DTC P0090-00: Fuel Pressure Regulator 1 Control Circuit/Open: General Description
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GDI ECM operates fuel pressure control valve (FPCV) with the signal from rail pressure sensor (RPS) to control optimized RPM and rail pressure.
High pressure pump adds high pressure to low pressure fuel from low pressure pump. Controlling fuel pressure is done by fuel pressure control valve (FPCV) from 40 to 150 bar. Under the abnormal condition of high pressure fuel system, ECM controls fuel system as low pressure.