DIAGNOSTIC DEVICE AND METHOD FOR AN INTAKE AIR TEMPERATURE SENSOR OF AN INTERNAL COMBUSTION ENGINE

摘要

An abnormality diagnostic device diagnoses the presence/absence of abnormality of an intake air temperature sensor (21) on the basis of the magnitude of deviation between the lowest temperature of the intake air (IATMIN) detected via the intake air temperature sensor (21) in a period (t?-tl) from the startup of an internal combustion engine until the trend of change in the temperature (IAT) of the air taken into the internal combustion engine becomes stable and a temperature (ECT) detected via a water temperature sensor (22). If the decline in the temperature (IAT) of the intake air detected via the intake air temperature sensor (21) within the aforementioned period is greater than or equal to a predetermined criterion value (Delta IATl), the abnormality diagnosis is suspended.