With Scan Tool

Ignition - On / Vehicle - In Service Mode
Select: Module Diagnostics
Select: Engine Control Module
Select: Configuration/Reset Functions
Select: Reset Functions
Select: Throttle Body Idle Air Flow Compensation Reset
Follow the instructions on the scan tool.
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
Engine - Idling - At normal operating temperature
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
- {Test failed 3 time (s)}If not in the specified range
  Refer to: Diagnostic System Check - Vehicle
- Go to next step: If in the specified range
All OK.