emissions-related OBD);
— ISO 27145-3 (WWH-OBD).
— Presentation layer (layer 6), specified in the following:
— ISO 15031-2, SAE J1930-DA;
— ISO 15031-5, SAE J1979-DA;
— ISO 15031-6, SAE J2012-DA (OBD);
— ISO 27145-2, SAE J2012-DA (WWH-OBD).
— 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 Transport protocol and network layer services;
— SAE J1850 defined in ISO 15031-5 Emissions-related diagnostic services;
— ISO 9141-2 defined in ISO 15031-5 Emissions-related diagnostic services;
— ISO 14230-4 defined in ISO 15031-5 Emissions-related diagnostic services.
— Network layer services (layer 3), specified in the following:
— ISO 15765-2 Transport protocol and network layer services;
— SAE J1850 defined in ISO 15031-5 Emissions-related diagnostic services;
— ISO 9141-2 defined in ISO 15031-5 Emissions-related diagnostic services;
— ISO 14230-4 defined in ISO 15031-5 Emissions-related diagnostic services.
— Data link layer (layer 2), specified in the following:
— ISO 15765-4, ISO 11898-1, ISO 11898−2;
© ISO 2015 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO 15031-6:2015(E)
— SAE J1850;
— ISO 9141-2;
— ISO 14230-2.
— Physical layer (layer 1), specified in the following:
— ISO 15765-4, ISO 11898-1, ISO 11898−2;
— SAE J1850;
— ISO 9141-2;
— ISO 14230-1.

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 ISO 27145-3
(layer 7)
ISO 15031-2, -5, -6 ISO 27145-2
Presentation
SAE J1930-DA/SAE J1979-DA SAE J1930-DA/SAE J1979-DA
(layer 6)
SAE J2012-DA (OBD) SAE J2012-DA (WWH-OBD)
Seven layer
according to Session
Not applicable ISO 14229-2
ISO/IEC (layer 5)
7498-1
Transport
and
(layer 4)
ISO ISO ISO ISO
ISO/IEC
ISO 15031-5
14230-4 15765-2 15765-2 13400-2
10731
Network
(layer 3)
ISO ISO
15765-4 27145-4
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
SAE document reference concept

ISO 15031 references several SAE documents which contain all terms, data, and DTC definitions.

See Figure 1 with the following definition of content in this International Standard.

— 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 like

PIDs, test IDs, monitor IDs, and InfoType IDs.

— SAE J2012: the document is concerned with the procedure for defining emissions-related diagnostic

trouble codes. It references SAE J2012-DA which contains all standardized data items like DTCs and

FTBs.
vi © ISO 2015 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 15031-6:2015(E)
ISO 15031-2
ISO15031-5 ISO15031-6
Terms, definitions,
Emissions-related Diagnostic trouble
abbreviationsand
diagnostic services code (DTC)definitions
acronyms
SAEJ2012-DA
SAEJ1930-DA SAEJ1979-DA
emissions-related
emissions-related emissions-related
diagnostic trouble
acronymdefinition data definition
code definition
SAEJ1930
SAEJ1979 SAEJ2012
Terms, definitions,
Emissions-related Diagnostic trouble
abbreviationsand
diagnostic services code (DTC)definitions
acronyms
Key
1 SAE Digital Annexes
Figure 1 — SAE Digital Annex document reference

On-Board Diagnostic (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.

New emissions-related regulatory requirements drive new in-vehicle technology to lower emissions.

New technology-related OBD monitor data and diagnostic trouble codes 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.
SAE J2012-DA (OBD) Digital Annex

This part of ISO 15031 references SAE J2012-DA. SAE J2012-DA is concerned with the definition of DTCs

(diagnostic trouble codes) and FTB (failure type byte) information.
SAE J2012-DA (OBD) includes several appendices for
— diagnostic trouble code naming guidelines,
— powertrain system diagnostic trouble codes,
— network communication system, body systems, chassis systems, and
— DTC failure category and subtype definition.
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 diagnostic trouble codes 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.

Revision request forms 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=TEVDS9
© ISO 2015 – All rights reserved vii
---------------------- Page: 7 ----------------------
ISO 15031-6:2015(E)

The column titled “Resources” shows a document with the title: J2012-DA_Revision_Request_Form.doc.

