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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 252 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L, Or 6.2L - DTC P0230 To DTC P0690) >> 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  operation manual for detailed instructions in Evaporative Emission System Diagnosis .
  1. Connect the J 41413-200  to the vehicle EVAP service port. See Special Tools . For vehicles without a service port, disconnect the purge tube at the quick connector on the EVAP canister side of the purge solenoid valve and install the CH-48096  . See Special Tools .
  2. Use a scan tool to seal the EVAP system.
  3. Use the flow meter on the J 41413-200  , calibrated to 0. See Special Tools .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  to apply smoke to the EVAP system at the service port or the purge tube until the leak is located using the J 41413-SPT  . See Special Tools .
  4. To test for a restriction in the purge path, 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  . See Special Tools . Connect the J 41413-311  to the disconnected hose on the GE-41415-50  . See Special Tools . Install the GE-41415-50  filler neck end only to the vehicle. See Special Tools .
  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 30 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. Refer to Evaporative Emissions Hose Routing Diagram .
  9. Verify that the vacuum increases to the abort limit on the scan tool or more than 3.2 volts, and the values are 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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