A FAIL DETECTING METHOD FOR THE AIR FLOW SENSOR OF ENGINE IN VEHICLE

摘要

PURPOSE: A method is provided to detect a fail of an intake air detecting sensor depending on an engine load, which is calculated by using a differential output of intake air, an output of intake air and an intake air temperature. CONSTITUTION: When an engine is started(S100), it is determined whether a monitoring condition is satisfied(S110). If the monitoring condition is satisfied, a difference of an amount of intake air and an engine load are calculated(S120,S130). Then, it is determined whether the difference of the amount of intake air and the engine load are within a range of a critical value(S140). If the difference of the amount of intake air and the engine load are within the range of the critical value, a fail is determined(S150) so that a limp home mode is carried out(S180).