How to Determine if the Car Coolant Temperature Sensor is Faulty?

[LePatrick]

Methods to determine if the car coolant temperature sensor is faulty include: 1. The temperature gauge needle does not move and points to the highest position; 2. Difficulty starting the engine when cold, because the faulty temperature sensor still shows a hot engine temperature signal during cold starts, preventing the ECU from receiving the signal for a richer air-fuel mixture, thus only providing a leaner mixture; 3. Increased fuel consumption and unstable idle speed; 4. Difficulty accelerating, with the engine speed not increasing even when the throttle is fully pressed. The functions of the coolant temperature sensor are: 1. Converting the coolant temperature into an electrical signal and inputting it to the ECU; 2. Adjusting the fuel injection quantity, increasing it at low temperatures; 3. Correcting the ignition timing advance; 4. Increasing the ignition timing advance at low temperatures and delaying it at high temperatures to prevent knocking.