Installation; Transmission Temperature Sensor Description; Operation - Chrysler Vehicle User Manual

21 - 176 AUTOMATIC TRANSMISSION - 42RLE
TRANSMISSION RANGE SENSOR (Continued)
(4) Remove manual shaft/TRS retaining screw
(Fig. 251).
Fig. 251 Manual Shaft Retaining Screw
1 - SCREW
2 - TRS
(5) Slide TRS off of manual valve shaft.

INSTALLATION

(1) Install the TRS to the manual shaft. Make sure
TRS locating pin rests in manual valve bore slot.
(2) Install the TRS/manual shaft retaining screw
and torque to 5 N·m (45 in. lbs.) torque.
(3) Install the manual shaft seal.
(4) Install valve body to the transmission.
TRANSMISSION
TEMPERATURE SENSOR
DESCRIPTION
The transmission temperature sensor (Fig. 252) is
located in the transmission range sensor and commu-
nicates transmission sump temperature to the PCM.
Fig. 252 Transmission Temperature Sensor
1 - TRANSMISSION RANGE SENSOR
2 - TEMPERATURE SENSOR

OPERATION

The TRS has an integrated thermistor that the
PCM uses to monitor the transmission's sump tem-
perature. Since fluid temperature can affect trans-
mission shift quality and convertor lock up, the PCM
requires this information to determine which shift
schedule to operate in. The PCM also monitors this
temperature data so it can energize the vehicle cool-
ing fan(s) when a transmission "overheat" condition
exists. If the thermistor circuit fails, the PCM 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:
• Battery (ambient) temperature
• Engine coolant temperature
• In-gear run time since start-up
TJ