Double click on the name and you will be asked to download the document with the filename:

SAE J2012-DA_Revision_Request_Form.doc
Fill out the revision request form with your request.
Please send e-mail with completed revision request form as attachment to:
SAE Headquarters
755 West Big Beaver Road
Suite 1600
Troy, MI 48084-4093, USA
Fax: +1 (248) 273-2494
Email: saej2012@sae.org
viii © ISO 2015 – All rights reserved
---------------------- Page: 8 ----------------------
INTERNATIONAL STANDARD ISO 15031-6:2015(E)
Road vehicles — Communication between vehicle and
external equipment for emissions-related diagnostics —
Part 6:
Diagnostic trouble code definitions
1 Scope

This part of ISO 15031 provides uniformity for standardized diagnostic trouble codes (DTC) that

electrical/electronic On-Board Diagnostic (OBD) systems of motor vehicles are required to report

when malfunctions are detected. It further provides guidance for uniform messages (text descriptor)

associated with these codes.

This part of ISO 15031 specifies the rules and guidelines for the definition of the following:

a) the diagnostic trouble code format, which consists of the following:
1) addressing format;
2) structure;
3) messages;

b) a description of the standardized set of diagnostic trouble codes and descriptions contained in

SAE J2012-DA. The two most significant bytes of a DTC may be decoded according to two different

lists in two formats: DTC Format Identifier 00 and 04 ;
16 16

c) a description of the standardized set of diagnostic trouble codes subtypes known as failure types

contained in SAE J2012-DA (applies only when 3-byte DTCs are used).

This part of ISO 15031 specifies all general rules and guidelines to define new diagnostic trouble codes.

This part of ISO 15031 references SAE J2012-DA (Digital Annex), which includes all standardized DTCs

(number and text descriptor) as well as all diagnostic trouble codes subtypes known as failure types.

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/IEC 10731:1994, Information technology — Open Systems Interconnection — Basic Reference Model —

Conventions for the definition of OSI services

ISO 15031-2, Road vehicles — Communication between vehicle and external equipment for emissions-

related diagnostics — Part 2: Guidance on terms, definitions, abbreviations and acronyms

ISO 15031-5, Road vehicles — Communication between vehicle and external equipment for emissions-

related diagnostics — Part 5: Emissions-related diagnostic services
© ISO 2015 – All rights reserved 1
---------------------- Page: 9 ----------------------
ISO 15031-6:2015(E)
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 15031-2 apply.

3.2 Abbreviated terms
B1S1 Bank 1 Sensor 1
B1S2 Bank 1 Sensor 2
B1S3 Bank 1 Sensor 3
B2S1 Bank 2 Sensor 1
B2S2 Bank 2 Sensor 2
B2S3 Bank 2 Sensor 3
BARO barometric atmospheric pressure
CVN calibration verification number
DTC diagnostic trouble code
ECM engine control module
ISR interrupt service routine
LSB least significant bit
MAF mass air flow
MAP manifold absolute pressure
MIL malfunction indicator light
MSB most significant bit
OBD On-Board Diagnostics
OSI Open Systems Interconnection
PCM powertrain control module
SI international system of units
TCM transmission control module
4 Conventions

ISO 15031 is based on the conventions discussed in the OSI Service Conventions (ISO/IEC 10731) as

they apply for diagnostic services.
5 Document overview
Figure 2 illustrates the document references.
2 © ISO 2015 – All rights reserved
---------------------- Page: 10 ----------------------
ISO 15031-6:2015(E)

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. ISO 15031 references the standards as

an applicable data link for emissions-related OBD.

ISO 15031-5 specifies the applicable emissions-related diagnostic services. This part of ISO 15031

specifies the data record structures and references SAE J1930-DA, SAE J1979-DA, and SAE J2012-DA

which include all emissions-related OBD data definitions.
Emissions-relateddiagnosticservices
ISO15031-1
EmissionsOBD
Generalinformation and
usecasedefinition
SAEJ1930-DA
Terms, ..
ISO15031-5
Emissions-related
OSILayer7
diagnostic services
SAEJ1979-DA
Application
PIDs,MIDs, RIDs,
InfoTypes
ISO 15031-2,-5, -6
SAEJ2012-DA
Emissions-related 1: 1
OSILayer6
DTCs
Terms, Data,DTCs
Presentation
ISO14229-2 ISO14229-2
NotApplicable
UDS UDS
OSILayer5
(nodocumentavailable)
Part2: Session layerservices Part2: Sessionlayerservices
Session

