Neon R/T L4-2.0L VIN F HO (2001)
TRANSMISSION RANGE SENSOR SWITCH STATES
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 "between gear" codes. This results in six codes which should never occur. These are called "invalid" 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.
TRANSMISSION TEMPERATURE SENSOR
The TRS has an integrated thermistor (Fig. 305) 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 "overheat" 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
predicted fluid temperature which is calculated from a combination of inputs:
-
Battery (ambient) temperature
-
Engine coolant temperature
-
In-gear run time since start-up
