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ISO INTERNATIONAL STANDARD 9141 First edition 1989-10-01 Road vehicles Diagnostic systems Requirements for interchange of digital information Véhicules routiers - S Systemes de diagnostic - Caracteristiques de I'échange de donnees numeriques Reference number ISO 9141 : 1989 (E) No reproducion or networking permited without license from IHS Not for Resale ISO9141:1989(E) Contents Page Foreword. ili Introduction iv Scope 2 Normative references 3 Definitions 4 General configurations.. 2 5 Signal and communication specifications . 2 6 Initialization of the ECU prior to serial communication. .. . . . 5 Header 6 8Requirements of the diagnostic tester . 8 9RequirementsoftheECU 10 10Requirements of the wiring 12 ISO1989 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 permission in writing from the publisher. International Organization for Standardization Case postale 56 . CH-1211 Geneve 20 . Switzerland Printed in Switzerland ii Copyright International Organization for Standardization ISO9141:1989 (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 normaily carried out through Iso technical committees. Each member the right to be represented on that committee. International organizations, govern- mental 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 thetechnical 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 1SO/Tc 22, Road vehicles. ili No reproduction or networking permited without license from IHS Not for Resale

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