ISO 9141:1989 道路車両—診断システム—デジタル情報の交換の要件 | ページ 2

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.

Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting.

International Standard ISO 9141 was prepared by Technical Committee ISO/TC 22, Road vehicles.

Introduction

This International Standard has been established with a view to specifying the following desirable features for the diagnosis of electronically controlled on-board systems:

• 1) determination of the electrical requirements of a diagnostic system so that diagnostic equipment having at least minimum functional capability as specified herein will be compatible with any on-board diagnostic system designed in accordance with these specifications;
• 2) limitation of the number of contacts on electronically controlled systems for unidirectional and bidirectional diagnostic communication;
• 3) transmission of identifying information, as well as operational status information including actual values of parameter and required values.

The diagnostic communication is expected to fulfil one or more of the following aims:

• a) to determine if a system is functioning correctly;
• b) to carry out an inspection;
• c) to locate deviations from specification and achieve economic repair;
• d) to confirm a system has been restored to correct operation;
• e) to reset or adjust system operating values in an Electronic Control Unit (ECU) in strict accordance with the vehicle manufacturer's instructions;
• f) to give recorded information related to service activities.

This may be accomplished by way of one or more of the following:

• a) identification of the components in a system;
• b) output of diagnostic information from an ECU;
• c) examination of a wide range of sensor and operating parameter values;
• d) carrying out specific actions;
• e) changes in data held in the ECU in strict accordance with the vehicle manufacturer's instructions.

1 Scope

This International Standard specifies the requirements for setting up the interchange of digital information between onboard Electronic Control Units (ECUs) of road vehicles and suitable diagnostic testers. This communication is established in order to facilitate inspection, test diagnosis and adjustment of vehicles, systems and ECUs.

This International Standard does not apply when systemspecific diagnostic test equipment is used.

This International Standard does not apply to the use of flashing code techniques.

2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.

3 Definitions

For the purposes of this International Standard, the following definitions apply.