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I would think if you are getting an error it is probably a cable connection or winding in the stepper fault, because the ecu cannot know if the stepper is actually working, but could sense if there is no current feeding it (unless it looks at lambda readings to see if it changes with the stepper action) But I am only familiar with the Walbro ecu. A stuck open stepper could cause too much air to enter the engine and give a weaker mixture above idle.
 
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