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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 104 (Engine Controls And Fuel - 6.0L (L96 LC8) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P0506 or P0507 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. 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. 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.

  5. Verify the actual Engine Speed is not 100 RPM less than the Desired Idle Speed.
    • 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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