2003 CHRYSLER CARAVAN Service Manual

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Page 1561 of 2177

CHRYSLER CARAVAN 2003 Service Manual SYNCHRONIZER
DESCRIPTION
The T850 transaxle uses two styles of synchronizer
assemblies; a conventional single-cone style is used
for the 5th/Reverse and 3rd/4th applications (Fig.
277), and a dual-con

Page 1562 of 2177

CHRYSLER CARAVAN 2003 Service Manual VEHICLE SPEED SENSOR
REMOVAL
(1) Raise vehicle on hoist.
(2)
Disconnect the speed sensor connector (Fig. 279).
CAUTION: Clean area around speed sensor before
removing to prevent dirt from entering the

Page 1563 of 2177

CHRYSLER CARAVAN 2003 Service Manual 41TE AUTOMATIC TRANSAXLE
TABLE OF CONTENTS
page page
41TE AUTOMATIC TRANSAXLE
DESCRIPTION........................117
OPERATION..........................119
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING

41TE AUTOMATIC TRANSAXLE
TABLE OF CONTENTS
page page
41TE AUTOMATIC TRANSAXLE
DESCRIPTION........................117
OPERATION..........................119
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - 41TE
TRANSAXLE GENERAL DIAGNOSIS......119
DIAGNOSIS AND TESTING - ROAD TEST . . 119
DIAGNOSIS AND TESTING - HYDRAULIC
PRESSURE TESTS...................120
DIAGNOSIS AND TESTING - CLUTCH AIR
PRESSURE TESTS...................122
DIAGNOSIS AND TESTING - TORQUE
CONVERTER HOUSING FLUID LEAKAGE . . 123
REMOVAL............................124
DISASSEMBLY........................125
ASSEMBLY...........................144
INSTALLATION........................166
SCHEMATICS AND DIAGRAMS
41TE TRANSAXLE HYDRAULIC
SCHEMATICS.......................169
SPECIFICATIONS - 41TE TRANSAXLE......181
SPECIAL TOOLS
41TE AUTOMATIC TRANSAXLE.........183
ACCUMULATOR
DESCRIPTION........................188
OPERATION..........................189
AUTOSTICK SWITCH
DESCRIPTION........................189
OPERATION..........................189
DRIVING CLUTCHES
DESCRIPTION........................190
OPERATION..........................190
FINAL DRIVE
DISASSEMBLY........................190
ASSEMBLY...........................195
ADJUSTMENTS
ADJUSTMENT - DIFFERENTIAL BEARING
PRELOAD..........................199
FLUID
STANDARD PROCEDURE
FLUID LEVEL AND CONDITION CHECK . . . 201
STANDARD PROCEDURE - FLUID AND
FILTER SERVICE.....................203
GEAR SHIFT CABLE
REMOVAL............................204
INSTALLATION........................205
ADJUSTMENTS
GEARSHIFT CABLE ADJUSTMENT.......206HOLDING CLUTCHES
DESCRIPTION........................207
OPERATION..........................207
INPUT CLUTCH ASSEMBLY
DISASSEMBLY........................208
ASSEMBLY...........................216
OIL PUMP
DESCRIPTION........................230
OPERATION..........................230
DISASSEMBLY........................230
ASSEMBLY...........................232
PLANETARY GEARTRAIN
DESCRIPTION........................232
OPERATION..........................232
SEAL - OIL PUMP
REMOVAL............................232
INSTALLATION........................233
SHIFT INTERLOCK SOLENOID
DESCRIPTION........................233
OPERATION..........................233
DIAGNOSIS AND TESTING - BRAKE/
TRANSMISSION SHIFT INTERLOCK
SOLENOID..........................235
REMOVAL............................235
INSTALLATION........................236
SOLENOID/PRESSURE SWITCH ASSY
DESCRIPTION........................237
OPERATION..........................237
REMOVAL............................238
INSTALLATION........................239
SPEED SENSOR - INPUT
DESCRIPTION........................239
OPERATION..........................240
REMOVAL............................240
INSTALLATION........................240
SPEED SENSOR - OUTPUT
DESCRIPTION........................241
OPERATION..........................241
REMOVAL............................241
INSTALLATION........................242
TORQUE CONVERTER
DESCRIPTION........................242
OPERATION..........................245
REMOVAL............................247
INSTALLATION........................247
TRANSMISSION CONTROL RELAY
DESCRIPTION........................247
OPERATION..........................248
21 - 116 41TE AUTOMATIC TRANSAXLERS
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Page 1564 of 2177

