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Normal control Input/output signal chart Sensor Input Signal to ECM ECM Function Actuator Crankshaft position sensor (TDC) Engine speed Fuel injection con- Electronic control fuel injec- Accelerator position sensor Accelerator position Vehicle speed sensor Vehicle speed The amount of fuel injected under normal driving conditions is Maximum amount control Input/output signal chart Sensor Input Signal to ECM ECM Function Actuator Mass air flow sensor Amount of intake air Fuel injection con- Electronic control fuel injec- Engine coolant temperature sensor Engine coolant temperature Crankshaft position sensor (TDC) Engine speed Accelerator position sensor Accelerator position The maximum injection amount is controlled to an optimum by the engine speed, intake air amount, engine Deceleration control Input/output signal chart Sensor Input Signal to ECM ECM Function Actuator Accelerator switch (F/C) Accelerator position Fuel injection con- Electronic control fuel injec- Crankshaft position sensor (TDC) Engine speed The ECM sends a fuel cut signal to the electronic control fuel injection pump during deceleration for better SEF649S ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION ZD30DDTi Fuel Injection Control System (Cont’d) EC-21 |