Symptoms of coolant temperature switch (temperature sensor) failure or failure

　　The coolant temperature sensor, also known as the coolant temperature switch, is an engine management system sensor that monitors the temperature of the engine coolant. Most coolant temperature sensors use resistance to measure the temperature of the coolant. This signal is then sent to the computer so that the timing and fuel calculations of the engine can be changed to achieve optimum performance because the engine requires more fuel when it is cooled and less fuel when it is fully warmed up. If the engine temperature is found to be too high, the computer will also reduce the engine performance settings to protect the engine from possible damage caused by overheating.

　　As temperature plays a crucial role in engine performance calculation, any problem with the coolant temperature sensor may quickly turn into an engine performance problem. Usually, the problem of the coolant temperature sensor will cause some symptoms, reminding the driver to thoroughly check the potential problems.

　　1. Poor fuel economy

　　One of the initial symptoms associated with coolant temperature sensor problems is poor fuel economy. If the coolant temperature sensor goes bad, it may send an incorrect signal to the computer and throw off the fuel and time calculations. It is not uncommon for the coolant temperature sensor to fail and send a permanent cold signal to the computer. This will cause the computer to think that the engine is cold, even if it is not, and therefore will use more fuel than necessary. This will reduce fuel economy and may hinder engine performance.

　　Black smoke from engine

　　Another symptom of a possible problem with the coolant temperature sensor is black smoke from the vehicle exhaust. If the coolant temperature sensor fails and sends a cold signal to the computer, it may confuse the computer and cause it to unnecessarily enrich the fuel mixture. If the fuel mixture becomes too rich and the fuel cannot be fully burned in the combustion chamber, it will burn in the exhaust pipe and cause black smoke. In severe cases, black smoke may be sufficient to ensure that the vehicle is not driven.

　　3. Engine overheating

　　Another symptom of a coolant temperature sensor problem is an overheated engine. The coolant temperature sensor may also fail in a way that causes it to send a permanent thermal signal. This may cause the computer to incorrectly compensate for the tilt signal, which may lead to overheating, or even a fire or engine ping.

　　4. Check whether the engine light is on

　　An illuminated check engine lamp is another symptom of a potential problem with the coolant temperature sensor. For some vehicles, if a problem is detected in the sensor signal or circuit, the computer will start the check engine indicator. The check engine indicator will remain on until the problem is resolved.

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