CHRYSLER CARAVAN 2003 Service Manual TRANSMISSION RANGE SENSOR
DESCRIPTION........................248
OPERATION..........................248
REMOVAL............................249
INSTALLATION........................249
TRD LINK
DESCRIPT

TRANSMISSION RANGE SENSOR
DESCRIPTION........................248
OPERATION..........................248
REMOVAL............................249
INSTALLATION........................249
TRD LINK
DESCRIPTION........................249
OPERATION..........................249VALVE BODY
DESCRIPTION........................250
OPERATION..........................250
REMOVAL............................251
DISASSEMBLY........................252
ASSEMBLY...........................257
INSTALLATION........................262
41TE AUTOMATIC
TRANSAXLE
DESCRIPTION
The 41TE (Fig. 1) is a four-speed transaxle that is
a conventional hydraulic/mechanical assembly with
an integral differential, and is controlled with adap-
tive electronic controls and monitors. The hydraulic
system of the transaxle consists of the transaxle
fluid, fluid passages, hydraulic valves, and various
line pressure control components. An input clutch
assembly which houses the underdrive, overdrive,
and reverse clutches is used. It also utilizes separate
holding clutches: 2nd/4th gear and Low/Reverse. The
primary mechanical components of the transaxle con-
sist of the following:
²Three multiple disc input clutches
²Two multiple disc holding clutches
²Four hydraulic accumulators
²Two planetary gear sets
²Hydraulic oil pump
²Valve body
²Solenoid/Pressure switch assembly
²Integral differential assemblyControl of the transaxle is accomplished by fully
adaptive electronics. Optimum shift scheduling is
accomplished through continuous real-time sensor
feedback information provided to the Powertrain
Control Module (PCM) or Transmission Control Mod-
ule (TCM).
The PCM/TCM is the heart of the electronic control
system and relies on information from various direct
and indirect inputs (sensors, switches, etc.) to deter-
mine driver demand and vehicle operating condi-
tions. With this information, the PCM/TCM can
calculate and perform timely and quality shifts
through various output or control devices (solenoid
pack, transmission control relay, etc.).
The PCM/TCM also performs certain self-diagnos-
tic functions and provides comprehensive information
(sensor data, DTC's, etc.) which is helpful in proper
diagnosis and repair. This information can be viewed
with the DRB scan tool.
RS41TE AUTOMATIC TRANSAXLE21 - 117
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Page 1565 of 2177

CHRYSLER CARAVAN 2003 Service Manual TRANSAXLE IDENTIFICATION
The 41TE transaxle is identified by a barcode label
that is fixed to the transaxle case as shown in (Fig.
2).The label contains a series of digits that can be
translated into

Page 1566 of 2177

CHRYSLER CARAVAN 2003 Service Manual If the tag is not legible or missing, the ªPKº num-
ber, which is stamped into the transaxle case behindthe transfer gear cover, can be referred to for identi-
fication. This number differs slightly

