722.6 13-pin connector - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 02-12-2012, 12:40 PM Thread Starter
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722.6 13-pin connector

I read the following on the 722.6:
The majority of leaks come from the 13 Pin Electrical connector and the shifter mechanism below. The 13-Pin connector can leak either internally or externally. In some, the leak will even wick up the harness to the ETC (Electronic Control Module) causing the Module to short out as well. Mercedes has an updated connector now available for this condition.

Since I will be doing the ATF partial flush and since my w209 is high-mileage (150K miles), should I change this connector as well? Or if it is working, don't touch it? Is this connector easy to change?
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post #2 of 8 (permalink) Old 02-12-2012, 01:41 PM
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Are you removing the pan to change the filter during your ATF flush? If so the connector to the ETC is easy to access.

The SI in the WIS advises: "When repairs are performed on automatic transmission 722.6, the pilot bushing A203 540 00 53 and its O ring must be replaced to avoid any further visits to the workshop."

It also states: "After the pilot bushing is replaced, the new bushing should be marked with a green dot on the white ring so that is not changed again. Pilot bushings with a green dot are only to be replaced if they leak".

So, when you get access to the connector, check for a green dot, as it may have been changed already by a previous owner. However, if it looks original, you should change it while you are there, as it is relatively cheap.
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post #3 of 8 (permalink) Old 02-12-2012, 02:06 PM Thread Starter
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I bought the car new on Jan-2004. My car has been well serviced exclusively in the dealership. I asked for a partial flush of the ATF on Feb-2009. I checked the invoice and in addition to the filter and fluid. they also changed the following items:
1 140-271-00-80 Oil pan gasket
2. 140-271-00-60 Seal ring (plug washer)
3. 140-991-00-55 Break pin

I am not clear on the part name. Is the seal ring the O ring? What is this pilot bushing? How about the 13-pin connector?
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post #4 of 8 (permalink) Old 02-12-2012, 03:14 PM
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yes - it needs clarifying.

The fixed connector (item #11) is shown in the drawing of the transmission. It is surrounded by ATF so must not leak much (but some ATF might pass via the pins). That does not get changed.

At the free (plug) end of the loom to the ETC module is the connector that contains what MB call a pilot bushing. This is 'oil-proof' and is held in place with a centre screw. This is the part which can be replaced by the improved design, as shown in the drawing below.
Attached Files
File Type: pdf AT 722.6 elect component layout.pdf (187.7 KB, 590 views)
File Type: pdf AT pilot bushing.pdf (137.8 KB, 546 views)
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post #5 of 8 (permalink) Old 02-12-2012, 03:28 PM
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Just re-read your post.

The parts that were previously changed have nothing to do with the pilot bushing. They are all associated with changing the ATF. The plug washer is on the pan drain plug.

Surprising that they dropped the pan (changed the gasket) but did not change the filter. If that was not done then, you should do it this time.

Out of interest, how much ATF was put in during the 'partial flush'?
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post #6 of 8 (permalink) Old 02-12-2012, 04:05 PM Thread Starter
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My mistake. They also charged me the following:
Filter 140-277-00-95
5 liter of ATF 001-989-21-03-10

i posted my hesitant in the other post. To make a long sotry short, since the old ATF is no longer available locally, I will use the new fluid, 001-989-68-03-13. In order to push in more new fluid, I will do 2 partial flushes; the 2nd one on the next day.
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post #7 of 8 (permalink) Old 02-13-2012, 08:21 AM
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Yep - if you drain 3 liters old ATF, and add 3 liters new ATF you will have 67% old, 33% new - assuming 9 liters total.

If you repeat the exercise you will have 45% old, 55% new. (approx)
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post #8 of 8 (permalink) Old 02-13-2012, 08:48 AM Thread Starter
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Quote:
Originally Posted by keyhole View Post
Yep - if you drain 3 liters old ATF, and add 3 liters new ATF you will have 67% old, 33% new - assuming 9 liters total.
If you repeat the exercise you will have 45% old, 55% new. (approx)
The 2 pan flushes will be done this week, probably Tuesday and Thursday.

I just hope that the 2 ATF fluids will work together !!!

Last edited by mis3; 02-13-2012 at 08:53 AM.
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