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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 6.2L - DTC P0010 To DTC P0232 >> DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135 >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON, observe the scan tool TP sensor 1 voltage parameter. The reading should be between 4.75-0.33 volts and change with accelerator pedal input.
  2. Ignition ON, observe the scan tool TP sensor 2 voltage parameter. The reading should be between 0.25-4.59 volts and change with accelerator pedal input.
  3. Ignition ON, observe the scan tool TP sensor 1 and 2 parameter. The scan tool should indicate agree.
  4. Clear the DTCs with the scan tool. Operate the vehicle within the Conditions for Running the DTC, or within the conditions that you observed from the Freeze Frame/Failure Records.
  5. Verify that DTC P0120 or P0220 are not the only throttle position DTCs set.
    • If DTC P0120 or P0220 are the only DTCs set, replace the ECM.
  6. Verify that DTCs P0641 or P0651 are not set.
  7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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