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Home >> Buick >> 2008 >> Allure CXL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.8L - DTC P0385 To DTC P2108 >> DTC P0446 >> Circuit/System Testing >> FTP Sensor
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FTP Sensor

  1. Ignition ON and fuel cap removed, verify that the FTP sensor parameter is between 1.3-1.7 volts.
    • If the FTP sensor parameter is not within the specified range, test the FTP low reference circuit for an open or high resistance. If the circuit tests normal, replace the FTP sensor.
  2. With the GE-41415-50  , connect the J 41413-200  to the fuel filler neck.
  3. Start the engine.
  4. Allow the engine to idle.
  5. Use the Purge/Seal function to seal the system with a scan tool.
  6. Command the EVAP canister purge solenoid valve to 30 percent.
  7. Observe the vacuum/pressure gage on the J 41413-200  and the FTP parameter on the scan tool.
  8. Allow the vacuum to increase on the gage of the J 41413-200  until it reaches approximately 16 inches H2O, or until the vacuum reached the abort limit on the scan tool.
    • If the difference between the FTP parameter on a scan tool and the vacuum/pressure gage on the J 41413-200  was more than 1 inch, replace the FTP sensor.
    • If the Fuel Tank Pressure Sensor parameter on a scan tool display was less than 3.2 volts, replace the FTP sensor.
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