You might be able to extract some useful information on what the 5.2.2 is actually monitoring and doing each cycle by reviewing this 5.2.1 diagnosis PDF. I found it interesting to be honest - about 1/2 way through the PDF.
https://www.nanocom-diagnostics.com/uploads/downloads/Bosch%20Motronic%20M5.2.1%20EMS%20ECU%20Guide.pdf