Transmission Service Fast Learn Procedure

Automatic Transmission - 10L80 MHS MQC | Repair Instructions - On Vehicle | Document ID: 4538873 Diagnostic Instructions 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 Description The learn procedure performs a series of individual clutch applications which allows the control module K71 to learn initial clutch apply pressures. The control module uses the learn values for clutch control and timing of shifts. When to Perform the Procedure

Note

Failure to perform this procedure may result in poor system performance, DTCs being set, or customer dissatisfaction. This procedure is required when the following component has been repaired, replaced, removed, or serviced: K71 Transmission Control Module T12 Automatic Transmission Assembly Any condition/repair related to the following: Shift Quality Calibration Update or Software Update Clutch Assembly or Torque Converter Assembly Reference Information Scan Tool Reference Control Module References With Scan Tool

Warning

After releasing the parking brake, be sure the vehicle will not roll forward or backwards when removing the wheel blocks. If the vehicle is not in gear, the vehicle may move possibly causing personal injury.

Note

The Transmission Service Fast Learn procedure can also be performed through the Service Programming System (SPS) where the Transmission Fluid Temperature threshold may be displayed.

1. Perform the following steps: 1.1. Vehicle » Outside 1.2. Parking Brake » Applied 1.3. Drive Wheels » Blocked
2. Engine » Idling — At normal operating temperature.
3. Transmission Range » P
4. Verify the scan tool parameter is not available: Transmission Fluid Temperature
5. Select: Module Diagnostics
6. Select: Transmission Control Module
7. Select: Configuration/Reset Functions
8. Select: Transmission Service Fast Learn ⇒ If the scan tool parameter is available 8.1. Engine » Idling 8.2. Observe the scan tool parameter: ⇒ Transmission Fluid Temperature = Transmission Temperature is Above Operating Temperature » Perform the following procedure/test: Procedure 1 & Repeat step 8 ⇒ Transmission Fluid Temperature = Transmission Temperature is Below Operating Temperature » Perform the following procedure/test: Procedure 2 & Repeat step 8 ⇓ If the scan tool parameter is not available
9. Follow the instructions on the scan tool. Verify the scan tool procedure was successful. ⇒ If the procedure was not successful Refer to: Step 1 ⇓ If the procedure was successful
10. All OK. Procedure 1
11. Ignition/Vehicle » Off — For greater than 10 min
12. Engine » Idling — For 10 s Procedure 2

Warning

When performing a brake torque procedure, the vehicle must be parked outdoors away from any buildings, people, or other vehicles. Failure to follow these precautions may result in severe vehicle damage, and/or serious bodily injury.

1. Brake Pedal » Apply & Hold
2. Transmission Range » D
3. Engine Speed » 1,200 to 1,500 RPM — For 5 s
4. Engine » Idling — For 10 s
5. Transmission Range » P Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification