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ENGINE OFF NATURAL VACUUM LEAKAGE CHECK FOR ONBOARD DIAGNOSTICS

  • US 20030061864A1
  • Filed: 10/01/2001
  • Published: 04/03/2003
  • Est. Priority Date: 10/01/2001
  • Status: Active Grant
First Claim
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1. A diagnostic system for detecting leaks in a vapor handling system of a vehicle, comprising:

  • a fuel tank;

    a pressure/vacuum sensor that senses pressure and vacuum in said fuel tank;

    a canister for recovering vapor from said fuel tank;

    a canister vent solenoid for selectively providing atmospheric air to said canister; and

    a controller connected to said canister vent solenoid and said pressure/vacuum sensor that executes a leakage detection test that detects leaks in said vapor handling system that have a minimum diameter on the order of 0.020 inch.

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