This causes the signal voltage to increase. As the coolant temperature decreases, the resistance of the thermistor increases. The ECT sensor changes resistance when exposed to different temperatures. The ECM supplies a 5 V reference signal which the ECT sensor uses to produce an analog voltage that indicates temperature. The ECT sensor is a thermistor sensor installed in the water supply housing (Freon® compressor bracket), Make sure charged fire extinguishers are in the work area.The function diagram for the ECT sensor includes the following: Make sure the vehicle is in neutral, the parking brake is set, and the wheels are blocked before doing any work or diagnostic procedures on the engine or vehicle.
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