Can you see this happen watching a guage ( CTS etc. ) in the duty cycle ? If so ,how
much % change would you see ?
Yes, the VGT% will change from 14%-85% and you will hear the truck exhaust go from a low rumble to at high rumble or whistle.
The PCM commands the variable geometry turbo actuator duty cycle from 15% to 85% in a step pattern to help the turbo vanes achieve full movement. Vane sweep occurs when the following conditions are present:
The vehicle is stopped.
The EGR is commanded off.
The engine speed is less than 1,160 RPM.
The engine oil temperature is greater than a calibrated value.
Vane sweep repeats approximately every hour if the previous conditions still exist. Vane sweep may occur during scan tool commanded test functions.
Here is a video with using AE.
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2004 F350 CC DRW King Ranch
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