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#3 wire coolant temperature sensor wiring diagram how to#
#3 wire coolant temperature sensor wiring diagram manual#

Compare the recorded readings of temperature and the respective resistance readings of the sensor from the service manual or from the internet for that particular model of sensor.

After another two minutes again take the values of this pair and note them.

Then after two more minutes again note the temperature of the surface of the engine and the resistance of the ECT sensor.

Note the values of the new resistance and temperature.

After two minutes note the temperature of the surface of the engine and the resistance of the ECT sensor’s resistance just like before.

Note the resistance of the ECT sensor along with the temperature and double-check the value of resistance from the service manual of the car.

Connect both wires to the connecting terminals of the ECT sensor and measure the resistance.

Set the Digital Multimeter to the resistance settings.

Note the temperature reading of the surface of the engine.

Measure the temperature of the surface of the engine using either a cooking thermometer or an infrared thermometer.Disconnecting the ECT sensor from the electrical connector.The testing steps of the ECT goes as follows: Once you’ve located the ECT sensor you are all set to test it. However, one of the most common locations of the ECT sensor is beside the thermostat housing. It can be on the cylinder head of the car or could be mounted on the radiator outlet pipe. When you open the hood of the car, you can find the ECT sensor in different locations depending on the make and model of your car.

#3 wire coolant temperature sensor wiring diagram how to#

How To Test Coolant Temperature Sensor Wiring With Multimeter Coolant Temperature Sensor Wiring Diagramįirst of all, you have to locate the engine coolant temperature sensor of the car. Related Post: Where Is The Engine Coolant Temperature (ECT) Sensor Located In this powerful article, you will learn how to test an engine coolant temperature sensor. The ECT sensor stops working due to many reasons and needs to test to verify the proper functioning of the sensor. This helps the ECU to determine the amount of fuel to be injected into the combustion chamber of the car to maintain the optimum temperature of the engine. The temperature of the engine is determined based on the change in temperature of the coolant as it has absorbed the heat from the engine. Upon the arrival of the signal back at the ECU’s end, it determines the coolant temperature by noticing the change in the signal. The sensor then sends the signal back to the ECU after processing it. The ECU of the car sends a signal to the ECT sensor the sensor senses the temperature of the coolant and processes the received signal at that particular temperature. A negative coefficient thermistor is one whose resistance falls with rising temperatures. Thermistors are resistors that change their resistance with the change in temperature. The engine coolant temperature sensor is a negative coefficient thermistor. Amplifier troubleshooting explained in detail