Troubleshooting and Repair Manual
ISB, ISBe4, QSB4.5, QSB5.9, QSB6.7, ISC, QSC8.3, ISL,
ISLe3 and QSL9 Engines, CM850 Electronic Control
System
Volume 1
Cummins Inc.
Box 3005
Columbus, Indiana, U.S.A., 47202
Registered Office
Cummins Engine Company, Ltd
Unit 1-B Uniongate, Ridgeway Trading Estate,
Iver,
Buckinghamshire SL0 9HX,
England
Registration 573951 England
Copyright© 2006
Cummins Inc.
Troubleshooting and Repair Manual ISB, ISBe4, QSB4.5, QSB5.9, QSB6.7, ISC, QSC8.3, ISL, ISLe3 and QSL9 Engines, CM850 Electronic Control SystemVolume 1Bulletin 4021416
Printed in U.S.A. 06-JANUARY-2006
p146
Troubleshooting and Repair Manual
ISB, ISBe4, QSB4.5, QSB5.9, QSB6.7, ISC, QSC8.3, ISL,
ISLe3 and QSL9 Engines, CM850 Electronic Control
System
Volume 1
Copyright© 2006
Bulletin 4021416
Cummins Inc.
Printed 06-JANUARY-2006
All rights reserved
Foreword
This manual provides instructions for troubleshooting and repairing this engine in the chassis. Component and
assembly rebuild procedures are provided in the engine shop manual. Refer to Section i - Introduction for instructions
on how to use this manual.
Read and follow all safety instructions. Refer to the WARNING in the General Safety Instructions in Section i
- Introduction.
The manual is organized to guide a service technician through the logical steps of identifying and correcting problems
related to the engine. This manual does not cover vehicle or equipment problems. Consult the vehicle or equipment
manufacturer for repair procedures.
A series of specific service manuals (for example: Shop, Specifications, and Alternative Repair) are available and can
be ordered by Contacting your local area Cummins Regional office. A Cummins Regional office listing is located in
Service Literature (Section L).
The repair procedures used in this manual are recommended by Cummins Inc. Some service procedures require the
use of special service tools. Use the correct tools as described.
Cummins Inc. encourages the user of this manual to report errors, omissions, and recommendations for