I'm trying to understand wgdc. As I understand it, wgdc is the percentage of air that is bled away from the wastegate actuator in order to make a target level of boost. Does wastegate duty cycle in logs tell how much air is actually being bled away, or does it tell us how much air the ecu is trying to bleed away in that situation? What I mean is say the solenoid is failing, will you be able to tell by the wgdc, or does the ecu think that it is still bleeding away the correct amount? How is it monitored?

Another question. Boost error/wgdc error (forget what its called) is the amount of correction that the computer makes if the boost level is not on target if I understand it correctly. So, basically if this is positive, it tells us there is something wrong with the car to not make enough boost. This is not something that is based on the wastegate and wg solenoid, but rather the car could be under/over boosting from anything - blown turbo, bad engine etc.? Or is that not the case?