Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
A/T Controls - Service Fast Learn Adapts Characteristics
2009 Chevrolet HHR L4-2.4LSECTION A/T Controls - Service Fast Learn Adapts Characteristics
INFORMATION
Bulletin No.: 08-07-30-039
Date: August 21, 2008
Subject:
Information on Automatic Transmission Service Fast Learn Adapts (SFL) Characteristics
Models:
2009 GM Passenger Cars and Light Duty Trucks (including Saturn)
2009 HUMMER H2
with 6T40/45, 6T70/75, 6L50, 6L80 or 6L90 Automatic Transmission
Service Fast Learn Adapts is a Tech2(R) procedure for 6 speed automatic transmissions in which a series of tests are run to allow the transmission control module (TCM) to learn individual clutch characteristics. Once the clutch data is learned, Service Fast Learn Adapts translates it into the adaptive data cells, which the TCM uses for clutch control during shifts.
When running this Tech2(R) procedure, in the service stall with the service brake applied and the park brake set, the engine RPM may drop severely or the engine may stall at the end of the test. This stall condition may only occur when running this service procedure. This is a normal condition and no repair attempts should be made to correct this.
If the engine stalls and the Tech2(R) indicates that the procedure was completed successfully there is no need to repeat the procedure. Follow the steps below:
1. Place the transmission in Park.
2. Exit the Service Fast Learn Adapts Procedure on the Tech 2(R).
3. Turn the ignition key to the OFF position.
If the engine stalls and the Tech2(R) indicates that the procedure was aborted or not completed successfully, the procedure will need to be repeated. Follow the steps below:
1. Place the transmission in Park.
2. Exit the Service Fast Learn Adapts Procedure on the Tech 2(R).
3. Turn the ignition key to the OFF position.
4. Open the vehicle door with the ignition key still in the OFF position and wait at least 30 seconds before starting the vehicle or using the Tech2(R).
Important:
Failure to properly exit a successful, aborted or unsuccessful procedure can result in setting transmission DTCs and a no drive condition. Clear all DTCs before repeating the Service Fast Learn Adapts procedure.
Disclaimer
Bulletin No.: 08-07-30-039
Date: August 21, 2008
Subject:
Information on Automatic Transmission Service Fast Learn Adapts (SFL) Characteristics
Models:
2009 GM Passenger Cars and Light Duty Trucks (including Saturn)
2009 HUMMER H2
with 6T40/45, 6T70/75, 6L50, 6L80 or 6L90 Automatic Transmission
Service Fast Learn Adapts is a Tech2(R) procedure for 6 speed automatic transmissions in which a series of tests are run to allow the transmission control module (TCM) to learn individual clutch characteristics. Once the clutch data is learned, Service Fast Learn Adapts translates it into the adaptive data cells, which the TCM uses for clutch control during shifts.
When running this Tech2(R) procedure, in the service stall with the service brake applied and the park brake set, the engine RPM may drop severely or the engine may stall at the end of the test. This stall condition may only occur when running this service procedure. This is a normal condition and no repair attempts should be made to correct this.
If the engine stalls and the Tech2(R) indicates that the procedure was completed successfully there is no need to repeat the procedure. Follow the steps below:
1. Place the transmission in Park.
2. Exit the Service Fast Learn Adapts Procedure on the Tech 2(R).
3. Turn the ignition key to the OFF position.
If the engine stalls and the Tech2(R) indicates that the procedure was aborted or not completed successfully, the procedure will need to be repeated. Follow the steps below:
1. Place the transmission in Park.
2. Exit the Service Fast Learn Adapts Procedure on the Tech 2(R).
3. Turn the ignition key to the OFF position.
4. Open the vehicle door with the ignition key still in the OFF position and wait at least 30 seconds before starting the vehicle or using the Tech2(R).
Important:
Failure to properly exit a successful, aborted or unsuccessful procedure can result in setting transmission DTCs and a no drive condition. Clear all DTCs before repeating the Service Fast Learn Adapts procedure.
Disclaimer
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.