DTC P0087: Fuel Rail / System Pressure - Too Low [09/2014 - ]: Description
The high-pressure fuel system consists of the spill control valve, pump plunger, check valve, relief valve and fuel pressure sensor. The spill control valve opens and closes the low-pressure fuel line (from the fuel tank), the pump plunger (operated by the camshaft) pressurizes fuel, the check valve mechanically opens and closes the high pressure fuel line (to the fuel delivery pipe), the relief valve prevents fuel pressure from becoming extremely high, and the fuel pressure sensor located on the fuel delivery pipe monitors fuel pressure.
The fuel pump (for high pressure side) is installed to the cylinder head cover (bank 1 and bank 2) and is driven by the cam located at the rear end of the intake camshaft.
The plunger moves up and down by the camshaft rotations, and produces a vacuum to suck fuel and pressurizes the fuel. This fuel then pushes the check valve open and flows into the fuel delivery pipe. The ECM opens and closes the spill control valve to regulate the fuel pressure to the target fuel pressure of 2.5 to 18 MPa (25.5 to 183.5 kgf/cm2 , 363 to 2611 psi). In order to obtain and maintain the target pressure, the ECM monitors the fuel pressure using the fuel pressure sensor and performs the feedback control. If the internal fuel pressure of the fuel delivery pipe exceeds the standard pressure of 23.6 MPa (240.6 kgf/cm2 , 3423 psi), the fuel relief valve built into the fuel pump (for high pressure side) discharges the fuel pressure.
| *1 | No. 1 Injector Driver (EDU) | *2 | No. 2 Injector Driver (EDU) |
| *3 | ECM | *4 | Fuel Injector Assembly (for Direct Injection) |
| *5 | Fuel Pressure Sensor | *6 | Spill Control Valve |
| *7 | Pulsation Damper | *8 | Check Valve |
| *9 | Fuel Pump (for High Pressure Bank 1 Side) | *10 | Fuel Pump (for High Pressure Bank 2 Side) |
| *11 | Intake Camshaft (for Bank 1) | *12 | Intake Camshaft (for Bank 2) |
| *13 | Pressure Regulator | *14 | Fuel Filter |
| *15 | Fuel Pump (for Low Pressure Side) | *16 | Jet Pump |
| *17 | Fuel Tank | *18 | Fuel Relief Valve |
| *a | to Fuel Injector Assembly for Port Injection Line | *b | High Pressure Fuel Line |
| *c | Low Pressure Fuel Line | *d | Return Fuel Line |
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|---|---|---|---|---|
| P0087 | Fuel Rail / System Pressure - Too Low | Although the ECM is not requesting the fuel pump (for high pressure side) open the spill valve, fuel pressure decreases 5 MPa (51.0 kgf/cm2 , 725 psi) from target fuel pressure for about 10 seconds (1 trip detection logic). |
|
Comes on | DTC stored |