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Home >> Chevrolet >> 2009 >> Traverse LS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0192 To DTC P0629 >> DTC P0455 or P0497 >> Circuit/System Testing >> Blockage/Restriction Testing
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Blockage/Restriction Testing

  1. 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 using the EVAP Purge/Seal function with a scan tool.
  3. Pressurize the EVAP system with nitrogen to 9.33 mm/Hg (5 in/H2O). Compare the scan tool Fuel Tank Pressure Sensor parameter to the J 41413-200  pressure/vacuum gage. See Special Tools . The FTP sensor parameter should be within 1.86 mm/Hg (1 in/H2O) of the pressure/vacuum gage.
    • If not within the specified range, replace the FTP sensor.
  4. Command the EVAP purge solenoid to 100 percent with a scan tool. The scan tool FTP sensor parameter should drop to less than 1.86 mm/Hg (1 in/H2O).
    • If greater than the specified value, disconnect the EVAP pipes listed below one at a time while observing the scan tool FTP sensor parameter. If the FTP sensor parameter drops to less than the specified when a pipe is disconnected, repair the blockage or restriction in one of the following EVAP pipe/hoses:
      • EVAP purge vacuum source from the EVAP purge solenoid
      • EVAP purge pipe from the EVAP purge solenoid
      • EVAP purge pipe at the EVAP canister
      • EVAP vapor pipe at the EVAP canister
  5. If a condition with the EVAP system cannot be located, refer to Diagnostic Aids for additional information.
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