A/T - Shudder On Acceleration From A Standstill
38 Vehicle shudders when accelerating from a standstill38 10 02
2011722/10
June 15, 2010
Supersedes Technical Service Bulletin Group 38 number 09-03 dated August 19, 2009 for reasons listed below.
Affected Vehicles
Condition
Vehicle shudders when accelerating at 10 to 50% throttle from a stationary position, sometimes with fluctuating engine speed.
Technical Background
When closing the forward clutch, the friction value on the clutch plate linings is too high. When the clutch is closed with a high friction value (i.e. the plate linings stick together), the clutch pressure is immediately reduced in connection with the active clutch control to maintain comfort by allowing clutch slip. This control cycle is performed several times and leads to juddering.
Further causes:
^ Poor fuel quality (low octane rating) or engine noise.
^ TCM software update needed.
^ Radial run out of tires.
^ Engine or transmission mounts faulty.
^ Subframe mounts faulty.
^ Worn drive axle joints.
Production Solution
Introduction of 7 clutch plates on all 3.0L MPI.
Service
It is not necessary to receive an authorization number from the Technical Assistance Center for the repairs described in this bulletin.
Note:
If the vehicle is a 2005 Cabriolet 3.0L in the VIN range of 8H_5K013301 through 8H_5K023482, check the repair history of the vehicle to see if RVU IU was performed. If the RVU was not performed, first follow instructions in TSB 2018758 Vehicle shudders when accelerating from a standstill - TCM flash. If the RVU IU was performed, continue with this TSB.
Attach VAS printouts to repair order. Warranty requested documents received without VAS printouts will be denied payment.
Check all systems for faults that may be logged. Address them according to Guided Fault Finding before proceeding.
1. Confirm the concern is not caused by poor quality fuel. With a second technician in the passenger seat with a VAS 5052 monitor, measure value blocks 20 and 21 in the ECM while reproducing the shuddering condition.
^ If any of the fields show numbers of 4 (positive or negative) or more, try a new tank of 91 or higher octane fuel and recheck for the concern.
^ If the concern is gone, it has been caused by poor quality or octane rating fuel. Recommend to the customer the exclusive use of TOP TIER Detergent Gasoline. Reference Technical Service Bulletin 2014753 Gasoline quality in ElsaWeb.
^ If the concern is still present after the fuel has been changed and the ECM MVB 20 and 21 still show numbers of 4 or more, check for excessive engine noise and carbon deposits.
^ If the ECM MVB 20 and 21 read under 4, continue on with the checks in this Technical Service Bulletin.
2. Confirm the engine, transmission and subframe mounts are properly installed and operable.
3. Confirm the radial runout of the wheels and tires is not excessive.
4. Confirm the axles are not worn.
5. Perform the following steps to confirm that the ATF temperature is a minimum of 65°C:
a. In VAS 5051/5052, select Vehicle Self Diagnosis >> 02 - Gearbox electronics >> 08 - Read measuring value block.
b. Input MVB 10 on keypad, select Q to confirm and observe display position 3.
c. ATF must be minimum of 65°C.
6. With the ATF at minimum of 65°C, carefully operate vehicle in an open space (clear of traffic and obstacles) as follows:
a. Accelerate from a stop on a light upgrade with 10 to 30% acceleration displayed in VB 9, position 1.
b. Drive with the hand brake pulled up two notches.
c. After a few yards, the shudder should occur shortly before the clutch engages.
d. After the clutch engages, the shudder goes away.
^ At a constant speed in Tiptronic 4th gear below 2000 RPM, the shudder may occur every 5 seconds due to clutch control.
^ At a constant speed in Tiptronic 3rd gear above 2000 RPM, the shudder should not occur.
7. Stop the vehicle.
a. Ensure that the transmission gear oil is at a minimum of 65�C (MVB 10 position 3).
b. Read MVB 12 and calculate the difference between position 1 and position 2. Save a copy of this MVB.
c. Read MVB 10, position 1. Save a copy of this MVB.
d. If MVB 10, position 1 is above 300 mA (2005 and later model years = 350 mA), replace the transmission.
e. If MVB 10, position 1 is below 220 mA (2005 and later model years - below 250 mA), the ATF cooling system may be plugged.
f. Clean the cooling pipes and thoroughly flush out the ATF components.
g. Replace the external ATF filter. Refer to Group 37, Automatic Transmission - Controls, Housing in the Repair Manual for complete external ATF filter replacement instructions.
If the condition is resolved, no additional work is required.
