Sorry for the unclear defintion! What I wanted to express was the possibility, that the engine oil could be not the one which Ford claims to use with the powerstroke engines. I read that a wrong oil-type can lead to foaming in the high pressure system, which would explain to me the low oil pressure (ICP), but I do not think that the foaming condition will be present while cranking.I don't know what you mean by "non-Powerstroke" rated oil, but what I do know, is that using too thick of a viscosity of engine oil CAN actually slow down engine cranking RPM by as much as 30%.
We are now trying to get the correct/higher cranking rpms and then read the ICP values. We can also change the ICP sensor + connector as suggested, but as far as I understand the system, this cannot be the cause for the not starting condition, right?