VARIABLE TUMBLE CONTROL OPERATION [ZY, Z6]

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Operation conditions

• When all of the following conditions are met, the PCM energizes the closed-side circuit of the variable tumble shutter valve actuator. As a result, the variable tumble shutter valve closes.

― Engine speed is less than 3,250 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)

― Charging efficiency is at specified value or less.

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.