The coolant temperature sensor is located in the engine block's water jacket or in the coolant pipeline and is in direct contact with the fluid to monitor the engine's coolant temperature. The ECU adjusts the fuel injection and ignition times after receiving the temperature signal.
The coolant temperature sensor is a negative temperature coefficient resistance meter NTC, and the inside is made up of a negative temperature coefficient semiconductor thermistor.
The resistance of the thermistor decreases as the temperature of the engine coolant rises, while it rises as the temperature of the engine coolant rises. As a consequence, when the temperature of the engine coolant varies, the sensor's output voltage adjusts proportionally.
The coolant temperature sensor's job is to deliver a signal to the electronic fan relay based on the engine water temperature, allowing the electronic fan circuit to start working. The electronic fan has two speeds: low and high. The electric fan will whirl swiftly when the engine heats up (high-speed gear).
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