Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Hi all, I'm having trouble with fuel pressure diesel 4d20 fuel pressure sensor disconnected and all three pins are showing 5volts, can any one advise me? Why? 8
A short to reference voltage and an open at the same time further down the line on the low reference wire to the control unit would cause this. Did yo check continuity from sensor to edu? Do you know the circuit design?
An expert is someone who knows each time more on each time less, until he finally knows absolutely everything about absolutely nothing.
Would an open sensor ground give a 5 volts reading with the sensor disconnected??
If the sensor ground is shared with other sensors ahead of the break then yes. Would help if we knew whether the test was plugged in or disconnected. Then test the other way if you're uncomfortable with shorting 5V circuits with a test light
Thanks for advise, I cannot for the life of me get a wiring diagram for great wall haval5, not even from the dealer!n they change color of wires at the fuse box! I am sorry I even sighted this vehicle! spent untold hours on it! thanks again.
Thanks, the only code i am getting is PO255, I expected to get alot of codes! PO255 is fuel Fuel regulator valve/ cam/rotor, checked cam sensor OK, changed injectors which were bad! replaced fuel reg! so now I am tracing this short! v all 3 wires plug disconnected.
Hi Guys found problem! removed seat found ECU, traced wiring! no diagram! and found a mouse nest!! and guess what? YES! a bloody mouse had got hungry!! mouse house has gone and fumigated and all is well!! thank-you people soooo much for your advise! it was starting to do my head in kind regards Marcus.
