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ENGINE-OFF NATURAL VACUUM TESTING FOR VARIABLE DISPLACEMENT ENGINE VEHICLES

  • US 20160032872A1
  • Filed: 07/29/2014
  • Published: 02/04/2016
  • Est. Priority Date: 07/29/2014
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • adjusting an evaporative emissions leak test parameter based on a ratio of cylinder run time of a deactivatable cylinder of an engine, to vehicle run time; and

    indicating degradation based on the adjusted parameter.

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