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Multiport Fuel Injection (MFI) System DESCRIPTION NCEC0014 Input/Output Signal Chart NCEC0014S01 Sensor Input Signal to ECM ECM func- tion Actuator Camshaft position sensor Engine speed and piston position Fuel injec- Injector Mass air flow sensor Amount of intake air Engine coolant temperature sensor Engine coolant temperature Heated oxygen sensor 1 (front) Density of oxygen in exhaust gas Throttle position sensor Throttle position PNP switch Gear position Vehicle speed sensor or ABS actuator and Vehicle speed Ignition switch Start signal Air conditioner switch Air conditioner operation Knock sensor Engine knocking condition Electrical load Electrical load signal Battery Battery voltage Power steering oil pressure switch Power steering operation Heated oxygen sensor 2 (rear)* Density of oxygen in exhaust gas * Under normal conditions, this sensor is not for engine control operation. Basic Multiport Fuel Injection System NCEC0014S02 The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of Various Fuel Injection Increase/Decrease Compensation NCEC0014S03 In addition, the amount of fuel injected is compensated to improve engine performance under various oper- I During warm-up I When starting the engine I During acceleration I Hot-engine operation I When selector lever is changed from “N” to “D” (CVT models only) I High-load, high-speed operation <Fuel decrease> I During deceleration I During high engine speed operation I During high vehicle speed operation (M/T models) I Extremely high engine coolant temperature ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION SR20DE Multiport Fuel Injection (MFI) System EC-23 |