DTC P0191: Fuel Rail Pressure Sensor A Circuit Range/Performance

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 difference between the fuel rail pressure requested by the PCM and the fuel rail pressure delivered exceeds 138 kPa (20 psi) for greater than 8 seconds.
Possible Causes: High fuel pressure Low fuel pressure Damaged FRP sensor Excessive resistance in the circuit Vacuum leaks Low or no fuel
Diagnostic Aids:
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to PINPOINT TEST DD .