Component Location
General Description

GDI ECM/PCM 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/PCM contols fuel system as low pressure.

DTC Description

When ECM/PCM detects open in the FPR control circuit, ECM/PCM sets DTC P0090.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

•

Signal check

1.

Poor connection

2.

Short to ground in control circuit

3.

FPR

Enable Conditions

•

-

Threshold Value

•

Open

Diagnostic Time

•

Continuous

MIL ON Condition

•

3 driving cycle

Diagnostic Circuit Diagram
Signal Waveform & Data

Fig 1) Normal waveform of FPR at idle.

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