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P0193 - Fuel Rail Pressure Sensor A Circuit High

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.
P0193 - FUEL RAIL PRESSURE SENSOR A CIRCUIT HIGH

Description:  The comprehensive component monitor (CCM) monitors the fuel rail pressure (FRP) sensor circuit to the powertrain control module (PCM) for high voltage. If voltage exceeds a calibrated limit for a calibrated amount of time during testing, the test fails.
Possible Causes: 
  • FRP signal shorted to VREF or VPWR
  • FRP circuit open
  • SIGRTN circuit open
  • VREF shorted to VPWR
  • Damaged FRP sensor
  • Damaged PCM
Diagnostic Aids:  An FRP PID value greater than 4.75 volts during key ON, engine OFF or key ON, engine running indicates a concern is present.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   refer to PINPOINT TEST DD .