SFI SYSTEM


  1. OPERATION


    1. The exhaust change valve driver receives signals from the opening angle sensor built into the exhaust pipe gas control actuator sub-assembly and sends exhaust change valve status signals to the ECM. The exhaust change valve driver operates the drive motor built into the exhaust pipe gas control actuator sub-assembly according to open/close command signals from the ECM causing the exhaust change valve to open and close.

    2. When the exhaust change valve is closed, exhaust gas is passed through the silencer and discharged to ensure quietness. When the exhaust change valve is open, a large amount of exhaust gas is directly discharged to emphasize the exhaust sound.

      A004DHLC01
      *1 Exhaust Change Valve *2 Exhaust Pipe Gas Control Actuator Sub-assembly
      *3 Silencer - -
      *a Exhaust Change Valve Closed *b Exhaust Change Valve Open
      *c Exhaust Gas *d To Main Muffler
      *e To Exhaust Gas Outlet - -

    3. While Vehicle is Stopped


      1. When Engine is Stopped/Started/Idling

        Engine Condition Exhaust Change Valve
        Stopped (Engine Switch Off) Fully Open
        Started Fully Open → Fully Closed Approximately 5 Seconds after Engine Start Determined
        Idling Fully Closed
        Stopped (Engine Switch On (IG) → Engine Switch Off) Fully Closed → Fully Open

      2. When Engine Speed is High

        Engine Condition Exhaust Change Valve
        Shift Position in N or P Range Upswing in Engine Speed 4600 rpm or more Fully Open
        Drop in Engine Speed 4400 rpm or less Fully Closed
        A004E2VE02
        *1 Fully Open
        *2 Exhaust Change Valve Opening Angle
        *3 Fully Closed
        *4 Engine Speed (rpm)

    4. When Vehicle is being Driven

      Engine Condition Exhaust Change Valve
      During Acceleration 4600 rpm or more Fully Open
      During Deceleration 3400 rpm or less Fully Closed
      A004DWKE03
      *1 Fully Open
      *2 Exhaust Change Valve Opening Angle
      *3 Fully Closed
      *4 Engine Speed (rpm)

    5. Blipping Control-linked Operation


      1. When blipping control for automatic transmission control is performed, the exhaust change valve is opened and closed as follows:

        Operating Condition Exhaust Change Valve

        The following conditions are all met:


        • Vehicle speed is 45 km/h or more

        • Engine speed is 4600 rpm or less

        • Downshifting

        Exhaust Change Valve Opened

        ↓

        Fully Opened Condition Maintained for Approximately 3 Seconds

        ↓

        Exhaust Change Valve Closed

    6. Driver Intention/Driving Scene Support Control-linked Operation


      1. When driver intention/driving scene support control for automatic transmission control is performed, the exhaust change valve is opened and closed in accordance with driver intention/driving scene support control.