Grand AM L4-144 2.4L DOHC VIN T SFI (1997)
Temperature Gauge: Description and Operation
The engine coolant temperature gage indicates the temperature of the engine coolant with the Ignition Switch in the "RUN" position. A Coolant
Temperature Sensor in the engine changes resistance with coolant temperature. As coolant temperature increases, the resistance of the sensor decreases.
The PCM reads the resistance value and assigns an appropriate value between 0 and 255 counts where it is transmitted to the IPC via serial data. The
IPC reads the count value and assigns a deflection value which causes the needle in the gages to turn. The gage will read from 37.8° C to 113° C (100° F
to 253° F).