1.0
INTRODUCTION
IMPORTANT
The 2005 RS/RG model year vehicles will use
both the standard EATX controlled transmission
and the NGC controlled transmission based on the
available powertrain combinations. You will need to
identify which controller is being used on the vehi-
cle that requires service.
•
Diesel engines use a Transmission Control mod-
ule (TCM) with an Engine Control Module
(ECM).
•
Gas engines use the Powertrain Control Module
(PCM) NGC controller.
PCM - NGC CONTROLLER
RS/RG vehicles use an integrated Transmission
Control Module and Powertrain Control Module
into a single control module. This module is the
Next Generation Controller (NGC) for Daimler-
Chrysler and is referred to as the Powertrain Con-
trol Module (PCM). The PCM is located in the left
front wheel well.
The PCM has four color coded connectors, C1
through C4, (C1-BLK, C2-GRAY, C3-WHITE, C4-
GREEN), each PCM connector will have 38 pins.
Miller tool #3638, and Miller tool #8815 are used for
probing and repairing the PCM connectors. Miller
tool #3638 is designed to release the pins from the
PCM harness connectors. You must use the Miller
tool #3638 to release the harness connector termi-
nals or harness connector or terminal damage will
occur. Miller tool #8815 was designed for probing
the PCM harness connectors. You must use Miller
tool #8815 for probing the PCM terminals or dam-
age to the terminal will occur resulting in a poor
terminal to pin connection.
TCM - EATX CONTROLLER
RS/RG vehicles use a Transmission Control Mod-
ule (TCM) in Diesel powertrain applications. The
TCM can be identified by the presence of a single 60
way harness connector. This stand alone TCM mod-
ule is the used to control the transmission functions
and is located in the left front wheel well. The
Engine Control Module (ECM) which controls the
engine functions is separate from the Transmission
Control module.
The procedures contained in this manual include
all of the specifications, instructions, and graphics
needed to diagnose:
•
41TE TCM (EATX) Electronic Automatic Trans-
mission problems
•
40TE/41TE PCM (NGC) Electronic Automatic
Transmission problems
The diagnostics in this manual are based on the
failure condition or symptom being present at the
time of diagnosis. When repairs are required, refer
to the appropriate volume of the service manual for
the proper removal and repair procedure. Diagnos-
tic 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 diagnos-
tic procedures. This book reflects many suggested
changes from readers of past issues. After using this
book, if you have any comments or recommenda-
tions, please fill out the form at the back of the book
and mail it back to us.
1.1
SYSTEM COVERAGE
The diagnostic procedure manual covers all
RS/RG vehicles equipped with an electronic tran-
saxle.
1.2
SIX -STEP TROUBLESHOOTING
PROCEDURE
Diagnosis of the 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
The 40TE/41TE Transmission family can be iden-
tified through a visual inspection. Confirm the
presence of a Solenoid/Pressure Switch Assembly,
Transmission Range Sensor, Input Speed Sensor
and Output Speed Sensor all located on the same
side of the transmission case. Refer to the Service
Information for transmission ID tag descriptions.
3.0
SYSTEM DESCRIPTION AND
FUNCTIONAL OPERATION
3.1
GENERAL DESCRIPTION
The electronic transaxle is a conventional tran-
saxle in that it uses hydraulically applied clutches
to shift a planetary gear train. However, the elec-
tronic control system replaces many of the mechan-
ical and hydraulic components used in conventional
transmission valve bodies.
1
GENERAL INFORMATION