The structure of the electric throttle can be roughly divided into the following parts: throttle valve, electromagnetic drive, potentiometer, controller (some are not directly connected by ecu), bypass valve. Its fault characteristics fall into two categories: hard faults and soft faults. A hard fault refers to mechanical damage, and a soft fault refers to dirt, misalignment, and the like.
The resistance part of the potentiometer is made by spraying a carbon film on the polyester substrate, which is actually a very low-level preparation process, and the wear resistance is not high. To put it bluntly, it is not as good as the potentiometer of our usual home appliances. The sliding contact consists of a row of anti-claws made of steel. Note that it is the anti-claw! This is simply worse! In addition, a little protective agent on the carbon film is not coated, and the dropped carbon powder causes poor contact, and the lighting is inevitable.
Everyone is often troubled by cleaning the throttle because the throttle opening is too low for most of the time. The air flows through the throttle gap at a very high speed (tens to hundreds of meters per second), and the accumulated dust has an influence on the air flow rate exceeding the throttle adjustment capability.