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[Solved] Problem with 3b harness, dont know what it is?!

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 Post subject: [Solved] Problem with 3b harness, dont know what it is?!
PostPosted: Sun Sep 13, 2020 2:38 pm 
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Joined: Tue Jul 30, 2019 5:03 pm
Posts: 16
Okey, here we go again :)

Working on my 3b harness, thought I could start plugging it in this afternoon, but found 2 contacts I do not know where they go?

Both of them is a 2-pin contact.
The first one of them have a Yellow & brown cable, the yellow comes from a fused wire with blue/red cable
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The second one have 3 cables, one red/black one black/red and one brown/black, the red/black runs to a connector and the to the black OBD(?) plug
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The black/red was taped to a green/red cable
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Last edited by zimmen on Tue Sep 15, 2020 10:23 am, edited 1 time in total.
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 Post subject: Re: Problem with 3b harness, dont know what it is?!
PostPosted: Mon Sep 14, 2020 9:11 am 
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Are the two connectors on the engine bay side of the harness or cabin? The 3 pin one looks like it could be for the altitude sensor(in the cabin by the ecu)

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 Post subject: Re: Problem with 3b harness, dont know what it is?!
PostPosted: Mon Sep 14, 2020 11:47 am 
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yodasfro wrote:
Are the two connectors on the engine bay side of the harness or cabin? The 3 pin one looks like it could be for the altitude sensor(in the cabin by the ecu)


The 2 connectors are in the engine bay, Its not the altitude sensor, I have all the connectors sorted out except these two, I have traced every one of them from the ECU with this pinout schematics http://s2central.com/motronic_pinout_3B.html and http://s2central.com/motronic_02.html

I think one of them is to the auxiliary after-run pump or might be named Turbo coolant pump (TCP)? Because I don't have a connector to that one. And what I can tell from reading this article (https://forums.quattroworld.com/s4s6/msgs/21503.phtml) the pump should have constant power.

But then the wire colors don't match the one I have, and then the next problem is that I don't have a "control module" (447965571A) and can't find how to wire that one up.


Last edited by zimmen on Mon Sep 14, 2020 1:03 pm, edited 1 time in total.

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 Post subject: Re: Problem with 3b harness, dont know what it is?!
PostPosted: Mon Sep 14, 2020 12:52 pm 
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Just found a flow diagram and the connector with 3 cables is the one to the "auxiliary after-run pump/turbo coolant pump (TCP)" http://www.s2central.com/S2_Schematics/D/D34-09.pdf

Now i just have to visit my scrapyard to see if i can get hold of a bracket, the control module and a contact to this.


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