DTC P0190: Fuel Rail Pressure (FRP) Sensor Circuit Malfunction

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.

P0190 - FUEL RAIL PRESSURE (FRP) SENSOR CIRCUIT MALFUNCTION

Description:	The comprehensive component monitor (CCM) monitors the FRP sensor to the powertrain control module (PCM) for VREF voltage. The test fails when the VREF voltage from the PCM drops to a voltage less than a minimum calibrated value.
Possible Causes:	VREF open in harness VREF open in sensor Vacuum leaks
Diagnostic Aids:	Verify a VREF voltage between 4 and 6 volts.
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 DD26.	GO to DD: Fuel Rail Pressure (FRP), Fuel Rail Temperature (FRT) and Fuel Rail Pressure Temperature (FRPT) Sensors STEP DD26.
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 DD1.
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 DD1.