bourgeois1269

Does anyone know how long one can drive with a bad fuel rail pressure sensor. I have one on the way just have to dive to work.

BCURRY06F150

Can I ask you why you think it is bad?

bourgeois1269

Sure. My truck bogged down on me Saturday night and it felt fuel related so I went and got it scanned by auto zone amd advance and 3 codes popped up. P0174 twice but seperate and p0193. Well today I went to auto zone and swapped out my alternator because it's only a year new but while changing them I disconnected the ground. When I brought the old one back I got them to scan it again and this time only p0193 showed so 3 vs 1 now and I is idling and running different. After I left I went to my mechanic so he could check the fuel pressure and he and his partner narrowed it down and it makes sense that it's the FRPS. I have new filter, FPDM so we ruled them out after the pressure test the fuel pump was obviously working because it sent fuel back to the rail.

GATORB8

There is a pinpoint circuit test for p0193. Here's the summary in order of checks in case you need to keep going:

This pinpoint test is intended to diagnose the following:

fuel rail pressure ( FRP) sensor (6B288)
fuel rail temperature ( FRT) sensor (4702)
fuel rail pressure temperature ( FRPT) sensor (9G756)
harness circuits: FRP FRT and FRPT
powertrain control module ( PCM) (12A650)

bourgeois1269

I'm mechanically inclined to an extent but don't understand that but maybe my mechanic will tomorrow unless you can give me a shortcut to what that means.

GATORB8

I've got a subscription to alldata, which basically gives me access to the Ford Service Manual to our trucks. Using that, I have access to the Ford instructions for troubleshooting Diagnostic Trouble Codes.

Because P0193 is an electrical based issue, they have an electrical troubleshooting test called a "Pinpoint Test" so that the techs can use a process of elimination to figure out which part/sensor is failing without throwing parts at a problem. The list of parts I posted is the sequence of the sensor tests that can be done with a scan tool and/or multimeter to figure out which part is actually failing.

bourgeois1269

Well I do have a multimeter but I'm still not following the (sample)

GATORB8

PM'd