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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 P0506 Or P0507: Idle Speed >> 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 there are no other DTCs set.
    • Go to next step: If no other DTCs are set 
  3. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90 %.
    • Go to next step: If less than 90 % 
  4. Engine Idling at the normal operating temperature.
  5. Verify the actual Engine Speed is not 100 RPM less than the Desired Idle Speed.
    NOTE: The engine must run for greater than 60 s, then idle at a steady state for an additional 10 s before comparing the actual and desired engine speed parameters.
    • If 100 RPM less than the Desired Idle Speed 

      Refer to Circuit/System Testing.

    • Go to next step: If 100 RPM greater than the Desired Idle Speed 
  6. Verify the actual Engine Speed is not 200 RPM greater than the Desired Idle Speed.
    • If 200 RPM or greater than the Desired Idle Speed 

      Refer to Circuit/System Testing.

    • Go to next step: If within 200 RPM of the Desired Idle Speed 
  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.
  8. Verify a DTC does not set.
    • Go to next step: If no DTC sets 
  9. All OK
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