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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - Repair Instructions) >> Repair Instructions >> Throttle Body Idle Air Flow Compensation Reset >> With Scan Tool

With Scan Tool

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 / Vehicle - In Service Mode
  2. Select:Module Diagnostics
  3. Select:Engine Control Module
  4. Select:Configuration/Reset Functions
  5. Select:Learn Functions
  6. Select:Idle Learn
  7. Follow the instructions on the scan tool.
  8. Verify the scan tool parameter:Throttle Body Idle Air Flow Compensation = 0 %
    • If greater than 0 

      Repeat step 1

    • Go to next step: If 0 
  9. Engine - Idling - At normal operating temperature
  10. Verify the scan tool parameter:Engine Speed= - 100 to + 200 RPM of the Desired Idle Speed
    • {Test failed 1 time(s)} If not in the specified range 
    1. Engine idling. - For greater than 3 min
    2. Ignition/Vehicle - Off - For greater than 1 min
    3. Engine idling. - For greater than 3 min
    4. Repeat step 9
    • {Test failed 2 time(s)} If not in the specified range 
    1. Perform the following action:Road test the vehicle.
    2. Vehicle Speed - Greater than 70 km (44 mi)
    3. Decelerate - For 2 s
    4. Repeat step 10.2 - 3 times
    5. Engine idling. - For greater than 3 min
    6. Repeat step 9
    • Go to next step: If in the specified range 
  11. All OK.
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