Chrysler 300M 2002 Service Manual page 2800

1.0 INTRODUCTION
New for 2002 model year, LH vehicles will inte-
grate the Transmission Control Module and Power-
train Control Module into a single control module.
This new module is the Next Generation Controller
for DaimlerChrysler and wil be referred to as the
Powertrain Control Module (PCM). The Transmis-
sion Control System is part of the Powertrain
Control Module.
New Diagnostics procedures and New DTC num-
bers are some of the changes you will see which
reflect the new combined module technology. The
PCM will have four color coded connectors C1
through C4, (C1-BLK, C2-GRAY, C3-WHITE, C4-
GREEN), each PCM connector will have 38 pins
each. Two new tools are used for probing and
repairing the New PCM connectors. A New tool to
release the pins from the PCM connectors Miller
#3638 is introduced, you must use the Miller tool
#3638 tool to release the connector pins or harness
and connector damage will occur. Also a New tool
for probing connectors Miller #8815 is introduced,
you must use the Miller tool #8815 tool to probe the
PCM pins or harness and connector damage will
occur. There is also a new Verification test and
module replacement procedure for the new PCM.
The procedures contained in this manual include
all the specifications, instructions, and graphics
needed to diagnose 42LE 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 appropriate
volume of the service manual for the proper re-
moval 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 at the back of the book and mail it back
to us.
1.1 SYSTEM COVERAGE
This diagnostic procedures manual covers all
2002 LH and 300M vehicles equipped with a 42LE
transaxle.
GENERAL INFORMATION
1.2 SIX-STEP TROUBLESHOOTING
PROCEDURE
Diagnosis of the 42LE 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
All LH and 300M vehicles are equipped with a 4
speed transmission. The Solenoid/Pressure switch
is located on the right side of the transmission case,
The Transmission Range Sensor, Input speed sen-
sor and Output speed sensor are located on the left
or same side of the transmission case. Refer to the
Service Information for transmission ID tag de-
scriptions.
3.0 SYSTEM DESCRIPTION AND
FUNCTIONAL OPERATION
3.1 GENERAL DESCRIPTION
The 42LE electronic transaxle is a conventional
transaxle in that it uses hydraulically applied
clutches to shift a planetary gear train. However,
the electronic control system replaces many of the
mechanical and hydraulic components used in con-
ventional transmission valve bodies.
3.2 FUNCTIONAL OPERATION
The 42LE electronic transaxle has a fully adap-
tive control system. The system performs its func-
tions based on continuous real-time sensor feedback
information. The control system automatically
adapts to changes in engine performance and fric-
tion 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-
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