Injectors
| Injectors |
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 supplied with current from the main relay, while the control module grounds them 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 in the firing order so that injection is completed just as the inlet valve in the cylinder in question opens.
| Diagnostics |
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If there is an open circuit or short circuit to ground or B+ on any of the injectors, diagnostic trouble code P1676 will be generated.
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System reaction to a fault
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Closed loop is blocked.
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