SOURCE: code P0193
The pressure in your fuel injection system is too high. You might need a new fuel pump or fuel regulator. Disconect the fuel line and check the pressure with a gauge {should be about 14 psi}. If it is its the regulator, if not the pump.
SOURCE: p0193 fuel rail pressure circuit
P0193 - Fuel Rail Pressure Sensor Circuit High Input
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.
Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine will not start
Possible causes
- Excessive resistance in the circuit
- Low or no fuel
- Wiring harness connector of the fuel pressure sensor
- Fuel Rail Pressure Sensor
- Fuel Pump
Hope this helps (remember to rate this answer).
SOURCE: 2005 Ford explorer starts up
It's the fuel pump. Change it and the fuel filter. I doubt if any of the other items are faulty.
Have a good one!
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