1.0 INTRODUCTION
IMPORTANT
The 2004 model year, PL vehicles will inte-
grate the Transmission Control Module and
Powertrain Control Module into a single con-
trol module. This new module is called the
Next Generation Controller (NGC) for
DaimlerChrysler and will be referred to as the
Powertrain Control Module (PCM). The
Transmission Control System is part of the
Powertrain Control Module.
The PCM will have four color coded connec-
tors, C1 through C4, (C1-BLK, C2-GRAY, C3-
WHITE, C4-GREEN), each PCM connector will
have 38 pins each. Two tools are used for
probing and repairing the PCM connectors. A
tool to release the pins from the PCM connec-
tors Miller Tool #3638, you must use the Miller
Tool #3638 tool to release the connector pins
or harness and connector damage will occur.
Also a tool for probing connectors Miller Tool
#8815, you must use the Miller tool #8815 tool
to probe the PCM pins or harness and connec-
tor damage will occur.
The procedures contained in this manual include
all the specifications, instructions, and graphics
needed to diagnose 40/41TE Electronic Automatic
Transaxle (EATX) problems. The diagnostics in this
manual are based on the failure condition or symp-
tom being present at time of diagnosis.
When repairs are required, refer to the appropri-
ate volume of the service manual for the proper
removal and repair procedure.
Diagnostic procedures change every year. New
diagnostic systems may be added and/or carryover
systems may be enhanced. READ THIS MANUAL
BEFORE TRYING TO DIAGNOSE A VEHICLE
TROUBLE CODE. It is recommended that you
review the entire manual to become familiar with
all new and changed diagnostic procedures.
This book reflects many suggested changes from
readers of past issues. After using this book, if you
have any comments or recommendations, please fill
out the form atthe back of the book and mail itback
to us.
1.1 SYSTEM COVERAGE
This diagnostic procedures manual covers the
2004 PL vehicles equipped with a 40/41TE tran-
saxle.
1.2 SIX-STEP TROUBLESHOOTING
PROCEDURE
Diagnosis of the 40/41TE electronic transaxle is
done in six basic steps:
• verification of complaint
• verification of any related symptoms
• symptom analysis
• problem isolation
• repair of isolated problem
• verification of proper operation
2.0 IDENTIFICATION OF
SYSTEM
PL vehicles with a 4 speed automatic transmis-
sion can be visually identified. Notice that the
40/41TE transmission has all connectors for the
Transmission Solenoid/Pressure Switch Assembly,
Transmission Range Sensor, Input Speed Sensor
and Output Speed Sensor are located on the same
side of the transmission case. If the transmission
part number is required, refer to the Service Infor-
mation for transmission ID tag descriptions.
3.0 SYSTEM DESCRIPTION AND
FUNCTIONAL OPERATION
3.1 GENERAL DESCRIPTION
The 40/41TE electronic transaxle is a conven-
tional transaxle in that it uses hydraulically ap-
plied clutches to shift a planetary gear train. How-
ever, the electronic control system replaces many of
the mechanical and hydraulic components used in
conventional transmission valve bodies.
3.2 FUNCTIONAL OPERATION
The 40/41TE electronic transaxle has a fully
adaptive control system. The system performs it’s
functions based on continuous real-time sensor
feedback information. The control system automat-
ically adapts to changes in engine performance and
friction element variations to provide consistent
shift quality. The control system ensures that clutch
operation during upshifting and downshifting is
more responsive without increased harshness.
The PCM continuously checks for electrical prob-
lems, mechanical problems, and some hydraulic
problems. When a problem is sensed, the PCM
stores a diagnostic trouble code. Some of these codes
cause the transaxle to go into Limp-in or default
mode. While in this mode, electrical power is taken
away from the transaxle via the PCM, de-
energizing the transmission control relay, and tak-
ing power from the solenoid pack. When this hap-
pens, the only transaxle mechanical functions are:
Park and Neutral
1
GENERAL INFORMATION
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