Upon heating the water in the container, the sensor will demonstrate a particular resistance to a temperature change. The sensor can also be completely removed from the engine and submerged along with a thermometer into a water-filled container. Electric Vehicle Sensors for Leak Detection.Chemotherapy Patients Benefit from Optimum Coolant Flow During Treatment.Security Innovation Becomes an Active Member of CAR 2 CAR Communication Consortium.An ohmmeter (electrical instrument to measure electrical resistance) is attached to the sensor terminal. In order for a diagnosis, the ignition is switched off and the coolant temperature sensor connector is disconnected. Testing a Coolant Temperature Sensor – DiagnosisĪ standard test is performed in order to test whether the coolant temperature is working accurately. As soon as the driver puts their foot down on the accelerator, the engine will begin to warm up and the resistance of the sensor will drop. in the event of light or no acceleration to the vehicle’s engine), the resistance of this sensor will be high. Let’s imagine the coolant temperature sensor to be cold (i.e. The engine control and monitoring unit assists in controlling the temperature of the engine by supplying 5 volts to the circuitry connected to the coolant temperature sensor, which allows for a measurement of change in the voltage drop between the resistor and the coolant temperature sensor. It is important to monitor engine temperature as this will determine exactly how much fuel is to be injected into the engine. To control and maintain a balance in the engine temperature, the coolant sensor detects the drop in electrical resistance and emits a voltage to the resistor, a process that is completed in the space of a millisecond. In the event of air traveling through a vehicle engine, which can come as a result of heavy acceleration, the resistor to the sensor starts to cool down and drops its resistance charge. The resistor is connected to an electrical grid that behaves like a data logger measuring the temperature difference of the resistor. When the ignition switch is ‘on’, a voltage passes through the resistor and heats it up. when the engine coolant temperature increases, the electrical resistance decreases and this also causes a voltage drop in the sensor).Ī basic functional principle to a coolant temperature sensor begins with the ignition switch. There is an inverse relationship between the electrical resistance and the engine coolant (i.e. In terms of resistance capacity, this coolant sensor has 20,000 ohms at 248 degrees Fahrenheit. The coolant temperature sensor is fastened to the intake manifold of an engine coolant and is often referred to as a negative temperature coefficient type of sensor. Structural features to the temperature coolant sensor.
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