Service Fast Learn Adapts
Service Fast Learn Adapts is a 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. The scan tool provides
initiation of the Service Fast Learn Adapts procedure. This
procedure is to be used following transmission repair.
The Service Fast Learn Adapts procedure must be performed when
one of the following repairs have been made to the vehicle. Failure
to perform the procedure after one of the following repairs may
result in poor transmission performance, as well as transmission
DTCs being set:
| • |
Transmission internal service/overhaul |
| • |
Valve body repair or replacement |
| • |
Control solenoid valve assembly replacement |
| • |
TCM software/calibration update |
| • |
Any service in response to a shift quality
concern |
Note: Ensure the following
conditions are met before performing the Service Fast Learn Adapts
procedure:
| • |
Drive wheels are
blocked |
| • |
Parking brake is
applied |
| • |
Service brake is
applied |
| • |
Zero percent throttle and no
external engine RPM control |
| • |
Transmission fluid
temperature (TFT) is between
70-115°C (158-239°F) |
| • |
Transmission gear selector has
been cycled from Park to Reverse 3 times in order to purge air
from the reverse clutches. |
Note: If at any time during the
procedure, required conditions are not met, Service Fast Learn
Adapts may abort and the process may need to be started again from
the beginning. If this occurs, the transmission will be left in a
neutral state until the controller is shut down, key OFF and remove
the scan tool and wait for more than 30 seconds prior to
re-try procedure. If the procedure repeatedly fails, there is a
limit that engineering set is being exceeded and there is possibly
a transmission hardware issue.
- Use the scan tool to perform the Service Fast Learn
Adapts procedure. As the procedure is being performed, the scan
tool data display will provide operator instructions. Follow the
scan tool instructions as required.
- Once the procedure is complete, shut OFF the engine
and power down the TCM. You will lose communication to the scan
tool.
Ensure you exit back to the main screen in the scan tool, shut
the scan tool OFF, and unplug it from the DLC or the controller
will not shut down leaving the vehicle in a neutral state.
Note: When the Service Fast
Learn Adapts procedure is completed, the transmission will remain
in a neutral state until the controller shuts down. If after
1-2 minutes of sitting, with the key OFF and scan tool
removed, the vehicle remains in a neutral state, disconnect the
battery and wait 5-10 minutes and then hook the battery back
up. Reverse and drive should return.
- Restart the engine. This will complete the Service
Fast Learn Adapts procedure.
Fault diagnosis
If the Service Fast Learn Adapts will not run and the above
stated conditions have been met, ensure the following:
| • |
TFT is between 70-115°C (158-239°F). |
| • |
Brakes and brake switch are functioning
properly. |
| • |
Closed throttle and engine RPM increases above
1500 RPM while at entrance of the test. |
| • |
Park/Neutral position switch is properly adjusted
and functioning. |
| • |
Line pressure control is able to provide
1000 kPa and is within specifications. |
| • |
Vehicle is not moving, or vibrating
excessively. |
| • |
Clutches are properly assembled. |
|
