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).
P0089 is set when a fuel pressure is too low or high compared with a set point.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Plausibility Check | 1. FPR(Fuel Pressure Regulator) 2. Low power supply to Fuel Pressure Sensor |
Enable Conditions |
•
Engine Speed: 512-4000 RPM | |
Threshold Value |
•
Fuel Presure: Too high or low | |
Diagnostic Time |
•
6.5 Seconds | |
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, Fuel pressure set point, FPR angle to open/close values at Idle state.
Fuel Pressure Regulator Valve (FPR) control value during increase and decrease of RPM.
