DTC P0191: Fuel Rail Pressure (FRP) Sensor Circuit Performance

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P0191 - FUEL RAIL PRESSURE (FRP) SENSOR CIRCUIT PERFORMANCE

Description:	The comprehensive component monitor (CCM) checks the FRP for 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 (KOER) of 138 kPa (20 psi) to 413 kPa (60 psi) is acceptable.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
Fuel rail pressure temperature (FRPT) sensor	GO to DD: Fuel Rail Pressure (FRP), Fuel Rail Temperature (FRT) and Fuel Rail Pressure Temperature (FRPT) Sensors STEP DD34.
Fuel rail pressure (FRP) sensor only	GO to DD: Fuel Rail Pressure (FRP), Fuel Rail Temperature (FRT) and Fuel Rail Pressure Temperature (FRPT) Sensors STEP DD9.
Fuel rail pressure (FRP) and fuel rail temperature (FRT) sensors	GO to DD: Fuel Rail Pressure (FRP), Fuel Rail Temperature (FRT) and Fuel Rail Pressure Temperature (FRPT) Sensors STEP DD9.