Big ask - need pinouts for A8 2.8 Sport ECU connector

[victormeldrew]

I finally decided, after she has sat for about 12 months, to get the old girl mobile again. I have a replacement ECU, and set about fitting it. The connector was dirty and corroded on a couple of pins, and more importantly one of the pins from the old ECU had broken off inside the connector. I dismantled the connector on that side, taken what I thought were careful notes, and cleaned it all up nicely. When putting the wires/pins back in according to my "carefully" recorded back of envelope schematic, I was horrified to find more holes on the connector than I had documented. Doh! Combination of hot sun and Becks methinks.

I have bought and viewed the full A8 wiring diagrams from erwin, but am none the wiser - for one they are in German. That was a waste of 30 euros. I have the Bentlet manuals from the US but they don't cover the 2.8 engine. I've googled till I'm pie-eyed but can't find what I need.

Does anyone else have either:

a/ an Audi 2.8 Sport (circa 96) that they can check the wiring on (which will mean pulling the top off the wiring box under the bonnet, disconnecting the ECU, and unclipping the back of the connector.

b/ a sensible schematic for said coonector which tells me in ENglish which wire goes to which pin?


A long shot I know, but I would be grateful for any assistance!

[victormeldrew]

Oh - the A6 2.8 probably has the same wiring, it's an identical ECU.

[victormeldrew]

Bump - anyone?

[adrianr]

Does the schematic show the connector?

I could tell you the translations for numbers and colours if that would help? Or at least I could once and might be able to remember.

AdrianR

[victormeldrew]

adrianr said:

Does the schematic show the connector?

I could tell you the translations for numbers and colours if that would help? Or at least I could once and might be able to remember.

AdrianR

No, there doesn't seem to be any schematic which just gives the connector and the wires connected to it. You get one or two pins maybe on one diagram, a couple more on another, and so on - there are 80 pins in there! Each diagram (and there are lots, literally hundreds) describe one "system" rather than one connector, and pretty much all "systems" run through the ECU. Complicated beasties these modern cars! I'm sure someone with a bigger brain than me might be able to stitch it all together, but I only bought a 24 hour non-printable view of the diagrams, and it was way beyond me.

A mate of mine who is fluent in Dutch and has passable German took a look, but was seriously lost with all the technical terms, so we couldn't even work out what many of the "systems" were!

Thanks for the offer though.

I may have to try Audi themselves, not sure how much help they'll be though. I suspect they might just p*ss themselves laughing - I would.

[davidy]

I would recommend taking to someone who knows what he is doing. I know from experience the A8 ECU is a complex piece of kit (I believe my car needed a new one when it departed from my company as various electrical systems were getting intermittent failures, my car was also a 96 car). The last thing you want to do is to destroy the new ECU or part of the loom/other electrical gadgets.

Just to give you some hope, when I was last getting tyres, a local A8 was also in there for rubber, this guy bought his (96) car at the same time as I bought mine, but his had now covered a staggering 275,000 miles and he had no real problems other than an appettie for wishbone bushes, so when they work they will do a big mileage.

All the best with getting it fixed. I sometimes miss mine, like the last week where I covered over 1500 miles and worked long hours, but I like the reliability (and running costs) of the Saab!!!

davidy

[victormeldrew]

davidy said:

I would recommend taking to someone who knows what he is doing.

Point taken, I'll avoid the Audi dealers then!

[yertis]

Not his specific field but I'd be surprised if Phil Payne couldn't help - he's a german speaker who understands Audi wiring diagrams.

www.isham-research.co.uk/quattro

[victormeldrew]

Cheers Yertis. I'll file that for future reference!

I have sorted my problem. A breaker is chopping the plug off a 97 car for me. I'm thinking of it as a £30 fine for not paying attention!

I will post the info for possible use by anyone else who might just be as stupid as me.

[VICTORMELDREW]

Here's the info for the wiring on the main connector to the ECU.

pin main tracer function
1 black grey live
2 brown - earth
3 red - tcu
4 brown green fuel pump relay
5 green purple abs
6 green yellow -
7 red blue tcu
8 green red aircon
9 - - -
10 - - -
11 red black hall sender
12 brown red air mass meter
13 grey - air mass meter
14 brown white lambda probe
15 purple - charcoal filter solenoid
16 - - -
17 - - -
18 green white -
19 green black immobilizer
20 white blue speed signal
21 - -
22 green - f125 multi function switch
23 blue - tcu
24 - - -
25 yellow - lambda probe
26 green - lambda probe
27 - - -
28 - - -
29 - - -
30 - - -
31 - - -
32 - - -
33 - - -
34 - - -
35 - - -
36 - - -
37 - - -
38 - - -
39 blue - lambda probe 2
40 grey - lambda probe 2
41 - - -
42 - - -
43 - - -
44 green purple hall sender
45 - - -
46 - - -
47 - - -
48 - - -
49 blue green tcu
50 - - -
51 - - -
52 - - -

That's a 97 model 2.8 142kw ACK engine code.

the breakers were f*ing useless on this, two different breakers sent me the TCU connector even after I emailed them a pic of the ECU (it looks nowt like), the first then didn't have an ECU plug and the second came up with a plug that fitted but was off a different model altogether and was wired completely differently. Big thanks to Steve at C & R in Nottingham for the info.

Edited by VICTORMELDREW on Monday 11th September 23:46