LI27.20-P-055758

Friction power of torque converter lockup clutch is too high (FC 2783)
or actuation of torque converter lockup clutch not possible (FC 0741)
Topic number
LI27.20-P-055758
Version
10
Design group
27.20 Torque converter
Date
04-07-2015
Validity
Vehicles with TRANSMISSION 722.9 (7G-TRONIC
PLUS) from production months 04/2011 to 12/2013
Reason for change
Added Fault codes to validity
Reason for block
Complaint:
FC 2783 (Friction power of torque converter lockup clutch is too high) or FC 0741 (Actuation of torque converter
lockup clutch not possible) stored in transmission control unit. One possible additional customer complaint could be
"poor acceleration" e.g. due to engine intervention.
This can affect all 722.9 transmissions (7G-TRONIC PLUS) from the production months 04/2011 to 12/2013. The two
fault codes can also occur in combination with rpm sensor faults (see also the relevant GI or LI). The rpm sensor fault
is not connected with this complaint.
Cause:
Cause for TRANSMISSION 722.9 from ID 03.318.709 to ID 03.979.899 or from ID 07.019.944 to ID 07.247.699
Increased wear of torque converter bearing bushing. The cause of this may be a rough microsurface of the journal at
the transmission end.
Cause for TRANSMISSION 722.9 from ID 03.979.899 to ID 03.999.999, from ID 05.000.001 to ID 05.392.283, from ID
07.247.699 to 07.716.823 or from ID 10.000.001 to 10.083.989
Possible slight internal leakage at sealing ring between transmission input shaft and torque converter lockup clutch.
Remedy:
Remedy for vehicles with ENGINE 271
Update transmission software. Erase the fault codes in the VGS and reset the lifecycle data of the torque converter
(see below for instructions).
If no newer transmission software is available, proceed as described under "Remedy for vehicles without ENGINE
271".
Remedy for vehicles without ENGINE 271
Disassemble the transmission and the torque converter and then sand the transmission input shaft with a 15 µm microfinishing film as described in the attached instructions (use the finishing film/strip 1x only). The finishing film/polishing strip can be ordered as a consumable from the GLC.
The torque converter must also be replaced here (please order as per EPC).
Observe the following (the flex plate must be installed):
1.) Clean torque converter mount in crankshaft using brake cleaner.
2.) Remove fretting rust from torque converter mount in crankshaft using suitable emery cloth (grain size: 120).
3.) Again clean torque converter mount in crankshaft using brake cleaner (compressed air if necessary).
4.) Grease mounting pin of torque converter with multi-purpose paste before installation.
Additional note (valid for all repair methods described here which instruct replacement of the torque converter)
After replacing the torque converter, the lifecycle data of the torque converter must be reset as follows:
04-07-2015 9:40 PM
© Copyright Daimler AG
PARKEGL
Page 1/4
Access via XENTRY: VGS - Fully integrated transmission control (Y3/8n4) -> Teach-in processes -> Reset of adaptation values -> Torque converter -> Confirm torque converter replacement with Yes -> Confirm reset of adaptation data
with Yes
Access via DAS: Electronic transmission control (722.9 7G-TRONIC) -> Transmission adaptation -> Reset of adaptation data (torque converter lockup clutch) -> Confirm torque converter replacement with Yes -> Confirm reset of adaptation data with Yes
If vehicles with TRANSMISSION 722.9 and ID after 05.392.283, after 07.716.823 or after 10.083.989 are reported
with this complaint, please create a TIPS case.
Attachments
File
Description
Working instruction finishing the turbine shaft_en..pdf
Working instruction finishing turbine shaft
Beispielbilder_example pictures.pdf
Beispielbilder "Passungsrost innerhalb der Drehmomentwandler-Aufnahme der Kurbelwelle"
Example pictures "Fretting corrosion within the torque
converter seat of the crankshaft"
Symptoms
Power transmission / Automatic transmission / Automatic transmission - function / General
Power transmission / Automatic transmission / Automatic transmission - function / Poor start-off performance
Power transmission / Automatic transmission / Automatic transmission - function / Shifts
Power generation / Engine management / Engine performance / No/poor output
Power generation / Engine management / Engine performance / Poor acceleration
Power transmission / Automatic transmission / Automatic transmission - function / Poor shift quality
Control unit/fault code
Control unit
Fault code
Fault text
VGS - Fully integrated transmission control (Y3/8n4)
(VGS4NAG2) (C (205),GLK
(204),S (222),C (204),M/GLE
(166),GL/GLS (166),E (212),
SL (231),CLS (218),S (217),E
(207),G (463))
P074100
The wet clutch/torque converter lockup clutch does not close. _
VGS - Fully integrated transmission control (Y3/8n4)
(VGS4NAG2) (C (205),GLK
(204),S (222),C (204),M/GLE
(166),GL/GLS (166),E (212),
SL (231),CLS (218),S (217),E
(207),G (463))
P278300
The friction power of the torque converter lockup clutch is too
high.
Parts
Part number
ES1 ES2 Designation
A 000 986 92 74
04-07-2015 9:40 PM
© Copyright Daimler AG
Quantity Note
15 µm microfinishing film/polish
1
PARKEGL
Packing unit corresponds to 1.5 m
(pack contains 5 strips of 0.30 m) ->
Use strips once only
EPC
X
Page 2/4
A 000 989 80 51
12
Multi-purpose paste
1
Pack contains 100g
X
Work units
Op. no.
Operation text
Time
Damage
code
Note
27161 04
For use on TRANSMISSION 722.9
from ID 03.318.709 to ID 03.979.899
or from ID 07.019. 944 to ID 07.247.
699
27287 **
For use on TRANSMISSION 722.
9 with ID higher than 03.979.899 or
07.247.699
Validity
Vehicle
Engine
Transmission
*
*
722.966
*
*
722.903
*
*
722.969
*
*
722.993
*
*
722.909
*
*
722.950
*
*
722.995
*
*
722.905
*
*
722.967
*
*
722.907
*
*
722.961
*
*
722.971
*
*
722.908
*
*
722.968
*
*
722.999
*
*
722.931
*
*
722.998
*
*
722.902
*
*
722.962
*
*
722.930
*
*
722.901
*
*
722.996
*
*
722.965
*
*
722.997
*
*
722.963
*
*
722.932
*
*
722.906
04-07-2015 9:40 PM
© Copyright Daimler AG
PARKEGL
Page 3/4
*
*
722.964
*
*
722.960
*
*
722.904
04-07-2015 9:40 PM
© Copyright Daimler AG
PARKEGL
Page 4/4