The following deals with replacement
of the mechatronics unit - that is, the valve body and control unit:
The new mechatronics
unit is supplied complete with flashed software and a parameter set matching
the vehicle. The adaption values for clutch calibration are in their default
settings (predefined value).
After replacing the
mechatronics unit a complete basic calibration of the gearbox is necessary, so
a basic setting should be carried out.
Position sensors /
synchronous body position:
The position sensor
calibration is begun by selecting channel 61. Once the end
positions have been calibrated (pay attention to readout!), the next
Selecting channel 60
initiates the next calibration - of the synchronous body positions (synchronous
points). Only when these two calibrations (channels 61 and 60)
have been successfully completed is the basic calibration classified as passed.
Clutch adaption: (clutch
safety function, main pressure)
Software version <
setting with selection of channel 62.
The setting is made just low enough so that no torque is transmitted.
Software version >=
0800: A clutch adaption at standstill is not necessary here, though
rapid adaption needs to be initiated by selecting channel 67 (sets the
adaption values to predefined values).
As generally nothing is
known of the history of the new mechatronics unit, the values of the clutch
safety function are reset by selecting channel 68.
Also, the values for
automatic main pressure adaption should be reset to their default values
(predefined values). This is done by selecting channel 65.
The adaption itself is
carried out later automatically during driving.
The fitting of steering
wheel paddles is checked and stored by the gearbox control unit. If a new
control unit is fitted, it is necessary to select channel 63 in order to
reset this fitting information to "not recognised". This
initiates the procedure for recognition of the steering wheel paddles, and a
corresponding entry is made permanently in the fitting information. The same
principle applies to detection of the ESP and touch-control cruise control
variants fitted in the vehicle. This information is reset by selecting channel 69.
At the very end of the
test procedure, if passed successfully, the fault memory should be erased. If
failed, its contents should be saved.
Defined adaption test
Recommendation for a
test drive and further checks after replacing the mechatronics and successfully
performing basic setting.
temperature > 30°C < 100° C
J Drive in Tiptronic from
standing start up to 6th gear. Drive
repeatedly in each of 3rd, 4th ,5th and 6th gears for at least 2 minutes under
J Engine speed
window for all gears 1500 - 3000 rpm.
J Perform 1
sharp braking followed by full-throttle acceleration (to check oil return)
J Manoeuvring with
assessment of creepage and starting-off
J Check for leaks
If the test drive cannot
be undertaken in the way recommended or for the period recommended, the fast
adaptations still outstanding are undertaken automatically and unnoticeably in
the subsequent driving cycles.
Summary of actions
1. Channel 61
- Calibrate gearbox tolerances (Engaged calibration)
2. Channel 60
– Calibrating the gearbox tolerances with reference to the position of the gear
selector (measurement of synchronising point)
3a) Software version < 0800 à Channel 62
- Calibration of clutch adaption at standstill
3b) Software version >= 0800 à Channel 67
- The values for the clutch adaption are reset.
4) Channel 68 -
Reset values for clutch safety function
5. Channel 65
- Reset values for automatic main pressure adaption to defaults
6. Channel 63
- Reset "Steering wheel paddles" fitting info to "not
7. Channel 69
- Reset "ESP and TouchCCS" fitting info to "not recognised"
fault memory and erase if test passed
9. Defined test
CCS - Cruise control
ESP - Electronic Stability Program