Ford
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    Fuel Rail Pressure Sensor Circuit Fault Conditions
Cause:
    Engine running, then the PCM detected that the FRP sensor VREF was less than its acceptable range (4v to 6v) during the self-test

Generic
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    Fuel Rail Pressure Sensor "A" Circuit