Fuel Control: Injectors

The injectors, located in intake manifold, point directly toward intake valve. All injectors are supplied with fuel from a common fuel manifold. The injection pulse is controlled electrically by a needle valve in lower section of injector. The needle valve is operated by an electric solenoid which is switched on and off by the ECU.

ECU controls timing and duration of injector operation based on input signals from Hall sensor, throttle sensor, temperature sensor and air mass meter. ECU uses pre-programmed values to calculate optimum injector duration.

Injectors open simultaneously once per engine revolution, except during cold starting. During cold starting, injectors are opened twice per engine revolution.