Diagnostic systems and methods for variable lift mechanisms...

Details Diagnostic systems and methods for variable lift mechanisms... Diagnostic systems and methods for variable lift mechanisms...

2011-04-12

2011-04-12

Kirkland, III, Freddie (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Fuel system or part thereof

C073S114430, C073S114790

Reexamination Certificate

active

07921701

ABSTRACT:
A lift mechanism diagnostic system comprises a fuel pump disabling module, a pressure module, and a diagnostic module. The fuel pump disabling module selectively disables a fuel pump that is driven by a camshaft. The pressure module determines a first pressure of fluid provided to a variable valve lift mechanism when the variable valve lift mechanism is operated in a first lift mode while the fuel pump is disabled and determines a second pressure of the fluid when the variable valve lift mechanism is operated in a second lift mode while the fuel pump is disabled. The diagnostic module selectively diagnoses a fault in the variable valve lift mechanism based on the first and second pressures.

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