19 what's the matter with Teana's slow down after it started?

19 Teana can't reduce the speed of 1800 after starting, which may be due to the failure of throttle valve, idle speed control valve and water temperature sensor.

1, throttle failure. Throttle mainly controls the air intake of the engine. Throttle failure will lead to incorrect throttle opening and reduce the sensitivity of throttle. When idling, the throttle will not be closed properly, which will cause abnormal idling, so the throttle will be released, but the idling will not come down.

2. Idle speed control valve is faulty. The idle control valve is located above the throttle body. When the car is idling, the throttle will be completely closed. At this time, the idle speed is adjusted by controlling the amount of air bypassing the throttle body. If the idle valve fails, the idle speed will not be adjusted correctly, resulting in unstable idle speed and inability to reduce it.

3. The water temperature sensor is faulty. Water temperature sensing signal is an important signal for engine computer to determine idle speed. If the water temperature sensor fails, the signal of the water temperature sensor will be abnormal, which will make the idle speed control function of the engine computer abnormal. When the water temperature value obtained by the engine computer is lower than the actual value, the idle speed of the engine will be high, so it is impossible to reduce the idle speed of the car by loosening the throttle.