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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 >> Fuel Composition Diagnosis >> Circuit/System Testing - J 44175 Ethanol Content More Than 15 Percent

Circuit/System Testing - J 44175 Ethanol Content More Than 15 Percent

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    All fuel will need to be removed from the fuel tank. Any fuel left over may increase the ethanol content of the ASTM gasoline being introduced which could lead to incorrect future ethanol calculations.

  1. Drain the fuel tank. Refer to Fuel Tank Draining (Dual Tanks - Front) , Fuel Tank Draining (Dual Tanks - Rear) , Fuel Tank Draining (Single Tank) .
  2. Clean the fuel system. Refer to Fuel System Cleaning .
  3. Add fuel containing 10 percent or less ethanol content.
  4. Operate the vehicle until at least 1 liter (0.3 gallon) is used.
  5. Measure the ethanol content with a fuel sample from the fuel rail using the J 44175  Tester. The measured ethanol content should be less than 15 percent.
    • If not within the specified range, repeat steps 1 through 5.
  6. Perform the Fuel Composition Reset using the scan tool.
  7. Perform the Fuel Trim Reset using the scan tool.
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