hi,


if I read OBD using any universal software, it provides two values regarding EGR:
- Commanded EGR value (percentage 0-100)
- EGR ERROR (-100 to 100)
which is quite obvious what does they mean.

But when using MultiEcuScan it provides

- High pressure EGR valve opening %
- High pressure EGR actual position %
- High pressure EGR target position %

- Low pressure EGR valve opening %
- Low pressure EGR actual position mm

- Low pressure EGR target position mm

and couple more like control, learn etc.

My question is what is the difference between valve opening and actual position? As I assume "target" is what ECU wants it to be, "actual" is how really open it is, then what "valve opening" stands for?


Btw why Low values are in mm?

Welcome to the forum

You'd probably be better asking this question on the MultiECUScan forums to be honest.
http://forum.multiecuscan.net/

To be honest - I've tried two times ask there (other subjects) and get no response at all After asking questions on many different forums (fiat, alfa, tuning, mechanics, diy, local, Europe, USA etc., and even visiting 4 different garages, 2 tuning garages), I'm starting to believe that diesel engine (fiat's especially) runs on magic and nobody knows exactly how