Patent ID: 8281586

Claim:
A method to operate an electronically controlled internal combustion engine having an electronic control unit (ECU) with memory, a turbocharger with actively controllable boost output, and exhaust gas recirculation valve (EGR) to determine performance characteristics of said turbocharger, said turbocharger equipped with at least one of a wastegate and a variable geometry, comprising: determining whether the engine is operating at predetermined temperature and first predetermined engine speed (rpm) for a predetermined period of time; operating said engine at a second predetermined rpm; increasing engine load; closing said EGR value and comparing said turbocharger vane output position to a predetermined percentage of maximum vane output; determining ambient barometric pressure; determining intake manifold pressure; determining ratio of intake manifold pressure to ambient barometric pressure; determining whether said ratio of intake manifold pressure to ambient barometric pressure equals a predetermined pressure value; wherein said boost is controlled by vane position, said vane position adjusted to a predetermined vane position value in memory when the ratio of intake manifold pressure to ambient barometric pressure does not equal a predetermined pressure value when said turbocharger is equipped with said variable geometry.