P0190 – Fuel Rail Pressure Sensor A Circuit

P0190 – Fuel Rail Pressure Sensor A Circuit
Description:                 The comprehensive component monitor (CCM) monitors the fuel rail pressure (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:          VREF voltage should be between 4.0 and 6.0 volts.
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