System Operation

Air is drawn through the air cleaner and air flow sensor, then into the engine. The air flow sensor measures the amount of air entering the engine and sends a voltage signal to the ECU. The ECU triggers the injectors to open, based on engine speed and the voltage signal from the air flow sensor. Injector opening duration is adjusted by the ECU based on inputs from various other sensors, sunch as engine and intake air temperature. Cold start enrichment is provided by a cold start valve (5th injector), which is controlled by the thermo time switch. Cold start and warm-up enrichment are also affected by the cylinder head and air intake temperature sensors. The auxillary air regulator supplies additional air to regulate idle speed during warm-up.