When the ignition is switched on, the ECU turns on the electric fuel pump, which creates fuel pressure in the distribution line. At the same time, the ECU processes the signal from the coolant temperature sensor to determine the duration of the injection pulses required to start. When the engine crankshaft begins to turn during start-up, the ECU generates an injector activation pulse, the duration of which depends on the temperature of the coolant.
When starting a cold engine the injection pulse increases, the injectors open for a longer period of time and inject more fuel (a more saturated working mixture is obtained).
When starting a warm engine The ECU, having received information about the temperature of the coolant, gives a command to close the installed idle stabilization valve, as a result, the duration of the injection pulse decreases, and the opening time of the injectors is reduced to the nominal value.
At idle information to the ECU comes from the throttle potentiometer located in the throttle body and the mass air flow sensor. By reducing the speed, the ignition timing changes and the duration of the injection pulse increases, as a result of which the amount of injected fuel increases.
During normal engine operation The position of the throttle valve and the amount of intake air passing through the mass air flow sensor determine the duration of the opening of the injectors and thus the operating mode of the engine.
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