Rail pressure sensor, which is mounted on the fuel rail, measures fuel rail pressure.
GDI(Gasoline Direct Injection) ECM calculates controlled variable with the signal from fuel rail pressure sensor to control optimized RPM and rail pressure. ECM sends it to IDB(Injector Drive Box). IDB operates fuel pressure valve according to controlled variable from ECM.
If sensor signal input is higher than 4.85V during 0.5 sec, ECM sets DTC P0193.
Item
Detecting Condition
Possible cause
DTC Strategy
Signal check, high
Poor Connection
Open or short to power in signal circuit
Open in ground circuit
FPS
Enable Conditions
-
Threshold value
Sensor voltage > 4.85V
Diagnosis Time
0.5 sec.
MIL On Condition
2 Drive Cycles
Fig.1) Normal waveform of FPS at acceleration.