At one time, fixing an automatic transmission
involved taking it apart, cleaning and inspecting the
internal components, and replacing worn parts. While this
took skill and attention to detail, it was a relatively simple
procedure. Since there were only a few types of automatic
transmissions, technicians could become proficient in a
short period of time. Many automatic transmission techni-
cians learned by experience, making mistakes and learning
from them.
Today, it is almost impossible to get started on a career
in automatic transmission and transaxle repair without
formal training and a great deal of study. The modern tech-
nician must deal with about 75 different transmissions and
transaxles. The high cost of parts and labor prevent the
technician from using trial and error to diagnose a trouble-
some transmission. Today’s technicians must develop the
same troubleshooting and repair skills needed in the past,
but must also learn to diagnose complex electrical and
electronic problems.
Automatic Transmissions and Transaxles provides the
latest information on the design, construction, diagnosis,
service, and repair of the automatic transmissions and
transaxles used in late-model vehicles. This text has been
carefully designed so all pertinent components are identi-
fied and operating principles are fully explained before
troubleshooting, service, and repair are discussed.
Each chapter of this text begins with a list of objec-
tives that provide focus for the chapter. A list of important
technical terms is also presented at the beginning of each
chapter. Be sure to look for these terms as you read through
the chapters. They will be printed in bold italic type when
first used in the body of the chapter and will be defined
when introduced. Figure references are printed in bold
type for ease of identification. Warnings and cautions are
provided when the risk of injury or property damage is
present. Notes are used to highlight information that
supplements the material presented in the body of the text.
ASE certification is becoming increasingly important.
In a few years, it may be difficult to get a job as an auto-
motive technician if you are not certified. Automatic
Transmissions and Transaxles is a valuable resource for
those preparing for ASE Certification Test A2, Automatic
Transmission/Transaxle. The content is correlated to the
ASE/NATEF Task List. ASE-type questions at the end of each
chapter help students prepare for the questions encoun-
tered on the ASE tests. In addition, Chapter 20 is devoted
to information about preparing for and taking ASE tests.
A Workbook for Automatic Transmissions and Transaxles
is available to complement this textbook. The workbook
contains additional test questions, as well as jobs to help
you develop your hands-on service techniques. The
chapters in the workbook are correlated to those in the
textbook.
By choosing Automatic Transmissions and Transaxles,
you have made a good start in preparing for a career in the
field of automotive service and repair.
Chris Johanson
James E. Duffy
3
Introduction