05 gt p0191 error code

[Ponyryd]

-.34v at the feed wire to the pump? The car is running at this point? What are you using as ground?

[Monera3v]

ECU is seing -3v (PID saying -3v at the ACTUAL FUEL PUMP)

When unhook the plug it shows 12.2 with the keyon, and the sending unit wire see 11.32v

so ecu is not seeing proper voltage (only when the FRPS ) is plugged in it seems

[Ponyryd]

Right, so your numbers going to the ECM are false. This really, really sounds like corroded wiring, its really the only thing that will be fine for a while, then act up.

[ZR]

+1 on the above.
Did you recheck the harness you found full of water / some corrosion?

[Monera3v]

I'm trying to located where under the car the fuel pump wire runs 2! but car to low, and don't have no way of going under it!

[Monera3v]

Well I gave up the hunt for the electrical issue,but you guys were all right!

The wiring is shorting out! between the fuel rail pressure sensor , pump and ecu

that why when I would unplug the Fuel rail pressure sensor the voltage would should correctly! on sct data logger and back to the negatives when plugged in!!!

well redline is charging me 500, unfortunately it's my only car and needed this done. Due to time and not having any other way to get to work. I gave in and gave it to redline in scarborough

1 hour to find the issue
3 hours to replace the harness

[ZR]

Dirt cheap at that kinda $$.

[Ponyryd]

^I was gonna say the opposite, lol. We're under $100/hr here, they must be over by a bit. Regardless its good that its getting fixed.

[ZR]

I meant, they could have easily milked the figure it out hours, seems like an honest fix, don't hear of that so often these days.

[Ponyryd]

Ya, agreed, sounds about right time-wise.