VARIABLE TUMBLE CONTROL SYSTEM (VTCS) OPERATION [L3]

BME014000140T30

• The PCM turns the variable tumble control solenoid valve ON to close the VTCS shutter valve in the intake manifold when all of the following conditions are met:

- Engine speed: below 3,500 rpm

- Throttle opening angle is below as followings:

Below 1,500 rpm: 35%

Between 1,500 rpm and 2,500 rpm: 25-35%

Above 2,500 rpm: 25%

- ECT sensor and TP sensor are not malfunctioning

• The PCM turns the variable tumble control solenoid valve OFF for maintaining the startability and stability during the engine cranking and for 0.2 second after engine started.