When a detection value of an intake pressure is normal, an electronically controlled throttle is controlled to attain a target intake pressure, a variable valve mechanism is controlled to attain a target intake air amount, and the control of the variable valve mechanism is corrected based on the detection value of the intake pressure. Contrary to this, when the detection value of the intake pressure is abnormal, the electronically controlled throttle is controlled to attain the target intake air amount, and also, the variable valve mechanism is controlled based on a fixed target opening characteristic.