There is provided a failure diagnostic system which includes an intake channel and an exhaust channel in communication with cylinders of an internal combustion engine; the exhaust pressure increasing device that increases the exhaust system pressure of the exhaust channel; an intake system pressure detecting device provided in the intake channel, for detecting the intake system pressure; and an exhaust pressure increase failure diagnostic section that determines whether the exhaust pressure increasing device has failed or not according to intake system pressure information obtained by the intake system pressure detecting device and a predetermined failure diagnosis reference range.

 
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< Valve operation controller

< Camshaft phase shifting mechanism

> Internal-combustion engine with a device for hydraulically adjusting the angle of rotation of the camshaft relative to the crankshaft and a vacuum pump for a servo load, especially a brake booster

> Desmodromic valve drive

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