Dakota 2WD V8-4.7L VIN J (2005)
Transmission Temperature Sensor/Switch: Description and Operation
Automatic Transmission 545RFE
SENSOR - TRANSMISSION TEMPERATURE
DESCRIPTION
The transmission temperature sensor is a thermistor that is integral to the Transmission Range Sensor (TRS).
OPERATION
The transmission temperature sensor is used by the TCM, to sense the temperature of the fluid in the sump. Since fluid temperature can affect
transmission shift quality and converter lock up, the TCM, requires this information to determine which shift schedule to operate in.
Calculated Temperature
A failure in the temperature sensor or circuit will result in calculated temperature being substituted for actual temperature. Calculated temperature is a
predicted fluid temperature which is calculated from a combination of inputs:
-
Battery (ambient) temperature
-
Engine coolant temperature
-
In-gear run time since start-up
