FUEL INJECTION SYSTEM – BOSCH AFC - CelicaTech

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during sudden acceleration/deceleration by signaling ECU of the required fuel enrichment. Fig. 3: Contact-Type Throttle Position Sensor (Typical) COOLANT TEMPERATURE SENSOR This sensor provides ECU with engine temperature information relating to warm-up enrichment operation. Some models use a dualsensor element which also signals the ignition computer (if equipped). During warm-up period after a cold engine start, additional fuel is required to maintain engine performance. As engine temperature increases, the ECU decreases fuel enrichment until engine reaches normal operating temperature. ELECTRICAL RELAYS The various relays used with the electronic controls of the <strong>AFC</strong> injection system control power to injectors, fuel pump, ECU, and cold start system. The electrical relays may consist of one component for all relays or a combination of individual relays.
AUXILIARY AIR VALVE Most models with Bosch <strong>AFC</strong> fuel injection use an Auxiliary Air Valve (AAV) to shorten engine warm-up time. The AAV supplies additional air into the intake system which increases engine RPM during a cold start. The AAV consists of an electrically heated bi-metallic strip, movable disc, and air by-pass channel. The heater coil on the bimetallic strip is energized by the fuel pump relay. Control of the valve is based upon engine temperature; the air by-pass channel is open when engine is cold and gradually closes as temperature rises. At predetermined temperatures, air by-pass channel is blocked and additional airflow stops. See Fig. 4. Fig. 4: Auxiliary Air Valve (Typical) COLD START INJECTOR Most models use a cold start injector which delivers
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FUEL INJECTION SYSTEM – BOSCH AFC - CelicaTech

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