DTC P0191: Fuel Rail Pressure (FRP) Sensor Circuit Performance
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
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: |
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| 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. | ||