Fuel Charging and Controls

The fuel charging and control system consists of the:

• Electronic throttle body.
• Fuel injectors.
• Fuel charging wiring.
• Fuel injection supply manifold.
• Fuel rail pressure and temperature (FRPT) sensor.
• Fuel pump relay.
• Fuel pump driver module (FPDM).

The fuel injection supply manifold:

• Delivers fuel to the individual fuel injectors.
• Receives fuel from the fuel supply tube.

  The electronic throttle body:

  • Controls air supply to the upper intake manifold by electronically positioning the throttle plate.
  • Is not adjustable.
  • Cannot be cleaned.

  The fuel injectors:

  • Are electrically operated by the powertrain control module (PCM).
  • Atomize the fuel as the fuel is delivered.
  • Are deposit-resistant.
  • Each have an internal solenoid that opens a needle valve to inject fuel into the lower intake manifold.
• The fuel pump relay engages the fuel pump when energized by the PCM.
• The fuel rail pressure and temperature (FRPT) sensor:
  • Measures the fuel pressure and temperature and sends these signals to the PCM.
  • Uses intake manifold vacuum as a pressure reference.

  The fuel pump driver module:

  • Receives signals from the PCM.
  • Duty cycles the fuel pump.