SOURCE: fuel rail pressure sensor chkt high input p0193
how to repair a Ford Freestar fuel rail pressure sensor
SOURCE: Fuel rail pressure sensor chkt high input p0193
Mine is on too (MIL, with p0193), 2005 freestar. My dealer can't figure it out for some reason? So I went out and bought a code reader, will fix it myself!
Anyways it can be the fuel pressure sensor (approx $100 for part), the fuel pump, or regulator on the fuel line, not too sure what they are worth, and time for labour? I am currently looking for a test gauge to check the pressure in the fuel line to see if it is pump or regulator or sensor. Hopefully your service guys can run a few similar tests and determine what needs to go.
SOURCE: Fuel rail system pressure too
What is too high? The specification for that vehicle is 35-70 Psi (2.4-4.8 kg/cm2)
What is the data reading on the Fuel Rail Pressure Transducer sensor?
What, exactly, are you trying to fix? Do you have rich oxygen sensor codes?
SOURCE: I'm working on a 2006 E350 with a 5.4L. Lacking
sounds like it could be a cpule things, i would start with replaceing the fuel filter and re-testing if that yeilds no change unplug the fuel presure regulator or if posible temp clap off the return line and check presure again, if it comes up to where it needs to be then replace the regulator. finnaly if none of those things solve it i would be very suspect of your fuel pump modual. good luck! let me know if i can be of further help, please rate my answer take care
SOURCE: how to fix codes p0190 & p0193 fuel rail pressure sensor codes
The two codes are both about the fuel rail pressure sensor. I would check fuel pressure with a gauge first.
If pressure is low try the fuel filter before anything else.
P0193 FORD Description
The Fuel Rail Pressure (FRP) sensor is a diaphragm strain gauge
device in which resistance changes with pressure. The electrical
resistance of a strain gauge increases as pressure increases, and the
resistance decreases as the pressure decreases. The varying resistance
affects the voltage drop across the sensor terminals and provides
electrical signal to the Powertrain Control Module (PCM) corresponding to pressure.
Strain
gauge type sensors are consider passive sensors. A passive sensor is
connected to a voltage divider network so that varying the resistance of
the passive sensor causes a variation in total current flow.
Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The FRP sensor measures the pressure of the fuel near the fuel injectors. This signal is used by the PCM to adjust the fuel injector pulse width and meter fuel to each combustion cylinder.
Read more: http://engine-codes.com/p0193_ford.html#ixzz21vmKrzhU
Testimonial: "I've changed the fuel filter, air filter, oil/oil filter, perfored a radiator flush, and the battery and starter tested good."
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