The Low Pressure Pump (LPP) supplies 65 psi(4.5 bar) of fuel pressure to the High Pressure Pump (HPP).
Using the internally located Fuel Pressure Regulator Valve (FPR), the HPP will boost the fuel pressure from 580 psi(40 bar) at idle to a maximum of 1958 psi(135 bar).
The Fuel Pressure Sensor (FPS) confirms the fuel pressure and returns the signal to the Powertrain Control Module (PCM).
Fuel pressure during limp-home mode is 65 psi(4.5 bar).
P0090 is set when the Fuel Pressure Regulator Valve (FPR) circuit opens.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Electrical Check | 1. Poor connection or broken wires 2. FPR(Fuel Pressure Regulator) |
Enable Conditions |
•
Battery Voltage: 10V~16V
•
Engine Speed: 0 | |
Threshold Value |
•
FPR Control: 2.2V-2.8V | |
Diagnostic Time |
•
0.8 Second | |
Mil On Condition |
•
2 Drive Cycles |
RPM | IDLE | 1,500 | 6,300 | Fault |
Fuel Pressure(psi) | 580 | 1305~1450 | 1958 | 65 |
Fuel pressure(bar) | 40 | 90~100 | 135 | 4.5 |
Fuel Pressure Regulator Valve (FPR) control value during increase and decrease of RPM.
Fuel Pressure Set Point and Fuel Pressure Values when the Circuit Opens
