L300 V6-3.0L VIN R (2001)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
Coolant Temp Gauge
The ECM controls the coolant temperature gauge by sending gauge position messages to the BCM over the CAN link based on ECT sensor readings.
The BCM averages the temperature over time allowing the gauge to move slowly and remain in a relatively stable position as temperature varies. The
BCM then sends the averaged information to the I/P cluster over the link to position the gauge.