The Composition of the Coolant Temperature Sensor and the Connection with the ECU
Generally two wire of coolant temperature sensor is generally and connect the electronic control unit (ECU), using thermal sensitive to temperature changes with the special negative temperature coefficient of resistance, the water temperature at the lower temperature, the thermistor resistance becomes, the greater the electronic control unit is based on the signal, to increase fuel injection quantity.
Function: check the temperature of engine cooling fluid and input its temperature signal into ECU to provide accurate basis for revising fuel injection quantity and time.
The coolant temperature sensor is connected with the ECU.
When the coolant temperature is low, the resistance value of the thermistor will be increased and the signal score pressure is high. Conversely, the partial pressure of the signal is low.
When the partial pressure value of the signal is high, ECU can judge the temperature of the temperature cooling fluid is low, and the engine is in the condition of cold start or warm machine.
At this time, the fuel evaporation is poor, and ECU should make the mixture concentration higher to improve the engine cooling operation.
When the signal scoring pressure is low, the ECU can end the cold start or warm up process of the engine.
The ECU controls the mixture concentration according to other working conditions.
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