CVT - Transmission Shudders On Acceleration
37 Transmission shudders on acceleration
24 12 38
2022600/3
August 24, 2012.
Supersedes Technical DIAGNOSIS AND REPAIR Group 24 number 10 - 57 dated
December 13, 2010 for reasons listed below.
Affected Vehicles
Audi A4 Quattro Sedan (8K2) L4-2.0L Turbo (CAEB) Page 41
Condition
^ Vehicle shudders when pulling away. The vehicle pulls away from a stop with a delay and a shudder.
^ Shuddering on acceleration from under 15 mph.
^ The complaint can be reproduced, but no fault can be found.
Technical Background
ECM and TCM software calibration.
Production Solution
Optimized ECM and TCM software.
Service
Check and, if needed, update the engine software and the transmission software via SVM.
Perform a Clutch adaptation via Guided Fault Finding
1. Follow all instructions in the attached TSB 2011732 00 Software Version Management (SVM), operating instructions.
2. Update the ECM (J623) using the SVM action code as listed in the table above if necessary.
3. Update the TCM (J217) using the SVM action code as listed in the table above if necessary.
4. After updating the ECM and/or the TCM, the programmed values of the clutches must be reset as follows:
a. In Guided Functions, select Transmission Electronics >> Adjustment.
After starting this function, the following question appears: "Have you replaced the control unit for the automatic gearbox?"
b. Answer Yes.
Now the fault entry can be deleted and the adaptation of the clutches can be performed.
5. Attempt the GFF clutch adaptation test plan. If the test plan fails to adapt the clutches, perform the 0AW Self-Diagnosis Clutch Adaptation
Instructions below.
Audi A4 Quattro Sedan (8K2) L4-2.0L Turbo (CAEB) Page 42
0AW Self-Diagnosis Clutch Adaptation Instructions
Select the following measured values in the self-diagnosis and possibly save them under Favorites:
^ Adaptation of the forwards start-up behavior [LO] State
^ Adaptation of the backwards start-up behavior [LO] State
^ Transmission fluid temperature
^ Specified clutch torque
Creep adaptation of the forward and reverse clutch with 0AW gearboxes:
1. Make sure that there are no fault entries in the TCM.
2. Warm up the gearbox to about 85锟斤拷C, ideally by pulling away in driving mode D and R at various loads of max. 1500 rpm.
Tip: Currently the adaptation is possible only when the measured value transmission temperature is between 80锟斤拷 - 95锟斤拷C.
3. When the vehicle is standing still, select driving mode D.
4. Pull away with little acceleration to about 6 mph or 10 km/h. Slowly brake the vehicle with the foot brake. Hold the brake pedal for another
5-10 seconds as the vehicle stands still.
5. When stopping, the specified clutch torque must not drop below 20 Nm, otherwise the adaptation fails. If this is the case, change the driving
profile (less load, gentler braking).
6. Repeat step 4 until the measured value indicates the adaptation of the forwards start-up behavior is successfully completed.
7. With the vehicle standing still, select driving mode R.
8. Repeat step 4 until the measured value indicates adaptation of the backwards start-up behavior is successfully completed.
When stopping, the specified clutch torque must not drop below 20 Nm, otherwise the adaptation fails.
If this is the case, change the driving profile.
9. After a terminal 15 reset, the adaptation starts over again with status running. Keep the ignition switched on for at least six minutes after a
successful adaptation.
Tip: The ignition must not be switched off during this time period.
Audi A4 Quattro Sedan (8K2) L4-2.0L Turbo (CAEB) Page 43
Warranty
Required Parts and Tools
VAS 5052, VAS 5052A, or VAS 5051B
Additional Information
The following Technical DIAGNOSIS AND REPAIR will be necessary to complete this procedure:
^ TSB 2011732 00 Software Version Management (SVM), operating instructions.
All part and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Dept. and service manuals
for the latest information.
Attachment
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Audi A4 Quattro Sedan (8K2) L4-2.0L Turbo (CAEB) Page 45
Audi A4 Quattro Sedan (8K2) L4-2.0L Turbo (CAEB) Page 46
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Audi A4 Quattro Sedan (8K2) L4-2.0L Turbo (CAEB) Page 48
Audi A4 Quattro Sedan (8K2) L4-2.0L Turbo (CAEB) Page 49
Audi A4 Quattro Sedan (8K2) L4-2.0L Turbo (CAEB) Page 50
Audi A4 Quattro Sedan (8K2) L4-2.0L Turbo (CAEB) Page 51
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Audi A4 Quattro Sedan (8K2) L4-2.0L Turbo (CAEB) Page 53
TSB 2011732 00 Software Version Management (SVM), operating instructions.
