DTC P0087 Fuel Rail / System Pressure - Too Low: Description
The cylinder fuel injection method high-pressure fuel system consists of the spill control valve, pump plunger and check valve. The spill control valve adjusts the discharge amount of the high-pressure fuel, the pump plunger operated by the camshaft pressurizes fuel, the check valve mechanically opens and closes the line to the fuel delivery pipe. The fuel pump for high pressure 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. When the plunger moves up and down by the camshaft rotations, it pressurizes the fuel. The pressurized fuel then pushes open the check valve, and the fuel flows to the fuel delivery pipe. The ECM controls the spill control valve to adjust the fuel pressure to 4 to 13 MPa (41 to 133 kgf/cm2 ). The ECM receives signals from the fuel pressure sensor, monitors the fuel pressure, and maintains the target fuel pressure. If the fuel pressure of the fuel delivery pipe exceeds 15.3 MPa (156 kgf/cm2 ), the fuel relief valve opens and returns the fuel to the fuel tank.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0087 | Even though ECM commands fuel pump for high pressure to open spill control valve, fuel pressure decreases 5 MPa (51.0 kgf/cm2 , 725 psi) from target pressure for more than 10 seconds (1 trip detection logic) |
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