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Purge valve detachment diagnostic systems and methods

  • US 9,562,499 B2
  • Filed: 11/12/2014
  • Issued: 02/07/2017
  • Est. Priority Date: 08/29/2014
  • Status: Active Grant
First Claim
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1. A diagnostic system for a vehicle, comprising:

  • a purge valve control module that closes a purge valve that regulates fuel vapor flow from a fuel vapor canister to an intake system of an engine;

    a pump control module that, after the closing of the purge valve, turns on a pump that pumps fuel vapor toward the purge valve;

    a first pressure module that, after the purge valve is closed, determines a first pressure measured using a pressure sensor located between the pump and the purge valve;

    a second pressure module that, after the determination of the first pressure and while the pump is on, determines a second pressure measured using the pressure sensor located between the pump and the purge valve; and

    a diagnostic module that selectively diagnoses detachment of the purge valve from the intake system based on the first and second pressures.

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