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P0191 - Fuel Rail Pressure Sensor A Circuit Range/Performance

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P0191 - FUEL RAIL PRESSURE SENSOR A CIRCUIT RANGE/PERFORMANCE

Description:  The comprehensive component monitor (CCM) checks the fuel rail pressure (FRP) sensor for an acceptable fuel pressure. The test fails when the fuel pressure falls below or exceeds a minimum/maximum calibrated value for a calibrated period of time.
Possible Causes: 
  • High fuel pressure
  • Low fuel pressure
  • Damaged FRP sensor
  • Excessive resistance in the circuit
  • Vacuum leaks
  • Low or no fuel
Diagnostic Aids:  A FRP PID value during key ON, engine running of 138 kPa (20 psi) to 413 kPa (60 psi) is acceptable.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   refer to PINPOINT TEST DD .
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