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Home >> Buick >> 2008 >> Allure CXS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0335 To DTC P2097 >> DTC P0451 >> Circuit/System Testing
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Circuit/System Testing

  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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