P0190 - Fuel Rail Pressure Sensor Circuit Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?
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
  What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine will not start
P0190 Description

The FRP sensor is a diaphragm strain gauge device. The FRP sensor measures the pressure difference between the fuel rail and atmospheric pressure. The FRP sensor nominal output varies between 0.5 and 4.5 volts, with 0.5 volts corresponding to 0 MPa (0 psi) gauge and 4.5 volts corresponding to 26 MPa (3771 psi) gauge. The sensor can read vacuums and may lower the output voltage to slightly below 0.5 volts. This condition is normal and is usually the case after several hours of cold soak before the vehicle dome light is turned on. The FP module is energized at the same time the dome light is commanded on. A disabled or malfunctioning dome light does not affect the FP module control.

The FRP sensor is located on the fuel rail, and provides a feedback signal to indicate the fuel rail pressure to the Powertrain Control Module (PCM). The PCM uses the FRP signal to command the correct injector timing and pulse width for correct fuel delivery at all speed and load conditions. The FRP sensor, along with the fuel volume regulator (part of the fuel injection pump), form a closed loop fuel pressure control system. An electrically faulted FRP sensor results in the deactivation of the fuel injection pump. Fuel pressure to injectors is then provided only by the FP module. When the fuel injection pump is de-energized and the injectors are active, the fuel rail pressure is approximately 70 kPa (10 psi) lower than FP module pressure due to the pressure drop across the fuel injection pump. Thus, if the FP module pressure is 448 kPa (65 psi), then the fuel rail pressure would be approximately 379 kPa (55 psi) if the injectors are active.

P0190 Information for specific makes
P0190 FORD Fuel Rail Pressure Sensor Circuit Malfunction
P0190 LEXUS Fail Rail Pressure Sensor Circuit
P0190 LINCOLN Fuel Rail Pressure Sensor Circuit Malfunction
P0190 MAZDA Fuel Rail Pressure Sensor Circuit Malfunction
P0190 MERCEDES-BENZ Fuel Rail Pressure Sensor Circuit Malfunction
P0190 MERCURY Fuel Rail Pressure Sensor Circuit Malfunction
P0190 VOLKSWAGEN Fuel Rail Pressure Sensor Signal Circuit Fault
Related Information
Repair Importance Level: 3
1=Low 2=Medium 3=High  
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard  
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