2016 – MX-5 – Engine

HIGH PRESSURE FUEL PUMP [SKYACTIV-G 2.0]

Purpose, Function

• The high pressure fuel pump is used for the direct fuel injection system. Fuel, with a pressure of 450 kPa {4.59 kgf/cm², 65.3 psi}, from the fuel pump built into the fuel tank is boosted up to 20 MPa {204 kgf/cm², 2901 psi}, and it is pumped to the fuel distributor in an easily atomizable state.

Construction

• The high pressure fuel pump is located on the exhaust camshaft at the rear of the engine.

  

• The high pressure fuel pump consists of a spill valve control solenoid valve, spill valve, piston, and discharge valve.

  

Operation

• Fuel is suctioned and pumped by the up and down movement of the piston caused by the rotation of the cam installed to the rear end of the exhaust camshaft.

• Based on the control signal from the PCM, the spill valve control solenoid valve opens and closes in the high pressure fuel pump.

• If the spill valve control solenoid valve malfunctions and the fuel pressure exceeds the specified value, the relief valve opens to assure safety.

  

• For the high pressure fuel pump control details, refer to the [CONTROL SYSTEM]. (See HIGH PRESSURE FUEL PUMP CONTROL [SKYACTIV-G 2.0].)

Fail-safe

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