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HelpForCars.net- All Aobut Automotive Repairs

P0193 FORD

P0193 FORD - Fuel Rail Pressure Sensor Circuit High Input

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Possible causes
- Low or no fuel
- Faulty Rail Pressure (FRP) Sensor
- FRP harness is open or shorted
- FRP circuit poor electrical connection
- Faulty Fuel Pump
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Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine will not start
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.
FORD Technical Service Bulletins for P0193 code
2008 FORD F-250 SD ELECTRICAL SYSTEM:FUSES AND CIRCUIT BREAKERS Details
2008 FORD F-350 SD ELECTRICAL SYSTEM:FUSES AND CIRCUIT BREAKERS Details
2008 FORD F-450 SD ELECTRICAL SYSTEM:FUSES AND CIRCUIT BREAKERS Details
2008 FORD F-550 SD ELECTRICAL SYSTEM:FUSES AND CIRCUIT BREAKERS Details
2008 FORD F-650 SD ELECTRICAL SYSTEM:FUSES AND CIRCUIT BREAKERS Details
2008 FORD F-750 SD ELECTRICAL SYSTEM:FUSES AND CIRCUIT BREAKERS Details
2008 FORD F-250 SD 115000 ELECTRICAL SYSTEM:FUSES AND CIRCUIT BREAKERS Details
2008 FORD F-350 SD 115000 ELECTRICAL SYSTEM:FUSES AND CIRCUIT BREAKERS Details
2008 FORD F-550 SD 115000 ELECTRICAL SYSTEM:FUSES AND CIRCUIT BREAKERS Details
2008 FORD F-650 SD 115000 ELECTRICAL SYSTEM:FUSES AND CIRCUIT BREAKERS Details
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