A/T Controls - Grunting Noise On 6-3 Downshift
37 Noises when changing from 6th to 3rd gear37 09 15
2018789/2
November 4, 2009.
Supersedes Technical Service Bulletin Group 37 number 08-15 dated
Affected Vehicles
Condition
Grunting noise while downshifting from 6th to 3rd gear on hard acceleration.
This noise is usually noticed when changing down from 6th to 3rd but can also be noticed on a 5th to 4th downshift.
The noise is sporadic, as it depends on factors such as engine speed, vehicle speed and load.
Technical Background
Grunting noise when changing down from 6th to 3rd or 5th to 4th due to manufacturing tolerances in clutch A and B.
This condition does not affect vehicle control.
Production Solution
Optimized software to improve gear changing.
Service
1. Try to reproduce the customer complaint so that it can be clearly assigned to this TSB.
As the concern is sporadic, try to obtain from the customer at what temperature the concern occurs. Try to duplicate the conditions.
If the concern has been duplicated, perform the following checks.
2. Check the ATF level according to the repair manual.
Note:
Using the wrong ATF may cause transmission malfunctions or failure. Only use the ATF available as a replacement part for the planetary gearing in automatic transmission 09E.
Tip: Various types of ATF are available for this transmission. These are allocated to the transmission code letters and/or the transmission number in ETKA, the electronic parts catalog.
3. Check the Transmission Control Unit software part number and Software Version per the SVM table below.
4. If the Software Version is lower then the new version listed in the SVM table, perform the SVM update.
SVM Update Instructions
1. Follow all instructions in the attached TSB 2011732 Software Version Management (SVM), operating
instructions.
2. Update the Transmission Control Unit (J217) using SVM action code as listed in the table below if necessary.
3. Perform an adaptation drive to ensure shift quality. The adaptation drive is necessary because the software update deletes all the adaptation values of the shift elements in the transmission control unit. The adaptation drive must be performed in GFF or Guided Functions.
The GFF Adaptation Drive test plan is located in Function / Component Selection >> Powertrain >> Automatic transmission 09E >> 01-On Board Diagnostics >> 02- Transmission Electronics 09E >> J217- TCM functions >> J217- TCM adaptation drive.
Warranty
Additional Information
The following Technical Service Bulletin will be necessary to complete this procedure:
^ TSB 2011732 00 Software Version Management (SVM), operating instructions.
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.
Attachments - 00 Software Version Management (SVM), operating instructions