Diagnostic device and method for an intake air temperature...

Details Diagnostic device and method for an intake air temperature... Diagnostic device and method for an intake air temperature...

2007-07-03

2010-10-26

McCall, Eric S (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Monitoring intake air system

C073S114770

Reexamination Certificate

active

07818997

ABSTRACT:
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 detected via the intake air temperature sensor (21) in a period from the startup of an internal combustion engine until the trend of change in the temperature of the air taken into the internal combustion engine becomes stable and a temperature detected via a water temperature sensor (22). If the decline in the temperature 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 (IAT1), the abnormality diagnosis is suspended.

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