Standardized ServicePrimitive Interface NotApplicable Standardized ServicePrimitive Interface

ISO 15765-4 SAE ISO ISO 14230-4
J1850 9141-2
ISO15031-5
OSILayer4 ISO15765-2
Communicationbetween vehicleand external
Transport DoCAN
testequipmentforemissions-relateddiagnostics
Part2:
Part5:
Transport
Emissions-relateddiagnosticservices
and
Network
layerservices
OSILayer3
ISO 15765-4 ISO14230-4
Network
DoCAN DoK-Line
Part4:
Part4:
Requirements for
Requirements
emissions-
foremissions-
ISO11898-1CAN ISO14230-2
relatedsystems
relatedsystems
Data linklayer DoK-Line
ISO9141-2
OSILayer2
SAEJ1850
and physical Part2:
Data Link
signalling Data linklayer
Part2:
ClassB
CARB
Data
requirement
Communi-
sfor
cations
ISO11898CAN interchange
ISO14230-1
Network
Part2: High- of digital
DoK-Line
Interface
OSILayer1
speedmedium information
Part1:
Physical
access unit
Physicallayer

Figure 2 — Emissions-related OBD on ISO 15765-4, SAE J1850, ISO 9141-2, ISO 14230-4

document reference according to OSI model
© ISO 2015 – All rights reserved 3
---------------------- Page: 11 ----------------------
ISO 15031-6:2015(E)
6 General specification
6.1 General code information

Table 2 specifies systems, code categories, hexadecimal values, and particular sections of

electrical/electronic systems diagnostic.
Table 2 — General code specifications
System Code categories Hex value Appendix
Body B0xxx – B3xxx 8XXX – BXXX B
16 16
Chassis C0xxx – C3xxx 4XXX – 7xxx C
16 16
Powertrain P0xxx – P3xxx 0XXX – 3XXX P
16 16
Generic/Network and vehicle U0xxx – U3xxx CXXX – FXXX U
16 16
integration

The recommended DTCs consist of a three digit hexadecimal code preceded by an alphanumeric

designator. The alphanumeric designators are “B0”, “B1”, “B2”, “B3”, “C0”, “C1”, “C2”, “C3”, “P0”, “P1”,

“P2”, “P3”, “U0”, “U1”, “U2”, “U3”, corresponding to four sets of body, four sets of chassis, four sets of

powertrain, and four sets of network and vehicle integration trouble codes. The code structure itself

is partially open-ended. A portion of the available numeric sequences (portions of “B0”, “C0”, “P0”,

“P2”, “P3”, “U0”, and “U3”) is reserved for uniform codes assigned by this or future updates. Detailed

specifications of the DTC format structure are specified in Clause 7. Most circuit, component, or system

diagnostic trouble codes that do not support a subfault strategy are specified by the following four

basic categories:
— circuit/open;
— range/performance;
— circuit low;
— circuit high.

Circuit low is measured with the external circuit, component, or system connected. The signal type

(voltage, frequency, etc.) shall be included in the message after circuit low or circuit high.

Circuit high is measured with the external circuit, component, or system connected. The signal type

(voltage, frequency, etc.) may be included in the message after circuit low or circuit high.

6.2 Sensor location definition
6.2.1 General

This subclause defines the location of sensor(s) in relation to the engine air flow, starting from the

fresh air intake through to the vehicle tail pipe or fuel flow from the fuel tank to the engine in order

numbering 1, 2, 3, and so on.

NOTE 1 If there is only one bank, use bank #1 DTCs and the word bank may be omitted. With a single “bank”

system using multiple sensors, use bank #1.
NOTE 2 See Figure 3 to Figure 7.
4 © ISO 2015 – All rights reserved
---------------------- Page: 12 ----------------------
B1S1 B1S2
Catalyst
ISO 15031-6:2015(E)

6.2.2 Definition of V6/V8/V12 cylinder engine with two exhaust banks and four catalysts

1 2 3
B1S1 B1S2 B1S3
Catalyst Catalyst TailPipe
CylinderBank1
Cyl.
ExhaustBank1
V6/V8/V12CylinderEngine Transmission
CylinderBank2
ExhaustBank2
TailPipe
Catalyst Catalyst
B2S1 B2S3
B2S2
5 6
Key
1 B1S1 – Bank 1 Sensor 1 wide range
2 B1S2 – Bank 1 Sensor 2 heated
3 B1S3 – Bank 1 Sensor 3 heated
4 B2S1 – Bank 2 Sensor 1 wide range
5 B2S2 – Bank 2 Sensor 2 heated
6 B2S3 – Bank 2 Sensor 3 heated

