Originally Posted by
IARLLC
There is only 1 connector on the oil pump and it goes through the front cover (passenger side of the ballancer) to a type of pressure control solenoid on the actual pump. Only 2 wires so it is all command, no sensor. Even if unplugging it did lower the pressure, in my mind, there is no chance that it could drop the oil pressure enough for a "low oil pressure" warning at idle. It must have just been a programmed reaction from the PCM when it loses contact with the solenoid to turn on the low oil pressure warning.
It would have been a good idea to scan oil pressure during the first start-up with it unplugged....but I was in the middle of 3 other jobs when he stopped by with the news that he now has the start-up rattle...and nobody on here mentioned the chance of this negative side-affect. It was stated that there were no codes and it helped the issue at least temporarily until the update can be done. I would have just plugged him into my IDS for an update but it sounds like we are supposed to hold off of that for now.
He'll be back by in a few days. I can unplug it again and scan the oil pressure next time. HPTuners does have a setting for oil pressure warning or something like that under General. I may dig into that next time if Ford still has not figured out what to do with this.