#
VARIABLE TUMBLE CONTROL SYSTEM (VTCS)

id011300119900

## Outline

• The function of the VTCS is essentially carried over from that of the current Mazda6 (GG, GY) models, except for the following:

  - A motor-type shutter valve actuator has been adopted. The shutter valve actuator receives the VTCS operation signal from the PCM.
  - The operation condition has been changed.

## Structure

• The VTCS is composed of the VTCS shutter valve actuator and VTCS shutter valve.
System diagram

## Operation

### Engine speed approx. 3,250 rpm or less (VTCS shutter valve closed)

  • The VTCS shutter valve closes by the operation of the VTCS shutter valve actuator. At this time, the intake air passage is narrower than normal, and the intake airflow speed increases together with the creation of strong air tumble in the combustion chamber.