A faulty sensor can lead to a range of problems developing, including overheating and poor engine performance. Like any component under the bonnet, coolant temperature sensors can develop faults over time. How to Spot a Faulty Coolant Temperature Sensor This information is also used to send an accurate reading of the engine temperature to a gauge on the dashboard. The ECU uses this reading to calculate the coolant temperature, and from there adjusts the fuel injection, fuel mix, and ignition timing, and controls when the electric cooling fan is switched on and off. The resistance of the sensor varies with temperature, this is how the ECU can monitor temperature changes. To get an accurate reading of the current engine temperature, the ECU sends a regulated voltage to the CTS. The sensor works with the vehicle’s ECU, continually monitoring the coolant temperature to make sure the engine is running at the optimum temperature. ![]() What is a Coolant Temperature Sensor and How Does It Work?Ī coolant temperature sensor (CTS) (also known as an ECT sensor or ECTS (engine coolant temperature sensor) is used to measure the temperature of the coolant/antifreeze mix in the cooling system, giving an indication of how much heat the engine is giving off.
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