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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0443 To DTC P3452 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P1516, P2101, P2119 Or P2176: Throttle Actuator Position Performance >> Circuit/System Verification

Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify DTC P0121, P0122, P0123, P0222, P0223, P0562, P0621, P0622 or P2135 is not set.
    NOTE: A low battery voltage or charging system condition may cause a DTC to set.
    • Go to next step: If none of the DTCs are set 
  3. Verify the scan tool Throttle Body Idle Air flow Compensation parameter is less than 90%.
    • Go to next step: If less than 90% 
  4. Clear the DTCs with a scan tool.
  5. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
  6. Ignition ON.
  7. Verify the scan tool TAC Motor parameter displays Enabled while slowly depressing the accelerator pedal.
    • If Enabled is not displayed 

      Refer to Circuit/System Testing below.

    • Go to next step: If Enabled is displayed 
  8. Verify DTC P1516, P2101, P2119 or P2176 is not set.
    • If any of the DTCs are set 

      Refer to Circuit/System Testing below.

    • Go to next step: If none of the DTCs are set 
  9. Verify the scan tool TAC Motor parameter displays Enabled while performing the Throttle Sweep Test with a scan tool.
    NOTE: If there is a condition with the throttle body, the TAC Motor Command parameter will go to 99% for a predetermined amount of time and then a DTC sets. Once a DTC is set, the TAC Motor Command parameter will go to 0% and the TAC Motor parameter will display Disabled.
    • If Enabled is not displayed 

      Replace the Q38 Throttle Body.

    • Go to next step: If Enabled is displayed 
  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 the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing below.

    • Go to next step: If the DTC does not set 
  12. All OK.
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