The (ECT) Engine Coolant Temperature Sensor is a temperature-variable resistor, which usually has a negative temperature coefficient.
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The sensor works with the vehicle’s ECU, continually monitoring the coolant temperature. Consequently, making sure the engine is running at the optimum temperature.
So, To get an accurate reading of the current engine coolant temperature, the ECU sends a voltage to the CTS. The resistance of the sensor varies with temperature, this is how the ECU can monitor temperature changes.
Like any component under the hood, engine coolant temperature sensors can develop faults over time. Consequently, A faulty sensor can lead to a range of problems, including overheating and poor engine performance. That’s why it’s important to know how to spot the signs of a faulty or failing temperature sensor.
Start by having a look at the unit itself to check its condition, as sensors/gaskets/connectors can develop cracks. Consequently, with extended use and continual temperature cycling. While a visual check can help to diagnose some faults, not all problems with a CTS show visible symptoms. Finally, Replacing a Engine Coolant Temperature sensor is a simple process.