2001 DODGE TOWN AND COUNTRY sensor

The TCM also compares the input speed signal and
the engine speed signal to determine the following:
²Torque converter clutch slippage
²Torque converter element speed ratio
REMOVAL
(1) Disconnect battery negative cable.
(2) If necessary, disconnect and cap off transmis-
sion oil cooler lines.(3) Disconnect input speed sensor connector.
(4) Unscrew and remove input speed sensor (Fig.
324).
(5) Inspect speed sensor o-ring (Fig. 325) and
replace if necessary.
INSTALLATION
(1) Verify o-ring is installed into position.
(2) Install and tighten input speed sensor to 27
N´m (20 ft. lbs.).
(3) Connect speed sensor connector.
(4) Connect battery negative cable.
Fig. 322 O-Ring Location
1 - INPUT SPEED SENSOR
2 - O-RING
Fig. 323 Sensor Relation to Input Clutch Hub
1 - INPUT SPEED SENSOR
2 - TRANSAXLE CASE
3 - INPUT CLUTCH HUB
Fig. 324 Input (Turbine) Speed Sensor
1 - INPUT SPEED SENSOR
Fig. 325 O-ring Location
1 - INPUT SPEED SENSOR
2 - O-RING
RSAUTOMATIC - 41TE21 - 279
SPEED SENSOR - INPUT (Continued)
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SPEED SENSOR - OUTPUT
DESCRIPTION
The Output Speed Sensor is a two-wire magnetic
pickup device that generates an AC signal as rotation
occurs. It is threaded into the transaxle case (Fig.
326) , sealed with an o-ring (Fig. 327), and is consid-
ered a primary input to the Transmission Control
Module (TCM).
OPERATION
The Output Speed Sensor provides information on
how fast the output shaft is rotating. As the rear
planetary carrier park pawl lugs pass by the sensor
coil (Fig. 328) , an AC voltage is generated and sent
to the TCM. The TCM interprets this information as
output shaft rpm.
The TCM compares the input and output speed
signals to determine the following:
²Transmission gear ratio
²Speed ratio error detection
²CVI calculation
VEHICLE SPEED SIGNAL
The vehicle speed signal is taken from the Output
Speed Sensor. The TCM converts this signal into a
pulse per mile signal and sends it to the PCM. The
PCM, in turn, sends the vehicle speed message
across the communication bus to the BCM. The BCM
sends this signal to the Instrument Cluster to dis-
play vehicle speed to the driver. The vehicle speed
signal pulse is roughly 8000 pulses per mile.
REMOVAL
(1) Disconnect battery negative cable.
(2) Raise vehicle on hoist.
(3) Disconnect output speed sensor connector.
(4) Unscrew and remove output speed sensor (Fig.
329).
(5) Inspect speed sensor o-ring (Fig. 330) and
replace if necessary.
Fig. 326 Output Speed Sensor
1 - OUTPUT SPEED SENSOR
Fig. 327 O-Ring Location
1 - OUTPUT SPEED SENSOR
2 - O-RING
Fig. 328 Sensor Relation to Planet Carrier Park Pawl
1 - OUTPUT SPEED SENSOR
2 - REAR PLANET CARRIER/OUTPUT SHAFT ASSEMBLY
3 - TRANSAXLE CASE
21 - 280 AUTOMATIC - 41TERS
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INSTALLATION
(1) Verify o-ring is installed into position (Fig.
330).
(2) Install and tighten input speed sensor to 27
N´m (20 ft. lbs.).
(3) Connect speed sensor connector.
(4) Connect battery negative cable.
TORQUE CONVERTER
DESCRIPTION
The torque converter (Fig. 331) is a hydraulic
device that couples the engine crankshaft to the
transmission. The torque converter consists of an
outer shell with an internal turbine, a stator, an
overrunning clutch, an impeller and an electronically
applied converter clutch. The converter clutch pro-
vides reduced engine speed and greater fuel economy
when engaged. Clutch engagement also provides
reduced transmission fluid temperatures. The con-
verter clutch engages in third gear. The torque con-
verter hub drives the transmission oil (fluid) pump.
The torque converter is a sealed, welded unit that
is not repairable and is serviced as an assembly.
CAUTION: The torque converter must be replaced if
a transmission failure resulted in large amounts of
metal or fiber contamination in the fluid. If the fluid
is contaminated, flush the fluid cooler and lines.
