Injectors

Injectors

The injectors are of solenoid type with needle and seat. They open when current flows through the coil and a powerful spring closes them when the current is cut off.

To achieve optimal combustion and hence cleaner exhaust emissions, the injectors incorporate air-flushed spray nozzles which ensure good distribution of the fuel

Air is supplied to the injectors from a channel in the intake manifold. Air before the throttle is passed to the channel via a bypass in the throttle body. The injectors must not be turned; the connectors should point straight up. If they do not, the jets of fuel will strike the walls of the intake manifold, which will affect emissions and driveablity.

The injectors are supplied with current from the main relay and are grounded by the control module 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 concerned according to the firing order so that injection is finished roughly when the inlet valve opens for the cylinder concerned.

Diagnostics
- If a break or short-circuit to ground or B+ occurs for any injector, diagnostic trouble code P1676 will be generated.
- Closed loop control system blocked.