If the tag is not legible or missing, the ªPKº num-
ber, which is stamped into the transaxle case behindthe transfer gear cover, can be referred to for identi-
fication. This number differs slightly in that it con-
tains the entire transaxle part number, rather than
the last three digits.
OPERATION
Transmission output is directed to an integral dif-
ferential by a transfer gear system in the following
input-to-output ratios:
First...............................2.84 : 1
Second.............................1.57 : 1
Third..............................1.00 : 1
Overdrive...........................0.69 : 1
Reverse............................2.21 : 1
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - 41TE TRANSAXLE
GENERAL DIAGNOSIS
NOTE: Before attempting any repair on a 41TE four-
speed automatic transaxle, check for diagnostic
trouble codes (DTC's) using the DRB scan tool.
Refer to the Transmission Diagnostic Procedures
Manual.
Transaxle malfunctions may be caused by these
general conditions:
²Poor engine performance
²Improper adjustments
²Hydraulic malfunctions
²Mechanical malfunctions
²Electronic malfunctions
Diagnosis of these problems should always begin
by checking the easily accessible variables: fluid level
and condition, gearshift cable adjustment. Then per-
form a road test to determine if the problem has been
corrected or that more diagnosis is necessary. If the
problem persists after the preliminary tests and cor-
rections are completed, hydraulic pressure checks
should be performed.
DIAGNOSIS AND TESTING - ROAD TEST
Prior to performing a road test, verify that the
fluid level, fluid condition, and linkage adjustment
have been approved.
During the road test, the transaxle should be oper-
ated in each position to check for slipping and any
variation in shifting.
If the vehicle operates properly at highway speeds,
but has poor acceleration, the converter stator over-
running clutch may be slipping. If acceleration is nor-
mal, but high throttle opening is needed to maintain
highway speeds, the converter stator clutch may
have seized. Both of these stator defects require
Fig. 2 Transaxle Identification Label
1 - IDENTIFICATION LABEL
Fig. 3 Identification Label Breakdown
1 - T=TRACEABILITY
2 - SUPPLIER CODE (PK=KOKOMO)
3 - COMPONENT CODE (TK=KOKOMO TRANSMISSION)
4 - BUILD DAY (344=DEC. 9)
5 - BUILD YEAR (9=1999)
6 - LINE/SHIFT CODE (3=3RD SHIFT)
7 - BUILD SEQUENCE NUMBER
8 - LAST THREE OF P/N
9 - NIK
10 - TRANSAXLE PART NUMBER
11 - P=PART NUMBER
RS41TE AUTOMATIC TRANSAXLE21 - 119
41TE AUTOMATIC TRANSAXLE (Continued)
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Page 1567 of 2177

CHRYSLER CARAVAN 2003 Service Manual replacement of the torque converter and thorough
transaxle cleaning.
Slipping clutches can be isolated by comparing the
ªElements in Useº chart with clutch operation
encountered on a road test. This

replacement of the torque converter and thorough
transaxle cleaning.
Slipping clutches can be isolated by comparing the
ªElements in Useº chart with clutch operation
encountered on a road test. This chart identifieswhich clutches are applied at each position of the
selector lever.
A slipping clutch may also set a DTC and can be
determined by operating the transaxle in all selector
positions.
ELEMENTS IN USE AT EACH POSITION OF SELECTOR LEVER
Shift Lever
PositionINPUT CLUTCHES HOLDING CLUTCHES
Underdrive Overdrive Reverse 2/4 Low/Reverse
P - PARKX
R - REVERSE X X
N - NEUTRALX
OD -
OVERDRIVE
First XX
Second X X
Direct X X
Overdrive X X
D - DRIVE*
First XX
Second X X
Direct X X
L - LOW*
First XX
Second X X
Direct X X
* Vehicle upshift and downshift speeds are increased when in these selector positions.
The process of elimination can be used to detect
any unit which slips and to confirm proper operation
of good units. Road test analysis can diagnose slip-
ping units, but the cause of the malfunction cannot
be determined. Practically any condition can be
caused by leaking hydraulic circuits or sticking
valves.
DIAGNOSIS AND TESTING - HYDRAULIC
PRESSURE TESTS
Pressure testing is a very important step in the
diagnostic procedure. These tests usually reveal the
cause of most hydraulic transaxle problems.
Before performing pressure tests, be certain that
fluid level and condition, and shift cable adjustments
have been checked and approved. Fluid must be at
operating temperature (150 to 200 degrees F.).
Install an engine tachometer, raise vehicle on hoist
which allows front wheels to turn, and position
tachometer so it can be read.Attach 300 psi gauge (C-3293SP) to port(s)
required for test(s) being conducted. Use adapter set
L-4559 to adapt gauge(s) to transaxle.
Test port locations are shown in (Fig. 4).
TEST ONE-SELECTOR IN LOW (1st GEAR)
(1) Attach pressure gauge to the low/reverse clutch
tap.
(2) Move selector lever to the (L) position.
(3) Allow vehicle wheels to turn and increase
throttle opening to achieve an indicated vehicle speed
to 20 mph.
(4) Low/reverse clutch pressure should read 115 to
145 psi.
(5) This test checks pump output, pressure regula-
tion and condition of the low/reverse clutch hydraulic
circuit and shift schedule.
21 - 120 41TE AUTOMATIC TRANSAXLERS
41TE AUTOMATIC TRANSAXLE (Continued)
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Page 1568 of 2177

