Sensor, Coolant Temperature: Description: Diesel

WARNING: This page is about a different car, the 2016 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Engine Coolant Temperature (ECT) Sensor

Courtesy of CHRYSLER GROUP, LLC

The Engine Coolant Temperature (ECT) sensor (1) is located on the upper portion of the water pump housing by the thermostat. The Engine Coolant Temperature (ECT) sensor is used to sense engine coolant temperature.
The ECT sensor is a two-wire Negative Thermal Coefficient (NTC) sensor. Meaning, as engine coolant temperature increases, resistance (voltage) in the sensor decreases. As temperature decreases, resistance (voltage) in the sensor increases.