ENGINE VARIABLE OIL PUMP DIAGNOSTIC METHOD
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United States of America Patent
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Jun 27, 2019
app pub date -
Dec 22, 2017
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Dec 22, 2017
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Abstract
Methods and systems are provided for diagnosing the functioning of a variable displacement oil pump. In one example, a method may include commanding a change in displacement of the variable displacement oil pump during a vehicle keyed-off condition and diagnosing a degradation of the oil pump based on a corresponding change in an estimated crankcase pressure.
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