LEMON Manuals: Even more car manuals for everyone
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 P2120, P2122, P2123, P2125, P2127, P2128, or P2138 >> Circuit/System Verification

Circuit/System Verification

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.
  1. Ignition ON.
  2. Verify DTC P0641 or P0651 is not set.
    • If none of the DTCs are set 
  3. Verify the scan tool APP Sensor 1 voltage parameter is between 0.46-4.75 V and changes with accelerator pedal input.
    • If not between 0.46-4.75 V or does not change 

      Refer to Circuit/System Testing

    • If between 0.46-4.75 V and changes 
  4. Verify the scan tool APP Sensor 2 voltage parameter is between 0.32-2.6 V and changes with accelerator pedal input.
    • If not between 0.32-2.6 V or does not change 

      Refer to Circuit/System Testing

    • If between 0.32-2.6 V and changes 
  5. Verify the scan tool APP Sensor 1 and 2 Agree/Disagree parameter displays Agree while performing the tests listed below:
    • Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release pedal. Repeat the procedure several times.
    • Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times.
    • If Disagree 

      Refer to Circuit/System Testing

    • If Agree 
  6. Verify that DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138 is not set.
    • If any of the DTCs are set 

      Refer to Circuit/System Testing

    • If none of the DTCs set 
  7. 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.
  8. Ignition ON.
  9. Verify DTC P2120 or P2125 are not the only APP sensor DTCs set.
    • If DTC P2120 or P2125 are the only DTCs set 
    • Replace the engine control module.
    • If DTC P2120 or P2125 are not set 
  10. 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.
  11. Verify a DTC does not set.
    • If no DTCs set 
  12. All OK
scientia non olet · About LEMON Manuals