TCM Software Check and Clutch Diagnosis
1. If the behavior of the vehicle is reproducible as per the Condition, check the repair history in ELSA to see if the transmission has been updated to 7 clutch plates already.
^ If the vehicle has not been updated to 7 clutch plates, continue to Step 2.
^ If the vehicle has been updated to 7 discs, check the table above to ensure the TCM software is at the latest data level.
a. If the data level is lower, load the latest TCM software.
^ Follow all instructions in the attached TSB 2011732 Software Version Management (SVM), operating instructions.
^ For flashing, use update CD 8E0-906-961J and update the gearbox software via Self Diagnosis >> 02-Gearbox- >> Update-Programming.
^ Use vehicle-specific entry to Guided Fault Finding.
^ All fault memories must be interrogated and erased.
^ Select 02 - Multitronic 01J Complaint Report >> Powertrain >> Function >> Bucking When Accelerating From A Standstill. Follow instructions on screen.
b. Ater flashing the TCM, perform an adaptation drive. (On the tester, select Functions/component selection >> drive >> Multitronic 01J front-wheel drive - self-diagnosis systems >> gearbox electronics 01J >> J217 gearbox control unit for Multitronic, functions >> J217 control unit for Multitronic, adjustment.)
2. ATF must be a minimum of 65°C. Check TCM MVB 12. Save a copy of this MVB.
3. Subtract field 2 from field 1. If the value is below 65 mA, or a negative value, and if MVB 10, position 1 is below 300 mA (2005 and later model years - below 350 mA):
^ Replace the 6-plate clutch pack with a new 7-plate clutch pack. Refer to Group 38: Input shaft servicing with 7 lining discs for complete instructions.
^ Parts must be ordered individually. A parts kit is no longer available for the 7-clutch plate application. All necessary parts and tools to complete clutch plate repair are listed in the Required Parts and Tool section of this publication.
4. Following installation of repaired transmission to vehicle, update transmission control module software.
Note:
Failure to update software will cause transmission damage.
If the TCM fails to flash to the Software Version list in the chart above check the disk drive of the scan tool. If the TCM still fails to flash to the correct Software Version contact the Audi Technical Assistance Center for assistance.
Warning:
Observe all workplace and vehicle lift safety guidelines in order to reduce the risk of serious personal injury or death.
Note:
Never operate the vehicle without ATF. Do not exceed 35 mph while operating the vehicle on the lift.
5. If the clutch plates are replaced, flush the ATF by performing the following steps:
a. Drive the vehicle onto a lift and ensure that the vehicle is secure to the lift.
b. Raise the vehicle until all 4 wheels are approximately 8 inches off the ground. Ensure that all 4 wheels rotate freely.
c. In Tiptronic mode, shift from first to top gear and accelerate moderately after each shift.
d. Shift the transmission back down into first gear.
e. Carefully apply the brake pedal in order to stop the wheels from rotating.
f. With the brake pedal firmly applied, shift the transmission into R.
g. Release the brake pedal and moderately accelerate to approximately 12 mph.
h. Carefully apply the brake pedal in order to stop the wheels from rotating.
i. Return the gear lever to D and repeat steps 3 through 8 five times.
j. Place the gearshift lever into P and turn the engine off.
k. Change the ATF according to the instructions in Group 37, Automatic Transmission Controls, Housing in the Repair Manual.
l. Repeat steps c - k a second time.
6. Now adapt the Transmission Control Module (TCM):
a. Confirm that the ATF is at a minimum 65°C. (MVB 10 position 3).
b. With the ATF at a minimum 65°C, carefully operate the vehicle in an open space (clear of traffic and obstacles).
c. Shift vehicle into D.
d. Drive forward at part load approximately 10 meters (33 feet), then apply brake pedal to a stop and continue to apply brake pedal for approximately 10 seconds.
e. Shift vehicle into R.
f. Release brake pedal.
g. Drive backwards at part load approximately 10 meters (33 feet), then apply brake pedal to a stop and continue to apply brake pedal for approximately 10 seconds.
h. Repeat steps a - g (alternating between D and R) five times.
i. Completed adaptions can be viewed in MVB 10 and 11, position 2.
Warranty
Required Parts and Tools
Additional Information
More information on this system can be found in the following resources:
^ TSB 2011732 00 Software Version Management (SVM), operating instructions.
The following repair procedures will be necessary to complete this procedure:
^ Change ATF: Group 37, Automatic Transmission Controls, Housing in the Repair Manual
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.
Attachment - TSB 2011732 00 Software Version Management (SVM), operating instructions.