The test fails when the VREF voltage from the PCM drops to a voltage less than a minimum calibrated value. The comprehensive component monitor (CCM) monitors the FRP sensor to the powertrain control module (PCM) for VREF voltage. P0190 - Fuel Rail Pressure (FRP) Sensor Circuit Malfunction
The PCM - engine computer uses the fuel rail pressure sensor input to send commands to the FPDM. PWM is employed in a wide variety of applications, ranging from measurement and communications to power control and conversion. Pulsewidthmodulation (PWM) is a powerful technique for controlling analog circuits with a processor's digital outputs. The fuel pump driver module controls the fuel by pulse width modulation Does the Vehicle start an run ? What engine does it have ? 4.0 or 4.6 L You vehicle has electronic returnless fuel system, Fuel rail pressure sensor, FPDM - fuel pump driver module.
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