How does EcU know about throttle pollution?

When the engine is empty, loosen the throttle behind the fuel filler door to see if the pointer drops to the minimum idle speed and remains stable, and judge accordingly.

Throttle is the throat of automobile engine. According to the engine load, the air intake is controlled, and the fuel injection is indirectly controlled.

After long-term use, there will be carbon deposit and oil dirt blockage, which will lead to inaccurate air intake control and seriously affect idle speed stability and idle speed jitter.