General Information

Engine Control
P0089 Fuel Pressure Regulator 1 Performance - General Information

Component Location





General Description

GDI ECM operates fuel pressure control valve with the signal from fuel rail pressure sensor to control optimized RPM and rail pressure.
High pressure pump adds high pressure to low pressure fuel from low pressure pump. Controling fuel pressure is done by fuel pressure regulator from 40 to 150 bar. Under the abnormal condition of high pressure fuel system, ECM contols fuel system as low pressure.

DTC Description

P0089 is set when a fuel pressure is too low or high compared with a set point.

DTC Detecting Condition





Diagnostic Circuit Diagram





Signal Waveform & Data




Fig.1) Normal waveform of FPR at idle.