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Home >> Buick >> 2006 >> Lucerne CXS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 4.6L - DTC P0403 To DTC P1381 >> DTC P0454 >> Circuit/System Testing
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Circuit/System Testing

    IMPORTANT: Refer to the J 41413-200  operation information for detailed instructions.
  1. Start the engine with the J 41413-200  connected to the fuel filler neck.
  2. Allow the engine to idle.
  3. Use the Purge/Seal function to seal the system with a scan tool.
  4. Command the EVAP canister purge solenoid valve to 20 percent.
  5. Observe the vacuum/pressure gage on the J 41413-200  and the FTP parameter on the scan tool.
  6. 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.
  7. Use the Purge/Seal function to seal the system with a scan tool.
  8. If the difference between the FTP parameter on a scan tool and the vacuum/pressure gage on the J 41413-200  is more than 1 inch H2O, replace the FTP sensor.
  9. If the Fuel Tank Pressure Sensor parameter on a scan tool display is less than 3.2 volts, replace the FTP sensor.
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