Figure 3 — V6/V8/V12 cylinder engine with two exhaust banks and four catalysts example

6.2.3 Definition of V6/V8/V12 cylinder engine with two exhaust banks and three catalysts

CylinderBank1
Cyl.
ExhaustBank1
B1S3
V6/V8/V12CylinderEngine Transmission
Catalyst TailPipe
CylinderBank2
ExhaustBank2
Key
1 B1S1 – Bank 1 Sensor 1 wide range
2 B1S2 – Bank 1 Sensor 2 heated
3 B1S3 – Bank 1 Sensor 3 heated
4 B2S1 – Bank 2 Sensor 1 wide range

Figure 4 — V6/V8/V12 cylinder engine with two exhaust banks and three catalysts example

© ISO 2015 – All rights reserved 5
Catalyst
B2S1
B2S2
---------------------- Page: 13 ----------------------
ISO 15031-6:2015(E)

6.2.4 Definition of L4/L5/L6 cylinder engine with one exhaust bank and two catalysts

Cyl.
1 2 3
B1S1 B1S2 B1S3
Cyl.
TailPipe
Catalyst Catalyst
Cyl.
Cyl.
Key
1 B1S1 – Bank 1 Sensor 1 wide range
2 B1S2 – Bank 1 Sensor 2 heated
3 B1S3 – Bank 1 Sensor 3 heated

Figure 5 — L4/L5/L6 cylinder engine with one exhaust bank and two catalysts example

6.2.5 Definition of L4/L5/L6 cylinder engine with one exhaust bank and one catalyst

Cyl.
1 2
B1S1 B1S2
Cyl.
Catalyst TailPipe
Cyl.
Cyl.
Key
1 B1S1 – Bank 1 Sensor 1 wide range
2 B1S2 – Bank 1 Sensor 2 heated

Figure 6 — L4/L5/L6 cylinder engine with one exhaust bank and one catalyst example

6.2.6 Definition of turbocharger/supercharger pressure sensor location draw-thru system

The intake air system pressure sensor location for boosted applications in relation to the engine air

flow includes the fresh air inlet, boost device, and engine manifold.
6 © ISO 2015 – All rights reserved
L4CylinderEngine
L4CylinderEngine
ExhaustBank1
ExhaustBank1
---------------------- Page: 14 ----------------------
ISO 15031-6:2015(E)
1 2 3 4 5
Cyl.
Cyl.
Cyl.
Cyl.
7 6
Key
1 air cleaner
2 MAF
3 throttle body
4 turbocharger/supercharger
5 MAP (manifold pressure closest to the intake valves)
6 inlet (pressure after the throttle body, but before the pressurizing device)
7 BARO (atmospheric pressure)
Figure 7 — Turbocharger/supercharger pressure sensor location draw-thru system
7 Format structure
7.1 Description

Figure 8 illustrates the diagnostic trouble code which consists of an alphanumeric designator, B0 – B3

for body, C0 – C3 for chassis, P0 – P3 for powertrain, and U0 – U3 for network communication, followed

by three characters. The assignment of the proper alpha designator should be determined by the area

most appropriate for that function. In most cases, the alpha designator will be implied since diagnostic

information will be requested from a particular controller. However, this does not imply that all codes

supported by a particular controller shall have the same alphanumeric designator.

© ISO 2015 – All rights reserved 7
L4CylinderEngine
ExhaustBank1
---------------------- Page: 15 ----------------------
ISO 15031-6:2015(E)
Byte 1 Byte 2
b7 b6 b5 b4 b3 b2 b1 b0 b7 b6 b5 b4 b3 b2 b1 b0
4thcharacterof code
(Hexadecimal0...F)
[display character5]
3rdcharacterof code
(Hexadecimal0...F)
[display character4]
Area of vehiclesystem
(Hexadecimal0...F)
[display character3]
00=ISO/SAE controlled
01=manufacturercontrolled
10=ISO/SAE controlled
...

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