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  #1  
Old 01-19-2020, 09:30 PM
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Bent pins on the trans valve body

So while doing service work on my 2005 4.8is transmission somehow I bent two of the pins reinstalling the harness through the mechatronic bulkhead in the trans. As I expected the pins snapped off due to fatigue when I gently tried to bend them back. Just how bad is this repair going to be? I can obviously separate the electronics from the mechanicals on the valve body but can I simply swap this unit with another 6hp26 unit or do I require something special being an X5 4.8is?
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Old 01-20-2020, 12:18 AM
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Alignment sleeve concept or what ? Picture will do wonders.
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Old 01-20-2020, 03:40 AM
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The forum isnít allowing me to load few pics of the valve body connection. This is the one and only electrical input into the trans. Iím not new to working on vehicles but this would be my first E53 valve body so Iím trying to understand just how much of a pain in the butt a replacement will wind up being. I can separate the electronic portion of a used valve body and put it on my mechanical valve assembly so that I know the history of the mechanical portion and Iím not dealing with a mystery one from eBay. However, Iím still not sure if any 6hp26x valve body would work and whether or not it needs some level of coding to my specific vehicle. Adaptations would be reset regardless
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Old 01-20-2020, 05:36 AM
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Are you talking about the pins on this round black connector here...?



I've not seen it as a seperate part, other than in tear-down images....



If this is the part that is damaged, I don't think it contain any smart "electronics" - just connections to the solenoids and a few speed sensors and the gear position switch. The adaptations etc. are stored in the EGS in the e-box, not in the transmission itself. *edit* - turns out I'm wrong about this!

If you can locate a replacement it should be a straight swap. There appears to be a few variations on this part, due to variuos versions of 6HP26 - sensors in differing locations etc.
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Last edited by wpoll; 01-20-2020 at 06:35 AM.
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Old 01-20-2020, 05:56 AM
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Further searching has turned up a document (from Sonnax) which includes some images that make me think there *might* be more to the 6HP26 mechatronic wiring block than I originally thought.



There's a sealed unit in the middle of this sucker that seems "integrated" and is perhaps the reason for all the anti-static warnings that seem common on 6HP26 instuctions...

Still not sure if this is the part that is damaged but swapping it out might be complex that I first thought..

*edit* Studying the wiring diagrams - there is CANbus data directly connected to the TCM in the transmission - so there is definitely a serious amount of control electronics in there. I guess I've been reading too much stuff on the earlier ZF transmissions...
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Last edited by wpoll; 01-20-2020 at 06:34 AM.
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Old 01-20-2020, 06:42 AM
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Images like this led me to believe the transmission internal wiring was pretty simple...



Clearly, the 6HP26 is a bit more complex and not very repairable!!

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Old 01-20-2020, 09:14 AM
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Exactly. My understanding is that the TCM is actually inside of this assembly which makes this infinitely worse. I could not get INPA to connect which is what led me down this troubleshooting effort that discovered this issue.

The part that is damaged is the one and only round electrical connector for the valve body which is shown in the above pics of the mechatronic system.

Now my question is how screwed am I? As the above pics show I can separate the entire electronic portion of the mechatronic system from the mechanical valve body, it’s designed that way and that’s how you service the solenoids. That being said if I buy a used system I can pull the electronic portion off in this manner and swap it over to my mechanical housing assuming everything is the same otherwise in 6hp26x transmissions from N62 V8 E53’s.
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Last edited by 16g-95gsx; 01-20-2020 at 09:21 AM.
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Old 01-20-2020, 05:48 PM
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You need to buy a new valve body brain.
I just had my Valve body replaced last week (bought a rebuilt one from Revmax converters) and my mech said if it's at all possible, to keep my own Valve body brain as it's mated to my vehicle already and eliminates any errors that will occur when you use a used brain. There are companies out there that sell the brain with a valve body rebuild but I'm not sure.how much it will cost you to have it integrated with your vehicle. I believe it's possible, just a real pig.

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Old 01-20-2020, 05:53 PM
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http://www.bmwlogicseven.com/?p=3738

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  #10  
Old 01-21-2020, 07:17 AM
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Quote:
Originally Posted by wpoll View Post
Images like this led me to believe the transmission internal wiring was pretty simple...

Not the subject of this post, but just to point out that this ATSG diagram for the 5HP24 internal wiring is labelled incorrectly. I contacted them to provide them with the correct information and they subsequently issued this correction:



Phil
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