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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 508 (Engine Controls/Fuel - 5.3L, 6.0L, 6.2L - DTC P0420 To DTC P3449 And Diagnostic Information And Procedures) >> 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 or produce smoke from a leak.
  • Refer to the GE 41413-A  Evaporative Emissions System Tester (EEST) 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  EVAP Service Port Vent Fitting. Connect the GE 41413-A  Evaporative Emissions System Tester (EEST) to the vehicle EVAP service port adapter.
  2. Seal the system with a scan tool and use the flow meter on the GE 41413-A  Evaporative Emissions System Tester (EEST), calibrated to 0.51 mm (0.020 in) to determine that there is no leak in the EVAP system.
    • If a leak is detected, use the GE 41413-A  Evaporative Emissions System Tester (EEST) 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. To test for a restriction, connect the GE 41413-A  Evaporative Emissions System Tester (EEST) 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 purge solenoid valve to 30 %.
  6. The vacuum/pressure gauge on the GE 41413-A  Evaporative Emissions System Tester (EEST) and the FTP parameter on the scan tool should both show vacuum.
    • If the vacuum/pressure gauge shows vacuum, but the FTP parameter does not show vacuum, replace the B150 Fuel Tank Pressure 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 V, and the values are similar between the scan tool and the vacuum/pressure gauge on the GE 41413-A  Evaporative Emissions System Tester (EEST).
    • If the values are not similar, or the voltage did not reach 3.2 V, replace the B150 Fuel Tank Pressure Sensor.
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