How to Determine if the Sail Water Temperature Sensor is Faulty?

[LaCamila]

The simplest method is to use a multimeter for testing, then heat the water temperature sensor with a hair dryer. If the resistance value does not change, it indicates that the water temperature sensor is faulty. When the Sail's water temperature sensor fails, it can cause difficulties in starting the car, weak acceleration, water temperature gauge alarm, and other phenomena. A faulty water temperature sensor will affect the engine's power output. It is recommended to conduct timely repairs if the above symptoms occur. The function of the car's water temperature sensor is to convert the coolant temperature into an electrical signal, which is then output to the electronic control unit to adjust the fuel injection amount, modify the ignition timing, and influence the idle speed control valve, among others. When the engine coolant temperature is low, the water temperature sensor input to the ECU adjusts the air-fuel ratio to be richer, stabilizing engine operation. If the water temperature sensor fails to transmit the cold engine status information, the air-fuel ratio will become leaner, causing abnormal engine operation. Similarly, if the sensor transmits cold engine information after warm-up, the air-fuel ratio will become richer, also leading to abnormal engine operation. If the Sail's water temperature sensor is faulty, the following symptoms may occur: 1. The water temperature gauge needle does not move or points to the highest position. 2. Difficulty in cold starting because the faulty water 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 and only providing a leaner mixture to the engine. 3. Increased fuel consumption, unstable idle speed; difficulty in acceleration, with the engine speed not increasing even when the throttle is fully pressed.