Electro-Mechanical Power Steering.pdf

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Electro-mechanical Power Steering
Design and Function
Self-Study Program
Course Number 892403
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Volkswagen of America, Inc.
Service Training
Printed in U.S.A.
Printed 12/04
Course Number 892403
©2004 Volkswagen of America, Inc.
All rights reserved. Information contained
in this manual is based on the latest
information available at the time of printing and
is subject to the copyright and other intellectual
property rights of Volkswagen 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
Volkswagen of America, Inc.
Always check Technical Bulletins and the latest
electronic service repair information that may
supersede any information included in this
booklet.
Trademarks: All brand names and product
names used in this manual are trade names,
service marks, trademarks, or registered
trademarks; and are the property of their
respective owners.
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Table of Contents
Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Electro-mechanical Power Steering with Dual Pinion,
Electro-mechanical Power Steering Components
System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
System Overview
Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Control Map Characteristics, The Steering Function, Straight-Line
Stability
Steering Mechanics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
The Steering Gear
Steering Electrics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Steering Angle Sensor G85, Steering Torque Sensor G269, Rotor
Speed Sender, Road Speed, Engine Speed (RPM) Sensor G28,
Electro-mechanical Power Steering Motor V187, Power Steering
Control Module J500, Electro-mechanical Power Steering Indicator
Lamp K161, Special Features
Functional Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Functional Diagram
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Diagnosis
Knowledge Assessment
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
New!
The Self-Study Program provides you with information
regarding designs and functions.
Important/Note!
The Self-Study Program is not a Repair Manual!
For maintenance and repair work, always refer to the
current technical literature.
i
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Introduction
Electro-mechanical Power Steering
with Dual Pinion
The steering system components are:
• Steering wheel
• Steering Angle Sensor G85
• Steering column
• Steering Torque Sensor G269
• Steering gear
• Electro-mechanical Power Steering
Motor V187
• Power Steering Control Module J500
Steering Wheel
Steering Column
Steering Gear
Universal Joint Shaft
Steering Torque
Sensor G269
Electro-mechanical Power
Steering Motor V187
Power Steering
Control Module J500
1
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