Mini Cooper CVT Adaptation

 Every week we get many phone calls to ask us " How we perform the Adaptation on the Mini Cooper " and the first question we ask, what for diagnostic Tools you have ??
To make it clear, if you NOT have the proper Diagnostic tools you do not have any other joys as to bring the car to the Dealer ship for help.
It is not a option, if you wont to work on the Mini cooper you need to have the BMW Diagnostic Tool GT1 or INPA, there is NO aftermarket tool on the market that can perform Adaptation or clutch reset, life data reset on so on, don't waist your and your customers time. If this is understood we can go and perform the Adaptation.
After every repair or transmission change or after you notice a funny behavior you need to perform a so called "Adaptation procedure". Because of change of tolerances the transmission starts to shift funny, many Car owners don't know what is going on with there car and keep on driving to this point the rile have a problem, in stet to perform a new "learning procedure" I believe, the car owner get in problems because the manufacturer mist to educate the car owner about this new transmission type.
Before I explain now how you perform the adaptation successively keep in mind that my your car still will not run or up shift properly because of many other problems you can have specially after a heavy repair oft the CVT transmission. The most failures we found after a complete transmission repair is the wrong assembly of the 'Pitot tubes"  and the failure of the Stepper Motor. But as I explained before with the right tools you can test all the functions  inside of the transmission and find the non working part, but this is a complete different chapter I will explain in a separate article, now we perform a adaptation.
I am not sure if I have to explain to you that the Mini Cooper with the cvt transmission has NO transmission control unit, that what many people think is the control unit for the transmission  is axially only a translator between engine and transmission The control of the transmission is integrated with the Engine control unit ( EMS 2000)  and a GIU enables the integration by acting as a translator for the ECU. The main function of the GIU is to allow communication between the CVT transmission  and the engine control unit.  GIU (gearbox interface unit) The GIU has the following functions:
 
1.Conversion of inputs from the selector lever switches (and steering wheel switches If fitted) into a CAN instruction that is read by the engine control unit.

2.Drive the LED’s to display transmission mode.

3.Conversion of the CAN instruction for the engine control unit into electrical signals to drive the stepper motor, clutch and secondary pressure solenoids
.
The engine control unit( EMS 2000) provides information  for the transmission GIU via a CAN-bus. The ECU controls the position of the stepper motor indirectly by instructing the GIU to control the motor to a given position. You can interrogate the GIU for fault diagnostics and to request real time data and system performance when the vehicle is connected to the DIS/GT1.
Connect your diagnostic Tool and erase all fault codes in the ECU and in the Instrument Cluster. Instrument cluster you think ? in case of a transmission failure  the code is also stored in the instrument cluster. Therefore erase all codes.
Now access Diagnosis functions and component selection as you see at the picture to your right. Now select" service functions" next click on " Drive"  and then select " CVT gear" as you see at your screen. functions

 




Now go to the right below the CVT gear screen and select "replacement/adaptation CVT transmission.
Erase all clutch adaptation and the driving adaptations . If you think you have a control unit problem ,perform the control unit self test in the same time.
If all adaptations erased check your Instrument cluster the shift selector screen switch to 'XP"  as you see....
adaptation

Now you in the "learn mode"
The ‘learn’ mode can be recognized because the LCD gear display will display an ‘X’character in addition to the current drive mode. The ‘X’ stands for fast adaptation - the control system is being adapted to adjust its control to optimizing the performance of the transmission within the particular vehicle. If the transmission or engine control unit is changed, the fast adaptation procedure must be repeated. There are two procedures hat must be completed before the XP on the display is removed.
Clutch Adaptation and Ratio Adaptation


 

 

instrument 
 
Clutch Adaptation

Follow now the Instructions carefully to get a reliable clutch adaptation.
Apply the emergency brakes also keep your food on the brakes and start the cold engine at increased idle speed perform the following:.

From the park position shift to the "N" position for 10 sec. then shift in the "D" position for 10 sec. then shift back to the "P" position.

Repeat the step 10 times !

From the park position shift to the "N" position for 10 sec. then shift to the "R" position for 10 sec. then shift back to the "P" position

Repeat the step 10 times !

Now at the wormer engine and normal Idle speed and still with your feed on the brake perform the following steps :

From the park position shift to the "N" position for 3 sec. then shift in the "D" position for 3 sec. then shift back to the "P" position.

Repeat the step 10 times !

From the park position shift to the "N" position for 3 sec. then shift to the "R" position for 3 sec. then shift back to the "P" position

Repeat the step 10 times !

XP
is still displayed in the instrument panel.
Now you have performed the clutch adaptation and the ratio adaptation or relearning mode can now be performed.


Step-up ratio adaptation

To perform the re-learning process or driving adaptation everybody calls it a different name but it is all the same, drive the car on a level road where nobody batters you and exelarate to about 55 mhs/h
peer hour in D mode, and then lift your food of the throttle. Let the car decelerate do not use any brakes, the adaptation will occur.
If the vehicle speed drops to far before the adaptation process is complete, the engine speed will drop back to Idle and the Instrument cluster will continue to display the "X" character and the transmission will still not operate normally. If this happen, simply repeat the hole process by accelerating back to 55 mhs/h and lift of the throttle again to give the software a chance of learning the remaining points.
When the procedure is complete, the display will return to normal "D"
If the adaptation procedure is complete, the car fine tunes it self, reset the lifetime strategies and the control system works perfect again.

The sat point,
if you have dun everything as I explained to you and the car still wont perform perfectly, analyze exactly what is what the car is doing ?


codes
 

If you  suspect the stepper motor is to be faulty the following procedure you can fallow to test:

Turn the Ignition off for 5 minutes to power the control units down. Unplug the connector from the GIU and using a multi-meter measure phase coils across pin 5 & 6 and then 7 & 8. The reading should be between 18-30 Ohms.

• When a reading cannot be obtained, try reading the phase coils on the transmission connections by probing the connection directly on the transmission.

• When readings can not be obtained at the transmission, the motor is assumed to be faulty.

 

 

 

 

 



 











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