Hi all. First post so here goes.
I have taken on a problem vehicle as is seem to be a real head scratcher. Peugeot boxer van 2.0hdi engine code RHV.
It has a p code P0191 fuel pressure inconsistent. I have checked the fuel pressure switch in the rail, I have 5v supply, ground and signal in the middle. I get 0.5v with ignition on and 1.25v on idle, this rises to 3v when revved. Not yet took a reading while driving under load. All readings have been taken from the ecu end of the wiring harness to check integrity of the wiring. According to my information this is all normal.
I have another machine reading fuel pressure while driving. Pressure on idle shows a min of 277bar, at around 3000rpm the van cuts out and flags up the code, fuel pressure at this point is 867bar. Vehicle will run in limp mode after this.
Any suggestions will be greatly received.