Hi, I have figured out solution
I am sharing here for SDI users who may look for it.
After additional analysis of maps identified in ECU binary I have found map which drives EGR for SDI which do not have MAF as TDIs.
In this binary this is #75E82 which maps (IQ, RPM) to % EGR duty cycle (screenshot attached).
e.g. when cruising (IQ = 5 mg, RPM = 2000) value is 9500 which corresponds to 95% EGR valve open. When RPM increase above 3000 or engine load increase (IQ >= 21 mg) EGR valve is closed (value in map is 500 which corresponds to 5% EGR valve).
So I have changed all the values to 500 and achieved reported by VCDS EGR ON with 4.8% stable for all RPMs and IQs
In other binaries possibly you can find similar map couple maps after used by TDI (IQ, engine speed) -> expected MAF.
Enclosed you will updated flash, changes comparing to original binary:
For codeblock 2 (manual)
#75096 (IQ, engine speed) -> expected MAF = 850
#75E82 (IQ, engine speed) -> % of EGR = 500
For codeblock 8
#55096 (IQ, engine speed) -> expected MAF = 850
#55E82 (IQ, engine speed) -> % of EGR = 500
Possibly update in expected MAF maps is not used at all in SDI. I keep this consistent to configuration changes in % of EGR maps.
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