Yes! Now you have the picture. Every move you make with mechanical/hydraulic control is sensed and corrected for up to the extent of control.
Your car only has the fixed duty-cycle codes. If you are getting these duty-cycles you have no codes. To see a code, an example is 50% fixed. This is the code for O2 sensor. It appears untill the sensor is hot and generating its voltage signal.
There are codes in the archives. I don't have a list that can be attached.
Bosch Master, ASE Master, L1
33 years MB technician