How often does Vitera's throttle valve have to be cleaned?

The following is about "How often does Vitera's throttle valve clean?" Related introduction:

The throttle in Vitera should be cleaned every 30,000-40,000 kilometers. Throttle is a controllable valve that controls air to enter the engine. Dirty throttle will lead to vehicle idling jitter, insufficient driving power, increased vehicle consumption, flameout and emission failure. Take Vitera 20 18 1.4T manual two-wheel drive Yao Xing Vitera as an example. It belongs to a small suv, and its body dimensions are: length 4 175mm, width 1775mm, height16mm, wheelbase 2500mm and fuel tank volume 47l. Vitera 20 18 1.4T manual two-wheel drive Yao Xing version has McPherson independent suspension at the front and trailing arm torsion beam independent suspension at the rear. It is equipped with 1.4l turbocharged engine, with maximum horsepower 140ps, maximum power 103kw and maximum torque of 220nm.