722.9 Transmission problems? - Mercedes-Benz Forum
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post #1 of 106 (permalink) Old 09-18-2011, 12:54 AM Thread Starter
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722.9 Transmission problems?

Here is the official view from MB, thanks to noodles. It makes very good reading.

Date: April 8, 2011

Order No.: S-B-27.00/120

Group: 27

SUBJECT: All Models Equipped with 722.9 NAG2 (7G-Tronic) Transmission

All Warrantable Model Years

Diagnostic Verification for Valve Body/Conductor Plate Replacement Required for Warranty Replacement Only

Mercedes-Benz USA, LLC will begin Diagnostic Verification for 722.9 NAG2 Transmission Valve Body/Conductor Plate replacements starting on Monday, April 18, 2011. MBUSA has posted a Diagnostic Verification form for transmission replacements which can be found on: NetStar -> Service -> STAR TekInfo -> Diagnostic Verification Proj. -> NAG2 Valve Body/Conductor Plate

Under this program, replacement of the Model Year 2004 through present Model Year 722.9 (NAG2) Transmission Valve Body/Conductor Plate will require verification that a replacement is necessary prior to replacement in accordance with the program terms summarized below.
^ The technician shall conduct an accurate assessment and complete documentation of the problem by submitting a Diagnostic verification request through NetStar -> Service -> STAR TekInfo -> Diagnostic Verification Proj. -> NAG2 Valve Body/Conductor Plate.

^ Upon completion of the form, click on the "submit" button to send the form to Dealer Technical Support(DTS). A Diagnostic Verification case number will be displayed upon submission. Supporting documentation (e.g. Short Test, Control Unit Log, Freeze Frame Data & pictures of damaged parts where appropriate) must then be sent to [email protected] with the case number in the subject line as a reference. Once the form and supporting documentation are received, the case will be reviewed. After review, you will be notified via e-mail (to the address listed on the form) if the diagnosis is verified. Warranty Services Group will also be updated when the diagnosis is verified.

^ Once a diagnosis is verified, the replacement part will be released by Special Procurement automatically. Replacement can then be performed and a warranty claim submitted. When the claimed part is submitted, the claims processing system will validate that verification has been obtained. Failure to submit the required paperwork with the claim will result in automatic debiting. Returning a claimed part without a Diagnostic Verification will result in automatic debiting of the claim.

^ If the QEC inspection does not confirm the diagnosis as stated in the Diagnostic Verification case, the claim is subject to debit.

Please refer to the Electronic Parts Catalog (EPC) to specify parts accordingly and refer to Paragon to check availability of the specified parts. If you have any questions with specification or availability, contact the PAC.
Quote:
Date: June 14, 2010

Order No: S-B-27.19/118A

Supercedes: S-B-27.19/118, April 29, 2010

Group: 27

Revision History

Revision Date Purpose

a 6/14/10 Procedure 2-3 ordering notes modified

SUBJECT:
MY-All, Transmission 722.9 in Models 164, 171, 203, 204, 207, 209, 211, 212, 215, 216, 219, 220, 221, 230, 251, 463

Ordering Notes for Electrohydraulic Control Unit

The following information clarifies how to determine the correct electrohydraulic control units.



A. Procedure 1a

1. Diagnosis on the vehicle is possible:

2. To determine the correct EHS part number, the currently installed EHS should first be read out with the Star diagnosis.

a. Xentry Diagnostics:
^ via the path "Control units view" - "Current quick test" - "Fully integrated transmission control" - "EHS part number".

^ Ordering the new EHS with this read out part number.

b. DAS:
^ "Quick test">"EGS > electronic transmission control serial number".

^ Ordering the new EHS with this read out serial number.

B. Procedure 1b

Diagnosis on the vehicle is no longer possible, as the control unit no longer responds. Therefore, the number must be read off directly by the EHS and the ordering process is started with this number.

C. Procedure 2

1. Read out part number A 220 270 14 06

2. This part number was replaced by A 220 270 13 06 or by A 220 270 18 06, depending on the vehicle model range.

For this the following must be observed for correct ordering:

Model 209, 211, 215, 219, 220, 230 with transmission 722.901

A 220 270 14 06 replaced by

A 220 270 18 06 replaced by

A 220 270 31 06

Model 209 with transmission 722.902 and engine 642.910 up to 5/31/2007
^ A220 270 14 06 replaced by

