Diagnostic apparatus for variable valve control system

Details Diagnostic apparatus for variable valve control system Diagnostic apparatus for variable valve control system

2006-12-12

2006-12-12

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Vehicle chassis

Steering

C073S116070, C073S117020, C073S118040

Reexamination Certificate

active

07146851

ABSTRACT:
ECU calculates variations of air-fuel ratios of respective cylinders and variations of air-fuel ratios of all the cylinders in variable intake valve lift devices of two cylinder groups. Presence and absence of an abnormality is determined on the basis of whether ratios of variations of air-fuel ratios of respective cylinders to variations of air-fuel ratios of all the cylinders are less than an abnormality threshold. Whether which of variable intake valve lift devices of the cylinder groups is abnormal is determined from control modes of the variable intake valve lift devices of the respective cylinder groups, and the relationship between that cylinder group, to which a cylinder being maximum in air-fuel ratio belongs, and cylinder group, to which a cylinder being minimum in air-fuel ratio belongs.

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