What are the symptoms of a faulty water temperature sensor?

1 Answers
LeKaylee
07/30/25 1:35am
The symptoms of a faulty water temperature sensor are: 1. The water temperature gauge needle may stop moving; 2. The water temperature gauge needle may directly point to the highest position; 3. It may also cause inaccurate water temperature detection. Most cars use water-cooled engines, which rely on the continuous circulation of coolant to remove excess heat. Water-cooled engines are equipped with water temperature sensors to monitor the coolant temperature. The function of the water temperature sensor is to convert the coolant temperature into an electrical signal, which is then input into the ECU. This has the following effects: 1. Adjusting the fuel injection quantity—increasing the fuel injection amount at low temperatures; 2. Adjusting the ignition timing—increasing the ignition advance angle at low temperatures and retarding it at high temperatures to prevent knocking; 3. Affecting the idle control valve—the ECU controls the idle control valve based on the water temperature sensor signal at low temperatures to increase the idle speed; 4. Affecting the EGR valve.
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