Sequential Multi-Port Fuel Injection (SFI)

The fuel charging and controls system consists of the:

• electronic Throttle Body (TB).
• fuel injectors.
• fuel rail.
• fuel rail pressure and temperature sensor.
• Fuel Pump Driver Module (FPDM).

The fuel charging and controls system is:

• a Sequential Multi-Port Fuel Injection (SFI) system.
• Pulse Width Modulated (PWM).
• Mass Air Flow (MAF)-controlled.

Fuel is metered into each intake port in a sequential firing order. Fuel injectors pulse to follow engine firing order, in accordance with engine demand on a tuned intake manifold.

The PCM controls the fuel injection system. Injector pulse width is varied to control the amount of fuel flow. Varying Fuel Pump (FP) output controls fuel pressure. The PCM commands the FPDM  , which directly controls the FP  . The TB  is electronically controlled by the engine management system. Throttle plate angle is changed electronically in response to throttle pedal movements initiated by the driver.