Fuel Injector: Description and Operation

PURPOSE
The six fuel injectors provide accurate control of the introduction of fuel into the intake system. The injector is an injection nozzle with a solenoid which injects fuel according to the injection signal coming from the engine control module.

OPERATION
The injector has a fixed nozzle opening area and the fuel pressure against manifold inside pressure is regulated to a fixed level. Therefore, the volume of fuel injected by the injector is determined by the time during which the needle valve is open, namely, by the time during which the solenoid coil is energized.

The battery positive voltage is applied through the MFI relay to this injector. When the engine control module turns on the power transistor in the unit, the solenoid coil is energized to open the injector valve, which then injects fuel.

CONSTRUCTION
The fuel injectors are of a Electromagnetic Activated Pintle Injector type.