• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis

For an overview of the component/system, refer to:Throttle Actuator Control (TAC) System Description

This procedure triggers the control module to learn the values of the component:Q38 Throttle Body—Airflow Adaptive Values

Perform this procedure when the following component has been serviced:

• Q38 Throttle Body—Cleaned/Replaced
• K20 Engine Control Module—Replaced

• DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0122, P0123, P0128, P0171, P0172, P0174, P0175, P0201–P0208, P0220, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0279, P0280, P0282, P0283, P0300–P0308, P0351–P0358, P0496, P0601, P0604, P0606, P060D, P0641, P0651, P0697, P06A3, P06D2, P1248, P1249, P124A, P124B, P1516, P16A0–P16A2, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P216B, P216C, P216E, P216F, P217B, P217C, P217E, P217F, P2176, P2300, P2301, P2303, P2304, P2306, P2307, P2309, P2310, P2312, P2313, P2315, P2316, P2318, P2319, P2321, P2322 = Not set
• Ignition=On
• Vehicle Speed Sensor=0 km/h (0 MPH)

Control Module References

1. Ignition » On / Vehicle » In Service Mode
2. Select:Module Diagnostics
3. Select:Engine Control Module
4. Select:Configuration/Reset Functions
5. Select:Reset Functions
6. Select:Throttle Body Idle Air Flow Compensation Reset
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

• 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/h (44 MPH)
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

• If in the specified range
11. All OK.

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification