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Engine coolant temp sensor11/11/2023 ![]() In some cars, symptoms of this problem show up as erratic readings of the temperature gauge. ![]() This causes interruptions in the signal to the PCM and the PCM sets the fault. One of the common problems is when the sensor has poor connection inside or in the connector or in the wiring harness. If the signal from the sensor is missing, or it is outside of the expected range, the PCM turns on the Check Engine light and stores the related trouble code in its memory. Based on this signal, the PCM adjusts the engine performance and operates the electric radiator fans when the temperature reaches a pre-determined level. The PCM supplies a reference voltage (typically 5 Volt) and constantly monitors the ECT sensor signal. In some cases, this may help prevent overheating.Īn ECT sensor is connected to the main computer (powertrain control module or PCM). This allows the CHT sensor to measure the temperature of the engine correctly even with loss of coolant. The CHT sensor (see the photo) works the same way, but it measures the temperature of the cylinder head metal and is not immersed in coolant. Some cars use a cylinder head temperature or CHT sensor instead of, or in addition to the ECT sensor. Steps to diagnoseĮCT sensor is connected to the engine computer or PCMĪ second coolant temperature sensor could be installed in another part of the engine, or in the radiator. ![]() Signs of automatic transmission problems.How to check the engine when buying a used car.How to get the best deal on a used car?.Buying a Used Car: 10 Common Mistakes to Avoid.Hint – if you can’t find a temperature sensor in your car – this article should help. 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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