^ A 220 270 21 06 replaced by

^ A220 270 29 06

Model 209 with transmission 722.902 and engine 642.910 as of 6/1/2007

A 220 270 14 06 replaced by

A220 270 19 06 replaced by

A220 270 32 06

Model 164, 251 with transmission 722.901

A 220 270 14 06 replaced by

A 220 270 13 06 replaced by

A 220 270 27 06

Model 164, 203 with transmission 722.902

A 220 270 14 06 replaced by

A 220 270 13 06 replaced by

A 220 270 27 06

Model 171, 209, 211, 219 and 230.471 with transmission 722.904

A 220 270 14 06 replaced by

A 220 270 13 06 replaced by

A 220 270 27 06

Model 221 with transmission 722.906

A 220 270 14 06 replaced by

A 220 270 13 06 replaced by

A 220 270 27 06

Model 171 with transmission 722.907

A 220 270 14 06 replaced by

A 220 270 13 06 replaced by

A 220 270 27 06

D. Procedure 3

1. Read out the part number A 220 270 12 06

2. For this the following must be observed for correct ordering:
^ Model 219.356, 171.456 with transmission 722.906 up to and including model year 2005 (code 805)

A 220 270 12 06.
^ For all other baumusters/model designations (except 219.356, 171.456) order with the read off part number A 220 270 12 06

A 220 270 12 06 replaced by

A 220 270 18 06 replaced by

A 220 270 31 06
Quote:
Hard 1-2 shift or hard torque converter lockup clutch engagement

Topic number LI27.00-P-049253

Version 1

Design group 27.00 General

Date 04-06-2010

Validity Transmission 722.9

Reason for change Remedy revised / Supersedes DTB S-B-27.00/112

Reason for block

Complaint:

The customer complaint of "Hard shift, presumable the 1-2 shift, occurs when moving off" is often received even though the problem is hard engagement of the torque converter lockup clutch (KUB) in the start-off process.

In order to permit a clear diagnosis, restrict the transmission to 1st gear by shifting to position 1.

If a jolt occurs at the point where the state of the torque converter lockup clutch changes from "open" to "slipping", then the cause should be sought in the control of the torque converter lockup clutch.

Cause:

Control of torque converter lockup clutch engagement not optimized.

Remedy:

1. Via DAS menu item "Initial startup", perform transmission software update and then perform SCN coding.

2. Via DAS menu item "KUB adaptation", adapt the torque converter lockup clutch according to the coolant temperature and torque window.

3. Then perform a test drive.


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post #2 of 106 (permalink) Old 10-01-2011, 09:58 AM
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I have a 2007 S550 4matic, and my car is making a loud friction noise from under the car.
I had my car diagnosed and I found out that the Transfer Case bearing is bad. Does anybody knows if I can change the bearing or I have to change the transmission?
my car has only 70000 miles.
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post #3 of 106 (permalink) Old 10-01-2011, 10:15 AM Thread Starter
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Quote:
Originally Posted by mrares View Post
I have a 2007 S550 4matic, and my car is making a loud friction noise from under the car.
I had my car diagnosed and I found out that the Transfer Case bearing is bad. Does anybody knows if I can change the bearing or I have to change the transmission?
my car has only 70000 miles.
As far as I know you cannot buy parts for the transfer case, you will have to change the transfer case but not the whole transmission. If you PM me your vin # I will check further.


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post #4 of 106 (permalink) Old 10-01-2011, 10:49 AM
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thank you for your fast replay. the transfer case is part of the transmission in S550 model.
I don't know if I can change only the Transfer case.
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post #5 of 106 (permalink) Old 10-01-2011, 11:08 AM Thread Starter
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Quote:
Originally Posted by mrares View Post
thank you for your fast replay. the transfer case is part of the transmission in S550 model.
I don't know if I can change only the Transfer case.
I think you can do better than that, speak to the parts people;
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post #6 of 106 (permalink) Old 10-01-2011, 11:13 AM
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That is a great news. Thank you.
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post #7 of 106 (permalink) Old 10-01-2011, 08:21 PM
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do you have the diagram for the transfer case for the 2007 s550 4matic option?
the bad bearing is the one for the front wheel drive shaft.

Last edited by eric242340; 10-02-2011 at 04:03 AM.
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post #8 of 106 (permalink) Old 10-02-2011, 01:39 AM Thread Starter
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Quote:
Originally Posted by mrares View Post
do you have the diagram for the transfer case for the 2007 s550 4matic option?
the bad bearing is the one for the front wheel drive shaft.
I will need your vin # to be accurate of this, pm it to me if you do not want it to be seen.


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post #9 of 106 (permalink) Old 10-02-2011, 04:05 AM Thread Starter
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Quote:
Originally Posted by mrares View Post
do you have the diagram for the transfer case for the 2007 s550 4matic option?
the bad bearing is the one for the front wheel drive shaft.
The pic I posted was for the transfer case bearing and here is the front diff bearings. Also known as the final drive transfer case, so which is it you are looking for??
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Last edited by eric242340; 10-02-2011 at 04:07 AM.
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post #10 of 106 (permalink) Old 10-02-2011, 07:58 AM
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Thank you for your help. Do you have transfer case diagram for the AWD version?
The last one that you poster is the differential from the front wheel drive. The bad bearing is on the Transfer Case at the end of the transmission.
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