Grand Caravan V6-3.8L VIN L (2007)
TRS Switch States
TRANSMISSION TEMPERATURE SENSOR
The TTS has an integrated thermistor that the PCM/TCM uses to monitor the transmission's sump temperature. Since fluid temperature can affect
transmission shift quality and convertor lock up, the PCM/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 "overheat" condition exists. If the thermistor circuit fails,
the PCM/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
predicted fluid temperature which is calculated from a combination of inputs:
-
Battery (ambient) temperature
-
Engine coolant temperature
-
In-gear run time since start-up