Fuel Charging and Controls

The fuel charging and controls system consists of the:

• throttle body.
• fuel injector.
• fuel charging wiring.
• fuel injection supply manifold.
• fuel pressure and temperature sensor.
• fuel pump relay.
• fuel pump driver module.

The fuel charging and controls system is:

• a sequential multiport fuel injection (SFI) system.
• pulse-width modulated.
• mass air flow controlled.

The fuel injection supply manifold:

• delivers fuel to the individual fuel injectors.
• receives fuel from the fuel supply line.

The throttle body:

• controls air supply to the upper intake manifold by positioning the throttle plate.
• connects the accelerator cable and, if equipped, speed control actuator cable to the throttle plate.
• is not adjustable.
• cannot be cleaned.

The fuel injectors:

• are electrically operated by the powertrain control module (PCM).
• have an internal solenoid which opens a needle valve to inject fuel into the lower intake manifold.
• atomize the fuel as the fuel is delivered.
• are deposit-resistant.

The fuel pressure and temperature sensor:

• measures the pressure and temperature of the fuel in the fuel supply manifold 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.

The fuel pump relay engages the fuel pump when energized by the powertrain control module through the fuel pump driver module.