Describe the rationality diagnosis of emergency Wuling macro idle speed control valve (stepping motor). The engine speed is higher than expected, and the engine speed of short-circuit power supply is

Describe the rationality diagnosis of emergency Wuling macro idle speed control valve (stepping motor). The engine speed is higher than expected, and the engine speed of short-circuit power supply is higher. Brother, can you describe the cause and effect? Where is this written? . .

Let's just say that you made a mistake in the diagnostic instrument.

This error literally means that there is something wrong with the throttle control motor, wiring or the motor itself. You mean you shorted the power directly, right? That is to say, the wiring problem can be ruled out, and it is considered that the motor is abnormal, which leads to the inconsistency between the actual throttle opening and the system idle speed set throttle opening or the expected throttle opening.

Suppose your engine is equipped with an air mass flowmeter, then the throttle opening is calculated according to the air mass flowmeter. However, due to the problems of the actual actuator, if the opening is too large or too small, then the actual intake air volume will be larger or smaller than the calculated intake air volume, resulting in the increase or decrease of the speed. When the system calculates, it is found that it does not conform to the initial recent model, and an error will be reported.

It is better to record the values of air flow meter (or pressure sensor), engine speed and throttle opening at this time, find someone who is very familiar with this engine, or compare it with other people's data flow, and you can find the deviation.

The above is purely a guess after making a bunch of assumptions. For reference.