722.6 Transmission Conductor Plate Service

Stephen Owner Florida Posted   Latest   Edited  
Case Study
Drivetrain
Electrical
1997 Mercedes-Benz S320 LWB 3.2L (104.994) 5-spd (722.6) — WDBGA32G1VA361289
P0700 — Transmission Control System (MIL Request),

This is my first posting in Case Studies, so please indulge me. I've encountered many failures of the conductor plate in the Mercedes Benz 722.6xx transmissions that allows A.T.F. to “wick” up the harness and actually flood the T.C.M. with fluid . Apart from Replacing the Conductor Plate, I've found that short of replacing the T.C.M., I simply open the box, remove the circuit board, then hand it to my wife with instructions to put it in the dishwasher with hot water and without using soap. Thirty minutes later, I'm reinserting the board into the box and reinstalling it without the need for re-programming or coding. It's clear that the Module is recoverable once the A.T.F. (which supports small traces of electolysis) is removed. It's worked consistently for me and saves a lot of time. ( Not to mention seven hundred bucks.) I mentioned this to the guys at M.B. Jacksonville and they seemed intrigued. I hope this proves useful to the community at DM.

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Manuel Diagnostician
New Jersey
Manuel
 

Friend it’s best to use ultrasonic machine with distilled water and pcb cleaner not dishwasher you are probably setting customers up for failure in short order. Also small cap bottom right of board is weakest point of atf intrusion iirc. no need to replace conductor plate for this job just replace bushing.

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Michael Technical Support Specialist
California
Michael
 

I would use deionized water. De-ionized water is not electrically conductive. Regular (even distilled) water contains ions and that's what conducts electricity. It's been working so far, so that's good, perhaps using deionized water will keep you batting a thousand.

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Manuel Diagnostician
New Jersey
Manuel
 

distilled water is the way this works but alongside a pcb solution for ultrasonic tanks. We are not powering up components underwater but using the sweep of ultrasonic cleaner to do the work on a microscopic level. distilled only to not leave behind trace minerals. Then alcohol and done.

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Bill Owner/Technician
Michigan
Bill
   

Interesting method , thanks for posting

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Andrew Owner/Technician
Australia
Andrew
   

I don’t think this tip relates to a ZF transmission? If I am not mistaken These transmissions are manufactured by Mercedes.

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Stephen Owner
Florida
Stephen
 

Dear Andrew; I fully agree. I didn't insert the name “ZF”. I don't know who did. I would like to add that this attends only to the 722.6. Also, I'm also a watchmaker and I own an ultra sonic cleaning machine as described by Manuel Marques. We NEVER use ultrasound on electronic watches. The high frequency vibration would damage the components. I agree with Michael Cruz that de-ionized water…

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Thanks