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-   -   05 gt p0191 error code (http://mustangforums.com/forum/2005-2014-mustangs/710256-05-gt-p0191-error-code.html)

monera05 05-24-2014 11:29 AM

05 gt p0191 error code
 
Hey guy's

Been posting on many forum in regards to my issue here
Before I take it into ford.
Issue is p0191, p1237 and the pump is constantly running with the key on (no engine start) but yes it turn off once key is off ,
as the chart below shows i'm seeing 75psi at the fuel rail, and pump is at 0.75 duty (150%?)

can anyone look at this data log and tell me if the pump seem to be bad , i see negative values at the pump, but the tables (pcm and fpdm) is giving positive voltage
Before i take it into ford just wanted some of y'all professional advise!

Thanks!

https://fbcdn-sphotos-c-a.akamaihd.n...39663634_o.jpg

moosestang 05-24-2014 11:57 AM

Does the car start? The pump runs and runs with the key on, engine off? It could be the fpdm or even the fuel pressure sensor

moosestang 05-24-2014 12:23 PM


this turned out to be a short to ground with the pump, but my money is on the fpdm.

monera05 05-25-2014 09:59 AM

fpdm and fps have been replaced
car runs perfectly fine

Simon1 05-26-2014 02:03 AM

Most of the twin pump set ups I've seen with issues usually come down to some type of wiring issue. Either bad ground or too small of wire. Just a guess.

moosestang 05-26-2014 05:17 PM

Quote:

Originally Posted by Simon1 (Post 8392116)
Most of the twin pump set ups I've seen with issues usually come down to some type of wiring issue. Either bad ground or too small of wire. Just a guess.

He doesn't have a twin pump. If the fpdm and fps have been replaced, then that only leaves a short in the pump or a short in the wiring.

drumhedd2005 10-16-2014 02:11 AM

Im having the opposite problem. I keep getting the same code on my 05' GT. The pump stays on for a second when i turn key on (normal) but it starts REALLY HARD. Other times it doesn't start hard. It idles perfectly normal with no backfiring or missing. I replaced the fuel pump in Sept 2012, fuel filter was replaced about 2000 miles ago, I cleaned the MAF sensor, replaced spark plugs, and also replaced the fuel rail sensor. The car hesitates sometimes when I press down on the gas (not jumping on it) which is triggering the code. Its almost as if something is causing the fuel pressure to "hiccup." Any ideas???????? :(


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