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Motor Vehicle Exhaust Emissions Emission Control and Standards Self Study Program Course Number 943003 Audi of America, Inc. Service Training Printed in U.S.A. Printed 3/01 Course Number 943003 2001 Audi of America, Inc. . Information contained in this manual is based on the latest information available at the time of printing and is subject to the and other intellectual property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, nor may these materials be modified or reposted to other sites without the prior expressed written permission of the publisher. All requests for permission to copy and redistribute information should be referred to Audi of America, Inc. Always check Technical Bulletins and the Audi Worldwide Repair Information System for information that may supersede any information included in this booklet. Table of Contents Page Course Goals ii Introduction . 1 Composition 2 Exhaust Gas Components . 3 Operating Conditions and their Effect on Exhaust Gas Composition 7 Methods of Reducing Emissions 11 Reduction of Fuel Consumption 11 Management of Fuel Vapor Losses . 15 Treatment of Exhaust Gases 16 Performance Monitoring On Board Diagnostics . 17 Certification and Testing 18 Federal Emissions Certification 18 California Emissions Standards 22 Regional Differences 23 Emissions Inspection . 24 Summary 25 Teletest . 27 i Course Goals Course goals Recognize the need for emissions controls Review the composition of exhaust gases Identify methods for reducing harmful pollutants Outline specific testing procedures ii Introduction Introduction The effects