VARIABLE TUMBLE CONTROL OPERATION [L8, LF]

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Operation conditions

• When all of the following conditions are met, the PCM energizes the coil of variable tumble solenoid valve. As a result, negative pressure is introduced to the diaphragm chamber of the variable tumble shutter valve actuator, pulling the actuator rod and closing the variable tumble shutter valve.

  ― Engine speed less than 3,750 rpm
  ― Engine coolant temperature less than 60 °C {140 °F}
  ― Throttle valve opening angle is at the specified value or less (changes according to engine speed)

Inhibition conditions

• When a DTC for the ECT sensor or TP sensor has been stored, the variable tumble control is inhibited and the variable tumble shutter valve is constantly open.