VARIABLE TUMBLE CONTROL OPERATION [LF, L5]

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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 is less than 3,750 rpm.

― Engine coolant temperature is less than 63°C {145°F} (LF)/60°C {140°F} (L5).

― 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.

― DTC has been stored for the ECT sensor.

― DTC has been stored for the TP sensor.