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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 364 (Engine Controls And Fuel - 5.3L, 6.0L & 6.2L - DTC P0443 Through DTC P3449 And Troubleshooting) >> Diagnostic Information and Procedures >> DTC P0455 >> Circuit/System Testing

Circuit/System Testing

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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  evaporative emissions system tester operation manual for detailed instructions in Evaporative Emission System Diagnosis .
  1. Disconnect the purge tube at the quick connector on the EVAP canister side of the purge solenoid valve and install the CH-48096  service access port tool service port adapter tool. Connect the J-41413-200  evaporative emissions system tester to the vehicle EVAP service port adapter.
  2. Seal the system with a scan tool and use the flow meter on the J 41413-200 , calibrated to 0.51 millimeter (0.020 inch) to determine that there is no leak in the EVAP system.
    • If a leak is detected, use the J-41413-200  evaporative emissions system tester to apply smoke to the EVAP system at the service port or the purge tube until the leak is located using the GE-41413-SPT  high intensity white light.
  3. Connect the J-41413-200  evaporative emissions system tester nitrogen/smoke hose to the J-41413-311  EVAP Plug brass cone adapter. Disconnect the hose at the fuel cap end of the GE-41415-50  fuel tank cap adapter. Connect the J-41413-311  EVAP Plug to the disconnected hose on the GE-41415-50  fuel tank cap adapter. Install the GE-41415-50  fuel tank cap adapter filler neck end only to the vehicle.
  4. Engine idling, command Purge/Seal function to seal the system with a scan tool.
  5. Command the EVAP canister purge solenoid valve to 30 percent.
  6. The vacuum/pressure gauge on the J-41413-200  evaporative emissions system tester and the FTP parameter on the scan tool should display vacuum.
    • If the vacuum/pressure gauge shows vacuum, but the FTP parameter does not show vacuum, replace the FTP sensor.
    • If neither the FTP parameter nor the vacuum/pressure gauge shows vacuum, repair the restriction in the purge path.
  7. Verify that the vacuum increases to the abort limit on the scan tool, greater than 3.2 volts, and the values are similar between the scan tool and the vacuum/pressure gauge on the J-41413-200  evaporative emissions system tester.
    • If the values are not similar, or the voltage did not reach 3.2 volts, replace the FTP sensor.
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