Patent ID: 6330510
Filing Date: 2001-12-11
Classification: F02D

Abstract:
A diagnosing system for an engine comprising a selecting component for selecting either a first air-fuel mixture control component or a second air-fuel mixture control component according to operating condition of an engine;a combustion condition detecting component for detecting combustion condition of the engine; anddecision component for deciding a malfunction on the basis of a first combustion condition detected by the combustion condition detecting component in a state where the first air-fuel mixture control component is selected by the selecting component, and a second combustion condition detected by the combustion condition detecting component in a state where the second air-fuel mixture control component is selected by the selecting component, wherein the decision component decides that an air flow intensifying component for intensifying the flow of intake air is malfunctioning when the difference between the first combustion condition and the second combustion condition is not smaller than a predetermined value.