How to measure Jetta's electronic throttle circuit?

The electrician will answer for you. It depends on whether you are a Jetta diesel car or a gasoline car. Diesel vehicles don't have too many requirements for throttle. On the contrary, it depends on how long you haven't cleaned the throttle. When I say cleaning, I don't want you to put a bottle of chemical cleaning agent on the accelerator, but to find a mechanic to remove the accelerator and clean it carefully. It is best to clean the speed regulating motor together by the way. And check the four wires on the air flow sensor for poor contact or oxidation. I want to test the throttle circuit. It seems that your car can't afford to refuel, so it's shaky. If there is, it is not necessarily the throttle, high-voltage bag, spark plug, high-voltage line. If it's not good, it will shake.