OEM MK4 management wiring => Mk1/2/3 harness install FAQ (Now with added dieselness!)

So, 409 relay into the mk2 fuse box with the trigger to G1/3 and it works, trigger to prime the pump on ignition on.

Doesn't do it every time, I guess due to ecu logic etc. Can't confirm the trigger comes on during cranking or running yet, but I guess it'll work fine.

 

Hi all

Has anyone else used the secondary coolant pump used on the BAM engines?. Im thinking about using it if poss, just thinking about the wiring.

Could i run a wire from T14a/13 to say A1/07 on the mk2 ( CE2 ) fusebox. Using the same power feed/relay as the radiator fan after run switch. Or do i need to try use the fan control unit from the Audi TT loom i used as donor.

Thanks in advance of any info.

 

Thank you very much for the response. Very helpful.
I have the fan control unit and some wiring but i dont think i have the rest of the loom.
The control relay would be in the car or engine bay, do you know?. I have a relay panel from the TT that holds like the fuel pump relay and relay #100 etc. Would it be on there do you think?.

Thanks again for the info.

 

"ECU relay notes:
Regarding brown plug T6/1 this is a little complicated so bear with me! To start with if you have an AGU style loom which didn't originally have an ECU relay in the engine bay then run this to your ECU relay power output, G1/10 for CE2 or relay pin 87 for CE1, simples. If you have a later AUM/AUQ style loom with an ECU relay in the engine bay then you will need to run this pin to an ignition live source, D/2, D/7 for CE1 or G1/10 for CE2. This is because the ECU relay on these cars is triggered by the ecu, and it will need a straight ign live feed to switch it on so it will then know to trigger the relay. Weird I know! With this type of loom you have 2 choices with the ECU relay, either leave the factory relay box in place or move the relay to your fusebox. If you move the relay the old purple trigger wire from the ECU will need to go to the ECU relay pin 85 on CE1 or G1/7 on CE2."

So T6/1 goes to G1/10 for both types of loom?. Im not sure if im reading this correct. I have a ECU relay in the engine bay, so as im leaving it in, i dont need to change anything?. Only go to G1/7 IF you move the relay yes?.

Thanks in advance of any info. ( I found the relay for the above question, thanks for the pointers. )

 

Thank you, was doing my nut a bit trying to work it out. As i am gonna leave the ecu relay in place ill just connect to G2/4 as advised.

( You have no idea how you have helped me over the last 4 months building this loom for my mk2 conversion. If your ever out Norfolk way, give me a shout ill buy you a drink )

Thanks again

 

Hi I've got a 1.3 mk2 with ce1 i was wondering if you could Shed some light on the wiring, how difficult is the splicing compared to ce2? Im looking into the pd route or the 20vt route if this helps, and will be using a complete donor car.

 

hi bud whats the difference between t10 orange pin 2 - green/red to ecu T121/81 (Tach signal from ecu via tach adaptor to G1 pin 12) taken from the other 1.8t thread and t10 orange pin 9 in both threads they are for the rev counter

 

In my Audi wiring diagram for the 1.8t 20v it says (T10x is orange plug)
T10x pin 2 is from "ECU to T32 plug pin 25." * Only models with on-board computer *
T10x pin 9 is "Connection (engine speed signal), in dash panel wiring harness"

So maybe pin 2 is from the ECU to tell the on board computer the revs and pin 9 is from the ECU to the dash/rev counter.

Hope this helps

 

I posted this in a random thread by accident earlier, duh!
Hi, im doing an auq into mk1 with ce1 fusebox, just looking a bit of clarity on a few parts;
I have an ecu relay but cant see a 2 pin plug? only T10e has 2 wires in a 10 pin plug but they match the blk/red and wht/yel for brake switch
t6 brown - pin 1 has two black wires, is one of these ecu power? do i wire this to pin 87 of the ecu relay so it is on with the coils?
also my t14 has half the wires a different colour and nothing on pin 10 is this most likely just colour difference? does pin 10 need connected to g1 if it was never used?

thanks, this is inevitably the first of many posts!

 

This is one half the plug your looking for...if your ecu relay is still in the black box it comes out of the loom not far under it. Black box "may" have two relays in it, one is for the sai and the other the ecu. This plug connects the two halfs of the loom together, one on the engine loom and one on the bay loom. Good luck

 

cool cheers, I found it in the end but hadnt considered it the one i was looking for although its been part of my stripped loom i've starred at for ages! It has a pretty thick red white wire going to it from the ecu relay.
next question... do i still need to connect pin 8 (blk/pur) of the t14 to the pin87 ecu relay if i have the relay connect as described later in the guide?
and what is alternator pin DFM?