![]() The side effect of this reaction is that the fuel economy will drastically be cut. This in turn triggers the ECM to either add more fuel or reduce air mixture to create a “rich” situation, designed to cool the cylinders and reduce the potential of overheating. The engine is getting poor fuel economy: when the coolant temperature sensor is not functioning correctly, it tends to relay false information to the engine control module. Noted below are a few of the warning signs that will alert you that the coolant temperature sensor is damaged and needs to be replaced. Before you make the decision to replace the coolant temperature sensor, make sure diagnose some of the warning signs of a faulty coolant temperature sensor. Taking time to properly diagnose the precise cause of the overheating situation is very important to providing a solution and actually fixing what is broken. When a problem occurs with engine heating or overheating, it may be due to one or multiple broken parts. The coolant system on today's cars, trucks, and SUV's is comprised of multiple components that work together to keep your engine running well. Part 1 of 3: Diagnosing a problem with the coolant temperature sensor ![]() If you discover that the sensor is failing, you'll have to replace this device by following the step-by-step instructions noted below. When the signal is sent to the ECM, the computer adjusts the vehicles ignition timing, fuel flow, and other factors that trim or enhance performance based on the coolant temperature.ĭue to the fact that engine temperature plays a vital role in the overall performance of any vehicle, having a properly functioning coolant temperature sensor is essential. The coolant temperature sensor (switch) utilizes electrical resistance to measure the coolant's temperature. When the sensor is functioning properly, it will tell your on board computer if the temperature is too high, alerting the driver that a problem exists by illuminating a warning light on the dashboard. The coolant temperature sensor, also known as the coolant temperature switch, is the engine management system that monitors the temperature of the coolant and relays this information to the ECM. One of the most important systems to monitor is the cooling system, which includes the radiator, water pump, radiator fan, coolant lines, and overflow tank. When the system fails to gather this information it can lose its effectiveness at starting the engine.Today's engines monitor virtually every function to ensure your vehicle runs strongly and efficiently every day. The ECU needs to know the coolant temperature and the outside air temperatures in order to figure out the correct cold-start air/fuel combination. If you hit the gas pedal but struggle to get your car going, it could mean a problem with the coolant sensor. Note- If there is an excess of black smoke coming from the exhaust pipe, it is advised to contact a mechanic immediately. Inaccurate readings sent from the coolant temperature sensor can cause the fuel management system to mix fuel improperly. When the ratio of air-fuel is not in proportion, particularly if the mixture becomes too fuel-rich, It will get exceedingly difficult to process the fuel completely inside the combustion chamber, leading to the burning of the leftovers in exhaust pipes. If you notice black smoke coming out of the exhaust pipe it could be due to a miscalculation of the air-fuel mix in the engine. This is another clear-cut sign of a bad sensor. A faulty sensor can send a permanent cold signal to the engine by not pumping enough fuel when needed, while it can also feed a permanent heating signal by not turning the radiator fans when the temperature climbs. If the coolant temperature sensor is not able to detect hot and cold conditions, it can cause the engine to get overheated. If your car uses only one all-purpose temperature sensor that fails to produce an accurate reading of the engine’s temperature, a bad engine coolant temperature sensor might be the cause of the cooling fans not starting. While most cars have two separate sensors for the electric fans, dashboard, and engine management system, some vehicles only have one coolant temperature sensor to manage the cooling fans. Electrical Cooling Fans Not StartingĪnother suggestive sign of a broken coolant temperature is the cooling fans for the engine not coming on. ![]() This cycle will cause the engine to deliver poor fuel economy and more importantly, will lose its efficiency in the long run. ![]()
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