i had on a 2000 V6150 ficht ram a very slight leak in the oil supply line between the tank and the pump. the EMM detected it throwing a no oil warning and throwing the engine in SLOW mode. that happened with such a slight leak that the actual oiling was not in danger. the EMM seems to be very sensitive in detecting faults in the oil circuit . i agree there will be no sensor when the actual injector quits or cloggs , but i guess the EMM will notice the pressurure change and take measures.
all in all the system seems to be very well designed and you can trust that in all practical cases of a hazardous malfunction in the oil supplly to the engine the EMM will notice it and give a warning as well push the engine in SLOW mode.
btw : a 200 V6 2001 ficht in good condition is a masterpiece of engiinering when you understand the engine !