Reductant Temperature Sensor

The reductant temperature sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the temperature increases, and resistance increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical voltage signals to the PCM corresponding to temperature.

The reductant temperature sensor provides feedback to the PCM, which controls the reductant heaters to keep the reductant in a liquid state during low ambient temperatures. The reductant temperature sensor is integral to the reductant heater and sender assembly. For additional information on the reductant temperature sensor, refer to Reductant Heater And Sender Assembly  description in this article.