Fuel Charging And Controls

Fuel Charging and Controls


3.7L


Sequential Multi-Port Fuel Injection (SFI)

The fuel charging and controls system consists of the:

- Throttle Body (TB).
- fuel injectors.
- fuel rail.
- Fuel Pump (FP) control module.

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 basic fuel requirement of the engine is determined from the data supplied to the PCM by the MAF sensor, which measures the amount of air being drawn into the engine.

The various sensors detect any changes in the operating conditions and send signals to the PCM. This permits the PCM to control the opening duration (pulse width) of the fuel injectors and maintain optimum exhaust emission control and engine performance for all operating conditions.


Throttle Body (TB)

The TB:

- controls air supply to the intake manifold by electronically positioning the throttle plate.
- is not adjustable.


Fuel Injectors

The fuel injectors:

- are electronically operated by the PCM.
- atomize the fuel as the fuel is delivered.
- each have an internal solenoid that opens a needle valve, which injects fuel into the intake port in the cylinder head.
- are deposit resistant.


Fuel Rail

The fuel rail:

- receives fuel from the fuel supply tube.
- delivers fuel to the fuel injectors.


Fuel Pump (FP) Control Module

The FP control module:

- is electronically operated by the PCM.
- controls voltage (10 or 12 volts) to the FP module depending on load.


3.5L Gasoline Turbocharged Direct Injection (GTDI)

The fuel charging and controls system consists of the:

- Throttle Body (TB).
- fuel injectors.
- fuel rails.
- fuel injection pump.
- FP control module.
- turbochargers.

The fuel charging and controls system is:

- a Gasoline Turbocharged Direct Injection (GTDI) system.
- Pulse Width Modulated (PWM).

Fuel is metered directly into the combustion chamber. Fuel injectors pulse to follow engine firing order, in accordance with engine demand.

The various sensors detect any changes in the operating conditions and send signals to the PCM. This permits the PCM to control the opening duration (pulse width) of the fuel injectors and maintain optimum exhaust emission control and engine performance for all operating conditions.


Throttle Body (TB)

The TB:

- controls air supply to the intake manifold by electronically positioning the throttle plate.
- is not adjustable.


Fuel Injectors

The fuel injectors:

- are electronically operated by the PCM.
- atomize the fuel as the fuel is delivered.
- each have an internal solenoid that opens a needle valve, which injects fuel directly into the cylinder head.
- are deposit resistant.


Fuel Rails

The fuel rails:

- receive fuel from the fuel injection pump.
- deliver fuel to the fuel injectors.


Fuel Injection Pump

The fuel injection pump is a single piston and a delivery-on-demand design. The pump is driven from an eccentric on the LH intake camshaft. It can raise fuel pressure from 448 kPa (65 psi) to anywhere between 1,516 and 14,823 kPa (220 and 2,150 psi). The fuel is then supplied to the fuel injectors for distribution into the cylinders.


Fuel Pump (FP) Control Module

The FP control module:

- is electronically operated by the PCM.
- controls voltage (10 or 12 volts) to the FP module depending on load.


Turbocharger

The turbocharger assembly consists of the:

- LH turbocharger.
- RH turbocharger.

Refer to Fuel Delivery and Air Induction.