LI27.00-P-051451

Shift quality complaints on TRANSMISSION
722.9 (7G-TRONIC and 7G-TRONIC PLUS)
Topic number
LI27.00-P-051451
Version
5
Design group
27.00 General
Date
07-14-2014
Validity
All MODELS with TRANSMISSION 722.9 (NAT2/NAT2i)
Reason for change
Diagnostic tree adjusted
Reason for block
Complaint:
Shift quality complaints can occur while driving.
Cause:
Various.
Remedy:
If shift quality complaints occur, it is essential to read out the transmission control unit log as well as the EEPROM data, i.e. the log file (*.log), before beginning repair work and before adaptation of the most recent quick test. The EEPROM data must be stored separately on a data medium (USB stick) as it can no longer be reproduced after adaptation has been performed.
Additional information on adaptation and on reading out EEPROM data can be found in STARTekInfo
As a preparatory measure, verify the problem gearshift in the presence of the customer by using Star Diagnosis to
check the actual values of the engaged gears. To diagnose and correct the specific problem, it is necessary to work
through "Fault tree NAG2" contained in the attachment.
Note: Adaptation guidelines provided as attachment.
Note: The latest version of the Star Diagnosis (including all available add-ons) must be used for programming the
transmission and engine control unit. Only then can it be ensured that the very latest version of each software is installed.
Before creating a PTSS case, it is essential to check that both the engine control unit and the transmission control unit
have the latest software release, to update the software if necessary and to perform another test drive.
Attachments
File
Description
EEPROM Bloecke f_r VGS3 mit DAS auslesen en.pdf
Read out EEPROM blocks for VGS3 using DAS, English
EEPROM Bloecke f_r VGS3 mit Xentry auslesen en.pdf
Read out EEPROM blocks for VGS3 using Xentry, English
Fault tree shift quality NAG2_NAG2i mbusa.pdf
Fault Tree NAG2
07-14-2014 7:14 PM
© Copyright Daimler AG
PARKEGL
Page 1/2
Symptoms
Power transmission / Automatic transmission / Automatic transmission - function / Limp-home mode
Power transmission / Automatic transmission / Automatic transmission - function / General
Power transmission / Automatic transmission / Automatic transmission - function / Engaging process
Power transmission / Automatic transmission / Automatic transmission - function / No power flow
Power transmission / Automatic transmission / Automatic transmission - function / Shifts
Power transmission / Automatic transmission / Automatic transmission - function / Slips
Power transmission / Automatic transmission / Automatic transmission - function / Shifting is not performed or is delayed
Power transmission / Automatic transmission / Automatic transmission - function / Poor shift quality
Validity
Vehicle
Engine
Transmission
*
*
722.998
*
*
722.996
*
*
722.963
*
*
722.903
*
*
722.904
*
*
722.932
*
*
722.962
*
*
722.908
*
*
722.961
*
*
722.999
*
*
722.931
*
*
722.960
*
*
722.909
*
*
722.967
*
*
722.965
*
*
722.906
*
*
722.950
*
*
722.997
*
*
722.930
*
*
722.902
*
*
722.966
*
*
722.964
*
*
722.901
*
*
722.907
07-14-2014 7:14 PM
© Copyright Daimler AG
PARKEGL
Page 2/2