ISO INTERNATIONAL STANDARD 9141-2 First edition 1994-02-01 Road vehicles Diagnostic systems Part 2: CARB requirements for interchange of digital information Vehicules routiers -Systemes de diagnostic- Reference number ISO 9141-2:1994(E) ISO 9141-2:1994(E) Contents Page 1 Scope Normative references 3 Definitions 4 Specific configurations 5 Signal and communication specifications 2 6 Initialization of vehicle prior to serial communication 3 Initialization header 8 Requirements of diagnostic tester 6 9 Requirements of ECU 6 10 Requirements of wiring 7 11 Subsequent communication protocol 7 12 Message timing 9 13 Error handling 9 14 Worked example 10 Annex Tables of initialization, header and protocol timings, and electrical characteristics 13 ISO1994 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without per- mission in writingfrom the publisher. International Organization for Standardization CasePostale56·CH-1211Geneve20·Switzerland Printed in Switzerland ii ISO 9141-2:1994(E) Foreword IsoO (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. 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. International Standard iSO 9141-2 was prepared by Technical Committee ISO/TC 22, Road vehicles, Sub-Committee SC 3, Electrical and electronic equipment. IsO 9141 consists of the following part, under the general title Road ve- hicles - Diagnostic systems: Part 2: CARB requirements for interchange of digital information. NOTE - ISO 9141:1989,Road vehicles - Diagnostic systems - Re- quirements for interchange of digital information, is regarded as being part 1 of this International Standard. Annex A forms an integral part of this part of isO 9141. !！!