Sensor with negative temperature coefficient. Procedure for verification the functionality of the ECT sensor Here the voltage and the resistance are increasing with the raise of the temperature. Used in some older systems, such as Renix. With positive temperature coefficient.Their resistance decreases with the increase of the temperature. These are the most popular sensors used in cars. With negative temperature coefficient.Thereby, a coolant temperature dependent variable voltage signal is send to the onboard computer. At 90 ✬ its resistance is in the range of 200Ω to 300Ω. ECT gradually heats and its resistance reduces proportionately. After the engine start, coolant temperature begins to rise. In cold engine and an ambient temperature of 20 ✬ the sensor resistance is between 2000Ω and 3000Ω. In order to convert the ECT resistance variation to voltage variation, which is further processed by the ECU, the ECT sensor is connected in a circuit typically supplied with a reference voltage of +5V. The onboard computer uses the signal of ECT as the main correction factor when calculating the ignition advance and the injection duration. It is a two-wire thermistor immersed in coolant and measures its temperature. Hint – if you can’t find a temperature sensor in your car – this article should help.The engine coolant temperature sensor is temperature-variable resistor, which usually has a negative temperature coefficient. This aspect of preventative maintenance can certainly save you some headaches and hassle in the long run. You can always have your CTS replaced by an auto care professional. Even general wear and tear can cause the sensor to erode over time. If the engine sustains any kind of trauma or damage, sensor replacement is always recommended because you don’t want to risk running the vehicle with a faulty one. The sensor will eventually need to be replaced altogether after time. If you see the Check Engine sign light up, take your car in for professional servicing right away. Generally speaking, if your sensor is not working, it will send a signal to the computer and your Check Engine light will be illuminated. While this visual check can be helpful, it won’t help you diagnose every possible problem as some sensor malfunctions can present without visual evidence. If you know where the engine sensor is and what it looks like, you can conduct a visual inspection to see if it has developed any cracks or fissures. ![]() This can cause a range of problems, including overheating the engine. Additionally, it may signal the need for a richer fuel mixture or open the exhaust gas recirculation.Īs with any other component in your car, the sensor can go bad over time and fall into disrepair. From there, your vehicle’s computer will use this temperature information to either continue operating or adjust certain engine functions, always working to keep the engine temperature at an ideal level.Īs the control system receives the temperature from the CTS, it may trigger the cooling fan to either shut off or turn on. The temperature is then sent to the on-board control system. The sensor works by measuring the temperature that’s being given off by the thermostat and/or the coolant itself. ![]() The tip of the CTS is probably located right next to the engine coolant. On most vehicles, the coolant temperature sensor (CTS) can be found somewhere near the engine thermostat, which allows it to function optimally. ![]() But how does this car temperature sensor really work-and what’s its purpose? The sensor keeps tabs on the operating temperature and alerts the on-car computer when there’s a potential problem. You may not know-but hopefully, your vehicle coolant temperature sensor does. How hot does your vehicle’s engine get during an average drive?
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