ISO 22901-3:2018

Road vehicles — Open diagnostic data exchange (ODX) — Part 3: Fault symptom exchange description (FXD)

ISO 22901-3:2018 specifies machine-readable descriptions of all fault symptom algorithms which are implemented as diagnostic software in an electronic control unit (ECU). The main use case is the standardized data exchange from a function & software supplier to a vehicle manufacturer (VM) in order to enable a tool-based information processing. Based on the FXD content and associated calibration values, several end user documents can be generated such as the "summary sheet" needed as part of the vehicle type approval documentation package or the "repair and maintenance information" (RMI). The expected main benefits of the FXD approach are an overall efficiency improvement as well as an independency of supplier- and VM-specific format handling.

Véhicules routiers — Diagnostic généralisé, échange de données (ODX) — Partie 3: Format d'échange de système de défaut (FXD)

General Information

• Status: Published
• Publication Date: 01-Feb-2018
• ICS: 43.180 - Diagnostic, maintenance and test equipment
• Technical Committee: ISO/TC 22/SC 31 - Data communication
• Drafting Committee: ISO/TC 22/SC 31/WG 5 - Test equipment/Data eXchange Formats
• Parallel Committee: ISO/TC 43/SC 1 - Noise
• Current Stage: 9093 - International Standard confirmed
• Start Date: 02-Jul-2025
• Completion Date: 05-Jul-2025

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 22901-3
First edition
2018-02
Road vehicles — Open diagnostic data
exchange (ODX) —
Part 3:
Fault symptom exchange description
(FXD)
Véhicules routiers — Diagnostic généralisé, échange de données
(ODX) —
Partie 3: Format d'échange de système de défaut (FXD)
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 1
5 Specification release version information . 2
5.1 Specification for FXD XML-Schema release version. 2
6 FXD concept . 2
6.1 Overview . 2
6.2 Traditional workflow . 3
6.3 Raw information . 3
6.3.1 General definition and background . 3
6.3.2 Requirements . 3
6.4 FXD format and example . 4
6.5 Basic concept of FXD . 5
6.5.1 Basic requirements . 5
6.5.2 Formal description of diagnosis algorithms . 5
6.5.3 Value inheritance mechanism to support use cases . 6
6.6 FXD workflow . 7
6.7 FXD workflow example . 8
6.8 Constraints for schema updates . 9
7 FXD use cases .10
7.1 General .10
7.2 UC 1 Delivery of "raw information" by ECU software suppliers .10
7.3 UC 2 – Generation of documentation based on FXD raw information .11
7.3.1 UC 2.1 Generation of OBD summary sheet for vehicle type approval .11
7.3.2 UC 2.2 FXD-based repair and maintenance information .11
8 General properties of FXD elements .12
8.1 Attributes .12
8.1.1 DESC-EXTENT (Content) .13
8.1.2 HREF (Content) .13
8.1.3 ID (Infrastructure) . . .13
8.1.4 ID-REF (Infrastructure) .14
8.1.5 OID (Content).14
8.1.6 OPERATOR (Content) .15
8.1.7 SI (Content) .15
8.1.8 DESC-STATE (Content).15
8.1.9 TI (Infrastructure) .16
8.1.10 VERSION (Content) .16
8.1.11 xml:base (Infrastructure) .16
8.1.12 xml:lang (Infrastructure) .16
8.1.13 xsi:nil (Content) .17
8.1.14 xsi:type (Infrastructure) .17
8.2 Variant coding .17
8.3 Generic selection lists .18
8.4 External document references .18
8.5 Referencing ECU variables and calibration labels .18
8.6 General FXD elements, used for identification and description .18
9 Description of FXD elements .19
9.1 General .19
9.2 ADMIN-DATA .19
9.2.1 General.19
9.2.2 COMPANY-DATA-REF . .19
9.2.3 ECU-FAMILY .19
9.2.4 PROJECT .19
9.2.5 RESOURCES .19
9.2.6 DOC-REVISIONS . . .19
9.3 COMPANY-DATAS .20
9.3.1 General.20
9.3.2 COMPANY-DATA .20
9.4 DATA-DICTIONARY .20
9.4.1 DATA-DECLARATIONS .20
9.4.2 COMPUTATIONS .21
9.4.3 UNIT-SPEC .22
9.5 VARIABLE-DESCRIPTIONS .22
9.5.1 General.22
9.5.2 Element-Id .23
9.5.3 COMPANY-DATA-REF . .23
9.5.4 ECU-FUNCS .23
9.5.5 CONFIGURATION .23
9.5.6 DATA-DECLARATION described by a VARIABLE-DESCRIPTION .23
9.5.7 SIMPLE-VARIABLE .23
9.5.8 BIT-FIELD-VARIABLE .23
9.5.9 STATE-GRAPH .
...