![]() Since the CTS can go bad, you should be aware of the symptoms it gives off before it completely fails. At some point, your coolant temperature switch may need to be replaced by a professional mechanic. The coolant temperature switch can go bad over time, whether it is due to wear and tear, or an electrical issue. The PCM cycles this by using information from the coolant temperature sensor. The PCM cycles the cooling fan on and off to make sure the engine stays cool and to prevent it from overheating. Once the engine is warm, the PCM reduces the mixture to make it leaner. This prevents hesitation while the engine is warming up. If the PCM gets a cold reading from the CTS, the injector pulse width is increased to create a richer fuel mixture. Therefore, these functions are affected by the operating temperature of the engine. The message the sensor sends to the PCM affects the overall operation of the engine because much of the fuel, emissions, ignition, and drivetrain functions are handled by the PCM. The CTS detects these changes in temperatures and alerts the powertrain control module (PCM). ![]() It is also called the coolant temperature sensor, and it is an important part of keeping you safe and your vehicle running well.Ĭoolant from inside the cylinder heads and engine block absorbs heat from the cylinders while your vehicle is running. The coolant temperature switch (CTS) provides you with alerts when the engine temperature is rising or when it is overheating. ![]()
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