Here is not much information about the features of the logic of atmospheric motors with Med 9.1 ECU. For better understanding ECU logic for atmo VR6 engine with ECU 9.1 and without EGR, I traced logics and made pdf files with English parameter names:
From acceleration pedal to request charge:
https://drive.google.com/file/d/1ocpAElOcYyqo7ZSt7iB_C4nymQpNAqC5/view?usp=sharing
From request charge to throttle valve opening:
https://drive.google.com/file/d/1nI4XCaY8fBYU1vvoYkZ-2fNdSRuHwSdK/view?usp=sharing
From MAF to modelled air filling via throttle valve:
https://drive.google.com/file/d/11VyT0MlHLkbfGFQ4Z7WrVMHliTfgveMU/view?usp=sharing
From modelled air filling via throttle valve to predicted intake air charge:
https://drive.google.com/file/d/1PewQiaNFE9Pm-M4Iy14lwL7-A6icF88Q/view?usp=sharing
From predicted air charge to fuel injection time:
https://drive.google.com/file/d/1sJrPMRaLFtmzXwg4Ke561nNwJP8NQ1xo/view?usp=sharing
From engine rev to KFMIOP and maximum available indexed torque mimax_w:
https://drive.google.com/file/d/1GYleAEZd5y7sAytoVxBmb0ysDFHlstmS/view?usp=sharing
From lambda correction and request torque mrfa_w to LAMFA rk_w_KFMIRL_mibas_w:
https://drive.google.com/file/d/1A05SVrmh_pZST4feFHxRjIJx_pZp3Pbb/view?usp=sharing
From MAF to air charge via throttle valve:
https://drive.google.com/file/d/1WmNIysiTTuEDpYwJi10K86p0uzG6D2Pv/view?usp=sharing
It may be useful for someone.