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Home >> Hummer >> 2009 >> H3 Base, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 3.7L - DTC P0324 To DTC P0446 >> DTC P0455 >> Circuit/System Testing
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Circuit/System Testing

IMPORTANT:
  • Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
  • Refer to the J 41413-200  operation manual for detailed instructions in Evaporative Emission System Diagnosis . See Special Tools .
  1. Disconnect the purge tube at the quick connector on the EVAP canister side of the purge solenoid valve and install the CH-48096  . Connect the J 41413-200  to the CH-48096  . See Special Tools .
  2. Use a scan tool to seal the system and use the flow meter on the J 41413-200  , calibrated to 0. See Special Tools .51 mm (0.020 in) to determine that there is no leak in the EVAP system.
    • If a leak is detected use the J 41413-200  to apply smoke to the EVAP system at the service port or the filler neck until the leak is located. See Special Tools .
  3. Connect the J 41413-200  nitrogen/smoke hose to the J 41413-311  brass cone adapter. Disconnect the hose at the fuel cap end of the GE-41415-50  . Connect the J 41413-311  to the disconnected hose on the GE-41415-50  . Install the GE-41415-50  filler neck end only to the vehicle.
  4. Start the engine.
  5. Allow the engine to idle.
  6. Use the Purge/Seal function to seal the system with a scan tool.
  7. Command the EVAP canister purge solenoid valve to 20 percent.
  8. The vacuum/pressure gage on the J 41413-200  and the FTP parameter on the scan tool should both show vacuum. See Special Tools .
    • If the vacuum/pressure gage shows vacuum but the FTP parameter does not show vacuum, replace the FTP sensor.
    • If neither the FTP parameter nor the vacuum/pressure gage shows vacuum, repair the restriction in the purge path.
  9. Verify that the vacuum increases to the abort limit on the scan tool or more than 3.2 volts, and the value is similar between the scan tool and the vacuum/pressure gage on the J 41413-200  . See Special Tools .
    • If the values are not similar or the voltage did not reach 3.2 volts, replace the FTP sensor.
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