Technical Description: Injectors: Notes
The injectors are of solenoid type with needle and seat. They open when a current flows through the coil and are closed by a powerful spring when the current is cut.
To achieve optimum combustion and thereby cleaner exhaust gases, the injectors have air-flushed jets to give a good distribution of the fuel.
Air is fed to the injectors from a passage in the intake manifold. Air from in front of the throttle is led to the passage via a bypass in the throttle body.
The injectors must not be rotated; the connectors must point straight up. Otherwise, the fuel will hit the walls of the intake passages and affect emissions and driveability.
The injectors are identical on all 4-cyl engines.
The injectors are supplied with current from the main relay, while the control module grounds them as follows:
- Injector 1 is controlled from pin 45.
- Injector 2 is controlled from pin 44.
- Injector 3 is controlled from pin 67.
- Injector 4 is controlled from pin 68.
The microprocessor controls the transistor in the firing order so that injection is completed just as the inlet valve in the cylinder in question opens.