What are the symptoms of a faulty coolant temperature sensor in the Excelle?

[CaliFitz]

Here are the symptoms of a faulty coolant temperature sensor in the Excelle: 1. The temperature gauge needle does not move or points to the highest position. 2. Difficulty starting the engine when cold, because the faulty coolant temperature sensor still shows a hot engine temperature signal during cold starts, and the ECU cannot receive the signal for a richer air-fuel mixture, only providing the engine with a leaner mixture. 3. Increased fuel consumption, unstable idle; difficulty accelerating, even when the throttle is fully pressed, the engine speed does not increase. Below is additional information: 1. When the coolant temperature sensor fails, it often still displays the hot engine temperature signal during cold starts. The ECU does not receive the signal to provide a richer air-fuel mixture and can only supply the engine with a leaner mixture (the signal for a hot engine), making it difficult to start the engine when cold. 2. Most automotive coolant temperature sensors are made using NTC thermistors. The vehicle's computer receives the resistance value transmitted by the NTC. Therefore, whether the sensor 'fails' due to a short circuit or an open circuit, the vehicle's computer will receive either a resistance of 0 or an infinite resistance. In both cases, the vehicle's computer will determine that the temperature sensor has malfunctioned. The malfunction indicator light will stay on or be accompanied by an alarm sound, and the vehicle will forcibly reduce the intake air volume and fuel injection quantity, lowering the engine's operating speed to avoid unnecessary damage and wear caused by engine overheating.