• 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 is less than 3,750 rpm.
― Engine coolant temperature is less than 60°C {140°F}.
― Throttle valve opening angle is at specified value or less (changes according to engine speed)
Inhibition conditions
• When any one of the following conditions are met, the variable tumble control is inhibited and the variable tumble shutter valve is constantly open.