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Audi of America, Inc. Service Training Printed in U.S.A. Printed 10/99 Course Number 971903 . All information contained in this manual is based on the latest product information available at the time of printing. The right is reserved to make changes at any time without notice. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the publisher. This includes text, figures and tables. Always check Technical Bulletins and the Audi Worldwide Repair Information System for information that may supersede any information included in this booklet. Contents Introduction .. 1 CAN Data Bus .. 2 Data Transfer, The CAN Data Bus, The Principle of Data Transfer, What Components Make Up a CAN Data Bus , Data Transfer Process Data Transfer 8 What Does the CAN Data Bus Transfer Function 10 How is a Data Protocol Produced , CAN Data Bus Allocation, Sources of Interference CAN Data Bus in the Drive Train 15 The Data Bus in the Drive Train, The Information in the Drive Train, Networking of the Control Modules in the Drive Train, Self Diagnosis of the CAN Data Bus in the Drive Train CAN Data Bus in the Convenience System 21 Future Use of the CAN Data Bus in the Convenience System, The Features of the CAN Data Bus in the Convenience System, Information in the Convenience System, Networking of Control Units in the Convenience New System, The Self Diagnosis of the CAN Data Bus in the Convenience System Teletest .. 29 Audi CAN Data Bus Teletest and Answer Form Important/Note The Self Study Program is not a Workshop Manual Precise instructions for testing, adjustment and repair can be found in the appropriate Workshop Manual. i Introduction The requirements relating to driving safety, The CAN data bus by Bosch is such a drivi