Grand Caravan V6-3.8L VIN L (2007)
Figure 2 Transmission Temperature Sensor
The TRS (1) (Figure 2)also has an integrated temperature sensor (thermistor) (2) that communicates transaxle temperature to the TCM and PCM.
Operation
OPERATION
The Transmission Range Sensor (TRS) communicates Shift Lever Position (SLP) to the PCM/TCM as a combination of open and closed switches. Each
shift lever position has an assigned combination of switch states (open/closed) that the PCM/TCM receives from four sense circuits. The PCM/TCM
interprets this information and determines the appropriate transaxle gear position and shift schedule.
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 PCM/TCM will then determine the shift lever position based on pressure switch data. This allows reasonably normal
transmission operation with a TRS failure.
