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).
P0088 is set when the fuel pressure exceeds 3176 psi (219 bar).
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Plausibility Check | 1. Poor fuel return 2. Circuit short to Power |
Enable Conditions |
•
Engine Speed: 512-7008 RPM | |
Threshold Value |
•
Fuel Pressure: Greater than 3176 psi(219 bar) | |
Diagnostic Time |
•
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 |
When a driver accelerates rapidly, the fuel pressure signal is also upturned.
