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Component Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Seal the EVAP system with the scan tool EVAP Purge/Seal function.
  2. Pressurize the EVAP system to 5 inches H2O.
  3. Compare the Fuel Tank Pressure sensor parameter with a scan tool to the J 41413-200  pressure/vacuum gage. See Special Tools . The scan tool FTP sensor parameter should be within 1 inch H2O of the pressure/vacuum gage.
  4. Command the EVAP vent valve open with a scan tool. Verify the scan tool Fuel Tank Pressure parameter decreases to 0 inches H2O.
    • If the FTP sensor parameters do not respond to the change in pressure, replace the FTP sensor.
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