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.
In order to achieve optimum combustion and thereby cleaner exhaust gases, the injectors are fitted with air-flushed jets, which give a good distribution of the fuel.
The air is supplied to the injectors from passages in the intake manifold. Air before the throttle is led to the passage via a bypass in the throttle body.
The injectors must not be rotated. The connectors must be pointing up. Otherwise, the fuel jets will hit the walls of the intake passages, which affects emissions and driveability.
The injectors are supplied with current from the main relay and are grounded by the control module as follows:
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Injector 1 is controlled from pin 45.
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Injector 2 is controlled from pin 44.
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Injector 3 is controlled from pin 67.
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Injector 4 is controlled from pin 68.
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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 |
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If a break or short-circuit to ground or B+ occurs for any injector, diagnostic trouble code P1676 will be generated.
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System reaction to a fault
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Closed loop control system blocked.
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