I noticed that when reading MEMS 1.9 with my PScan unit there was a tuning option, that allowed you to adjust idle speed, fuel trim, ignition timing etc. But not for MEMS 3?
Also MEMS 3 I can use EOBD, ISO and BMW protocols to read the ECM but the BMW protocol doesn’t see to show any live data, just a ? for each value .
Any particular reason why this is so? Just curious !