Gm Global Technolgoy Operations, Inc.

Lawrence O Murray

David R Staley

Igor Anilovich

Morena Bruno

Kevin J Storch

Ian J Mac Ewen

David Edward Prout

Martin L Hall

Julia C Grow

Richard A Van Camp

Colin S Yager

A control system includes an oil pump module and a diagnostic module. The oil pump module, based on engine operating conditions, selectively generates a first mode request signal to initiate a first transition from operating an oil pump of an engine in one of a first pressure mode and a second pressure mode to operating the oil pump in another one of the first pressure mode and the second pressure mode. The second pressure mode is different from the first pressure mode. The diagnostic module, based on when a driver starts the engine, selectively generates a second mode request signal to initiate consecutive transitions from operating the oil pump in the second pressure mode to operating the oil pump in the first pressure mode. The diagnostic module diagnoses a pump fault when a first oil pressure change associated with the consecutive transitions is less than a first predetermined pressure change.

Control and diagnostic systems for a variable capacity engine oil pump and an engine oil pressure sensor

A control module and method for an exhaust system of an engine can include a secondary air intake (SAI) pressure module that monitors SAI pressure. An accumulation module can accumulate an SAI string length based on the monitored SAI pressure. A calculation module can determine an average SAI string length based on the accumulated SAI string length. A determination module can determine an operating characteristic of the vehicle exhaust based on the average SAI string length.

Algorithm to diagnose leaks or blockages downstream of the secondary air injection reaction (SAIR) pressure sensor

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White Lake, MI, United States of America

Lawrence O Murray