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Circuit/System 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. Remove the fuel fill cap. Connect the GE-41415-50  to the fuel tank filler neck. Connect the J 41413-200  to the GE-41415-50  . See Special Tools .
  2. Seal the EVAP system with the scan tool Purge Seal function.
  3. Pressurize the EVAP system with nitrogen to 5 inches H2O. Compare the Fuel Tank Pressure Sensor parameter to the J 41413-200  pressure/vacuum gage. See Special Tools . The FTP sensor should be within 1 inch H2O of the pressure/vacuum gage.
    • If the FTP is not within 1 inch H2O of the pressure/vacuum gage, replace the FTP sensor.
  4. Command the vent solenoid valve OPEN with a scan tool.
    • If the FTP sensor parameter is not 0 inch H2O, replace the FTP sensor.
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