Fig. 329 Output Speed Sensor
1 - OUTPUT SPEED SENSOR
Fig. 330 O-ring Location
1 - OUTPUT SPEED SENSOR
2 - O-RING
Fig. 331 Torque Converter Assembly
1 - TURBINE
2 - IMPELLER
3 - HUB
4-STATOR
5 - CONVERTER CLUTCH DISC
6 - DRIVE PLATE
RSAUTOMATIC - 41TE21 - 281
SPEED SENSOR - OUTPUT (Continued)
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TRANSMISSION CONTROL
RELAY
DESCRIPTION
The transmission control relay (Fig. 340) is located
in the Intelligent Power Module (IPM), which is
located on the left side of the engine compartment
between the battery and left fender.
OPERATION
The relay is supplied fused B+ voltage, energized
by the TCM, and is used to supply power to the sole-
noid pack when the transmission is in normal oper-
ating mode. When the relay is ªoffº, no power is
supplied to the solenoid pack and the transmission is
in ªlimp-inº mode. After a controller reset (ignition
key turned to the ªrunº position or after cranking
engine), the TCM energizes the relay. Prior to this,
the TCM verifies that the contacts are open by check-
ing for no voltage at the switched battery terminals.
After this is verified, the voltage at the solenoid pack
pressure switches is checked. After the relay is ener-
gized, the TCM monitors the terminals to verify that
the voltage is greater than 3 volts.
TRANSMISSION RANGE
SENSOR
DESCRIPTION
The Transmission Range Sensor (TRS) is mounted
to the top of the valve body inside the transaxle and
can only be serviced by removing the valve body. The
electrical connector extends through the transaxle
case (Fig. 341) .
The Transmission Range Sensor (TRS) has four
switch contacts that monitor shift lever position and
send the information to the TCM.
The TRS also has an integrated temperature sen-
sor (thermistor) that communicates transaxle tem-
perature to the TCM and PCM (Fig. 342) .
OPERATION
The Transmission Range Sensor (TRS) (Fig. 341)
communicates shift lever position (SLP) to the TCM
as a combination of open and closed switches. Each
shift lever position has an assigned combination of
switch states (open/closed) that the TCM receives
from four sense circuits. The TCM interprets this
information and determines the appropriate trans-
axle gear position and shift schedule.
Fig. 340 Transmission Control Relay Location
1 - TRANSMISSION CONTROL RELAY
2 - LEFT FENDER
3 - INTELLIGENT POWER MODULE (IPM)
4 - BATTERYFig. 341 Transmission Range Sensor (TRS)
Location
1 - TRANSMISSION RANGE SENSOR
RSAUTOMATIC - 41TE21 - 287
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Since there are four switches, there are 16 possible
combinations of open and closed switches (codes).
Seven of these codes are related to gear position and
three are recognized as ªbetween gearº codes. This
results in six codes which should never occur. These
are called ªinvalidº codes. An invalid code will result
in a DTC, and the TCM will then determine the shift
lever position based on pressure switch data. This
allows reasonably normal transmission operation
with a TRS failure.
TRS SWITCH STATES
SLP T42 T41 T3 T1
PCL CL CL OP
RCL OP OP OP
NCL CL OP CL
ODOP OP OP CL
3OP OP CL OP
LCL OP CL CL
TRANSMISSION TEMPERATURE SENSOR
The TRS has an integrated thermistor (Fig. 342)
that the TCM uses to monitor the transmission's
sump temperature. Since fluid temperature can
affect transmission shift quality and convertor lock
up, the TCM requires this information to determine
which shift schedule to operate in. The PCM also
monitors this temperature data so it can energize the
vehicle cooling fan(s) when a transmission ªoverheatº
condition exists. If the thermistor circuit fails, the
TCM will revert to calculated oil temperature usage.
CALCULATED TEMPERATURE
A failure in the temperature sensor or circuit will
result in calculated temperature being substituted for
actual temperature. Calculated temperature is a pre-
dicted fluid temperature which is calculated from a
combination of inputs:
²Battery (ambient) temperature
²Engine coolant temperature
²In-gear run time since start-up
REMOVAL
(1) Remove valve body assembly from transaxle.
(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTO-
MATIC - 41TE/VALVE BODY - REMOVAL)
(2) Remove transmission range sensor retaining
screw and remove sensor from valve body (Fig. 343).
(3) Remove TRS from manual shaft.
INSTALLATION
(1) Install transmission range sensor (TRS) to the
valve body and torque retaining screw (Fig. 343) to 5
N´m (45 in. lbs.).