CHRYSLER CARAVAN 2003 Service Manual TEST TWO-SELECTOR IN DRIVE (2nd GEAR)
NOTE: This test checks the underdrive clutch
hydraulic circuit as well as the shift schedule.
(1) Attach gauge to the underdrive clutch tap.
(2) Move selector lev

TEST TWO-SELECTOR IN DRIVE (2nd GEAR)
NOTE: This test checks the underdrive clutch
hydraulic circuit as well as the shift schedule.
(1) Attach gauge to the underdrive clutch tap.
(2) Move selector lever to the 3 position.
(3) Allow vehicle wheels to turn and increase
throttle opening to achieve an indicated vehicle speed
of 30 mph.
(4) In second gear the underdrive clutch pressure
should read 110 to 145 psi.
TEST TWO A±SELECTOR IN OD (4th Gear)
NOTE: This test checks the underdrive clutch
hydraulic circuit as well as the shift schedule.
(1) Attach gauge to the underdrive clutch tap.
(2) Move selector lever to the (OD) position.
(3) Allow wheels to rotate freely and increase
throttle opening to achieve an indicated speed of 40
mph.
(4) Underdrive clutch pressure should read below
5 psi. If not, then either the solenoid assembly or
PCM/TCM is at fault.
TEST THREE-OVERDRIVE CLUTCH CHECK (3rd and
2nd Gear)
(1) Attach gauge to the overdrive clutch tap.
(2) Move selector lever to the (OD) position.
(3) Allow vehicle wheels to turn and increase
throttle opening to achieve an indicated vehicle speed
of 20 mph. Vehicle should be in 3rd gear.(4) Overdrive clutch pressure should read 74 to 95
psi.
(5) Move selector lever to the (3) position and
increase indicated vehicle speed to 30 mph.
(6) The vehicle should be in second gear and over-
drive clutch pressure should be less than 5 psi.
(7) This test checks the overdrive clutch hydraulic
circuit as well as the shift schedule.
TEST FOUR-SELECTOR IN OVERDRIVE (4th Gear)
(1) Attach gauge to the 2/4 clutch tap.
(2) Move selector lever to the (OD) position.
(3) Allow vehicle front wheels to turn and increase
throttle opening to achieve an indicated vehicle speed
of 30 mph. Vehicle should be in 4th gear.
(4) The 2/4 clutch pressure should read 75 to 95
psi.
(5) This test checks the 2/4 clutch hydraulic cir-
cuit.
TEST FIVE-SELECTOR IN OVERDRIVE (4th Gear-CC
on)
(1) Attach gauge to the torque converter clutch off
pressure tap.
(2) Move selector lever to the (OD) position.
(3) Allow vehicle wheels to turn and increase
throttle opening to achieve an indicated vehicle speed
of 50 mph. Vehicle should be in 4th gear, CC on.
CAUTION: Both wheels must turn at the same
speed.
(4) Torque converter clutch off pressure should be
less than 5 psi.
(5) This test checks the torque converter clutch
hydraulic circuit.
TEST SIX-SELECTOR IN REVERSE
(1) Attach gauges to the reverse and LR clutch
tap.
(2) Move selector lever to the (R) position.
(3) Read reverse clutch pressure with output sta-
tionary (foot on brake) and throttle opened to achieve
1500 rpm.
(4) Reverse and LR clutch pressure should read
165 to 235 psi.
(5) This test checks the reverse clutch hydraulic
circuit.
TEST RESULT INDICATIONS
(1) If proper line pressure is found in any one test,
the pump and pressure regulator are working prop-
erly.
(2) Low pressure in all positions indicates a defec-
tive pump, a clogged filter, or a stuck pressure regu-
lator valve.
Fig. 4 Pressure Taps
1 - OVERDRIVE CLUTCH
2 - TORQUE CONVERTER OFF
3 - LOW/REVERSE CLUTCH
4 - 2/4 CLUTCH
5 - REVERSE CLUTCH
6 - UNDERDRIVE CLUTCH
RS41TE AUTOMATIC TRANSAXLE21 - 121
41TE AUTOMATIC TRANSAXLE (Continued)
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