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P0190 - Fuel Rail Pressure Sensor A Circuit

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
P0190 - FUEL RAIL PRESSURE SENSOR A CIRCUIT

Description:  The comprehensive component monitor (CCM) monitors the fuel rail pressure (FRP) sensor to the powertrain control module (PCM) for VREF voltage. The test fails when the VREF voltage from the PCM drops to a voltage less than a minimum calibrated value.
Possible Causes: 
  • VREF open in harness
  • VREF open in sensor
  • VREF open in PCM
Diagnostic Aids:  Verify the VREF voltage is between 4 and 6 volts.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   - - refer to PINPOINT TEST DD .
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