(2) Install valve body to transaxle. (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC -
41TE/VALVE BODY - INSTALLATION)
Fig. 342 Transmission Temperature Sensor
1 - TRANSMISSION RANGE SENSOR
2 - TEMPERATURE SENSOR
Fig. 343 Remove Transmission Range Sensor
1 - TRANSMISSION RANGE SENSOR
2 - MANUAL VALVE CONTROL PIN
3 - RETAINING SCREW
21 - 288 AUTOMATIC - 41TERS
TRANSMISSION RANGE SENSOR (Continued)
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DISASSEMBLY
NOTE: If valve body assembly is being recondi-
tioned, the TCM Quick Learn Procedure must be
performed. (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/TRANSMISSION CONTROL
MODULE - STANDARD PROCEDURE)
(1) Remove manual shaft seal (Fig. 351).(2) Remove Transmission Range Sensor retaining
screw (Fig. 352).
(3) Remove Manual Shaft/Rooster Comb and
Transmission Range Sensor (Fig. 353).
Fig. 350 Valve Body Removal/Installation
1 - VALVE BODY
Fig. 351 Manual Shaft Seal
1 - SEAL
2 - MANUAL SHAFT
Fig. 352 Remove Transmission Range Sensor
1 - TRANSMISSION RANGE SENSOR
2 - MANUAL VALVE CONTROL PIN
3 - RETAINING SCREW
Fig. 353 Manual Shaft/Rooster Comb and
Transmission Range Sensor
1 - TRANSMISSION RANGE SENSOR
2 - MANUAL SHAFT
3 - ROOSTER COMB
21 - 292 AUTOMATIC - 41TERS
VALVE BODY (Continued)
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(14) Install Manual Shaft/Rooster Comb and
Transmission Range Sensor (Fig. 379).
(15) Make sure Manual Valve control pin is con-
tained within the rooster comb slot (Fig. 380). Install
Transmission Range Sensor retaining screw (Fig.
380) and torque to 5 N´m (45 in. lbs.).(16) Install manual shaft seal (Fig. 381).
INSTALLATION
NOTE: If valve body assembly is being replaced or
reconditioned, it is necessary to perform the TCM
Quick Learn Procedure. (Refer to 8 - ELECTRICAL/
ELECTRONIC CONTROL MODULES/TRANSMISSION
CONTROL MODULE - STANDARD PROCEDURE)
(1) Install valve body assembly to transaxle (Fig.
382). Install and torque valve body-to-transaxle case
bolts (Fig. 383) to 12 N´m (105 in. lbs.).
Fig. 379 Install Manual Shaft/Rooster Comb and
Transmission Range Sensor
1 - TRANSMISSION RANGE SENSOR
2 - MANUAL SHAFT
3 - ROOSTER COMB
Fig. 380 Install Transmission Range Sensor
Retaining Screw
1 - TRANSMISSION RANGE SENSOR
2 - MANUAL VALVE CONTROL PIN
3 - RETAINING SCREW
Fig. 381 Manual Shaft Seal
1 - SEAL
2 - MANUAL SHAFT
Fig. 382 Valve Body Removal/Installation
1 - VALVE BODY
RSAUTOMATIC - 41TE21 - 301
VALVE BODY (Continued)
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(2) Install transaxle oil filter (Fig. 384). Inspect
the o-ring and replace if necessary.
(3) Ensure the transaxle oil pan and transaxle
case sealing surfaces are clean and dry. Install an
1/8º bead of MopartSilicone Rubber Adhesive Seal-ant to the oil pan and install (Fig. 385). Torque oil
pan-to-transaxle case bolts (Fig. 386) to 19 N´m (165
in. lbs.).
(4) Lower vehicle.
(5) Connect transmission range sensor connector.
(6) Install manual valve lever to manual shaft.
(7) Install gearshift cable to manual valve lever.
(8) Connect battery negative cable.
(9) Fill transaxle with MopartATF +4 Transmis-
sion fluid. (Refer to 21 - TRANSMISSION/TRANS-
AXLE/AUTOMATIC - 41TE/FLUID - STANDARD
PROCEDURE)
Fig. 383 Valve Body Attaching Bolts
1 - VALVE BODY ATTACHING BOLTS (18)
2 - VALVE BODY
Fig. 384 Oil Filter
1 - OIL FILTER
2 - O-RING
Fig. 385 Oil Pan
1 - OIL PAN
2 - 1/8 INCH BEAD OF RTV SEALANT
3 - OIL FILTER
Fig. 386 Oil Pan Bolts
1 - OIL PAN BOLTS (USE RTV UNDER BOLT HEADS)
21 - 302 AUTOMATIC - 41TERS
VALVE BODY (Continued)
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