SFI SYSTEM


  1. OPERATION


    1. EURO VI Models


      1. The fuel pump is controlled by the ECM using the fuel pump control ECU assembly. Based on the signal received from the ECM, the fuel pump control ECU assembly controls the power supplied to the fuel pump to 2 levels (low and high). Battery voltage is directly supplied to the fuel pump for high. However, for low, Pulse Width Modulation (PWM) control is used to control the power supplied. This contributes to fuel economy by reducing current consumption compared to conventional control, which operates by switching a resistor in and out of the circuit. The fuel pump control system has a fuel cut control function. Fuel cut control stops the fuel pump when any of the SRS airbags has deployed.


        • When the ECM detects the airbag deployment signal from the airbag sensor assembly, the ECM will turn the EFI main relay off. After fuel cut control has been activated, turning the ignition switch from off to ON cancels fuel cut control, and the engine can be restarted.

          A01KVJBE01

    2. EURO IV Models


      1. The fuel pump is controlled by the ECM. Fuel pump control has a fuel cut control function. Fuel cut control stops the fuel pump when any of the SRS airbags has deployed.


        • When the ECM detects the airbag deployment signal from the airbag sensor assembly, the ECM will turn the circuit opening relay off. After fuel cut control has been activated, turning the ignition switch from off to ON cancels fuel cut control, and the engine can be restarted.

          A01KVTSE01