NHTSA ID Number: 10135961
Manufacturer Communication Number: LI27.20-P-055758
TSB/Document Date: 2018-05-07
Summary
Friction power of torque converter lockup clutch is too high (FC 2783) or actuation of torque converter lockup clutch not possible (FC 0741)
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
4
Design group
27.20 Torque converter
Date
05-05-2014
Validity
Vehicles with NAG2FE+ (7G-TRONIC PLUS)
Reason for change
Cause and remedy adapted.
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 NAT2FE+ (7G-TRONIC PLUS) vehicles as of production month 04/2011. The two fault codes can
also occur in combination with rpm sensor faults (see also LI27.50-P-049710). 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 with ID higher than 03.979.899 or 07.247.699
Possible small internal leakage at sealing ring between transmission input shaft and torque converter lockup clutch.
Attachments
File
Designation
M271 – NAG2FE+ Getriebesoftware_transmission softwa- M271 - NAT2FE+ Getriebesoftware_transmission software.pdf
re
Remedy:
Remedy 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
Vehicles with M271 and transmission software (see attachment):
If the installed transmission software is one of the versions listed in the attachment ("M271 - NAG2FE+
Getriebesoftware_transmission software"), an update of the transmission software must be performed. Erase the fault
codes in the VGS and reset the lifecycle data of the torque converter (see below for instructions).
If none of the transmission software versions in the list is installed, proceed as described under "Vehicles without
M271".
Vehicles without M271:
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 once 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.
05-05-2014 2:39 PM
© Copyright Daimler AG
PARKEGL
Page 1/4
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 A 000 989 80 51 10 before installation.
Remedy for TRANSMISSION 722.9 with ID higher than 03.979.899 or 07.247.699
Follow the description for "Vehicles without M271".
After replacing the torque converter for any reason, the lifecycle data of the torque converter must be reset as follows:
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
Attachments
File
Designation
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
Parts
Part number
ES1 ES2 Designation
A 000 986 92 74
Quantity Note
15 µm microfinishing film/polish
1
EPC Other
make
part
Packing unit corresponds to 1.
5 m (pack contains 5 strips of
0.30 m) -> Use strips once only.
X
Work units
Op. no.
Operation text
05-05-2014 2:39 PM
© Copyright Daimler AG
Time
PARKEGL
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
Page 2/4
27287 **
For use on TRANSMISSION 722.
9 with ID higher than 03.979.899 or
07.247.699
Validity
Vehicle
Engine
204.082
651
722.965
204.282
651
722.965
207.302
651
722.908
207.303
651
722.908
207.323
642
722.903
207.402
651
722.908
207.403
651
722.908
207.423
642
722.903
212.002
651
722.908
212.003
651
722.908
212.005
651
722.996
212.021
642
722.903
212.023
642
722.903
212.082
651
722.965
212.093
642.858
722.966
212.097
651
722.965
212.202
651
722.908
212.203
651
722.908
212.205
651
722.996
212.221
642
722.903
212.223
642
722.903
212.282
651
722.965
212.293
642.858
722.966
218.303
651
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TSB/Document ID: LI27.20-P-055758
Replacement Service Bulletin Number:
MFR Communication Date: 2014-05-05
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
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