ABY versus 3B Ecu pinout

[Jonas_R]

Sorry to bring up an old thread, but did any of you guys actually fire up their engine and do you have the correct pin out?

Also what extra sensor are needed to get it to run?

I have decided to use the 034 high output coil kit so I dont need the valve cover etc.

[S2central.net]

The wiring diagrams and training material from Audi are inconsistent on this - I have spent a little time looking at it.

The info at S2central.net for the ABY/ADU ignition wiring is correct for 1-2-3 as it checks out with several versions of the ABY & ADU schematics.

However, for 4 & 5 there is some confusion as the pinout info on the schematic is mixed up...

http://s2central.net/schematics/ADU_...ematicPg13.jpg - look at pins 1, 2 & 23 from ECU and see how they make sense of I1-I2-I3 and E1-E2-E3 on that POS unit for cyls 1, 2 & 3 but not in that order.


http://s2central.net/schematics/ADU_...ematicPg14.jpg - look at how the POS pins don't line up in a meaningful way - this error occurs on all the previous ABY schematics I have. I need to dig up the AAN Bentley for comparison.

Paul

[S2central.net]

The information I have from Tommy's site says:

Pin 1 - POS #1
Pin 2 - POS #2
Pin 20 - POS #4
Pin 21 - POS #5
Pin 23 - POS #3

HTH

I'm 99% sure that is wrong - it aligns to one Audi training manual I have for AAN, but does NOT align to many variants of the official schematics for ABY & ADU.

The schematics show--->

POS#1 - ECU #23
POS#2 - ECU #02
POS#3 - ECU #01
POS#4 - ECU #21 (or 20)
POS#5 - ECU #20 (or 21)


Paul

[S2central.net]

My AAN Bentley info is on CD - doesn't load under XP - and the old W95 machine I had it installed on has died another death.

Anyone else with AAN schematics out there we can use to reference this with ?

If all else fails I'll just have to buzz it out for posterity.

[spink]

heres what i have

[S2central.net]

To hopefully bottom this out, I have cross-checked all the wiring data I have and produced this spreadsheet to aid anyone converting a 3B loom for use with an AAN/ABY/ADU ECU and the necessary direct ignition (DI) wiring changes.

I know that TommyRS has done this in the past but I have NOT used his work as reference here - not that I don't respect it - just that I want to ensure we both agree and that any typos and mistakes can be corrected once and for all.

I think the main confusion is on the POS channels - everything else should align OK.


HTH,

Paul

[S2central.net]

heres what i have

Thats same as from AAN training manual - looks wrong to me with Pin 1 for Cyl 1...
Unless three versions of English ABY and RS2 schematics I have are wrong !!!!!!!!!!!!!

[Jonas_R]

Thanks Paul this is great info, will help me out when I do my conversion.

I actually have a complete AAN ECU harness, so I can check color codes if this help to 100% identify the POS channels?

Do you by any chance have stock RS2 boost and AFR chips that you could burn for me? I assume that I can use this software with my AAN ECU and 3 bar mapsensor?

[S2central.net]

OK - this is annoying me now... I got the old lapdancer fixed and a Bentley AAN CD-ROM working - it shows the following

POS #1 - ECU #01 gn/ws
POS #2 - ECU #02 li/sw
POS #3 - ECU #23 sw/gr
POS #4 - ECU #21 sw/ws
POS #5 - ECU #20 sw/ge

I just remembered I have a spare ABY loom sitting here - I'll check that too, but it will only verify pin colors from ECU pins to POS connectors - dunno if I can trust it 100% without a loom from other side of POS to the coilpacks.


Paul

[Jonas_R]

I though that there where markings on the POS, how do you then tell them apart if you installaing a new ECU harness?

[UrS4boy]

Thats same as from AAN training manual - looks wrong to me with Pin 1 for Cyl 1...
Unless three versions of English ABY and RS2 schematics I have are wrong !!!!!!!!!!!!!

They probably are wrong. I discovered this when I developed the 1.8t coil pack conversion. Check out this post and my comment about the incorrect POS pin-outs in Bentley (for the AAN):


http://forums.audiworld.com/s4s6/msgs/83686.phtml

[S2central.net]

I though that there where markings on the POS, how do you then tell them apart if you installaing a new ECU harness?

The only thing on the ABY/AAN loom to note is that the BROWN colored 4-pin plug is POS inputs for 1-2-3 and the BLACK 4-pin plug is POS inputs for 4 & 5.

Paul

[S2central.net]

They probably are wrong. I discovered this when I developed the 1.8t coil pack conversion. Check out this post and my comment about the incorrect POS pin-outs in Bentley (for the AAN):


http://forums.audiworld.com/s4s6/msgs/83686.phtml

Something is definitely amiss with the official schematics - the pin numbers called out on each POS connection don't line up properly. It is inconsistent.

This probably explains why I got confused looking at some scope traces a while back when investigating the solid-state distributor project - the POS triggers didn't line up in firing order with what I saw on screen but just figured I had a typo somewhere.

I'll get a look at the audiworld thread and hope that nails it...

[UrS4boy]

Something is definitely amiss with the official schematics - the pin numbers called out on each POS connection don't line up properly. It is inconsistent. ...I'll get a look at the audiworld thread and hope that nails it...

I know with 100% certainty that the Bentley was/is wrong. I wasn't the first to discover this. What cinched it for me was some X-rays of the POSs I found that showed the traces to the imbedded chip. With that info, it was easy to see how the Bentley was wrong about the N127 pin-out. I documented this back in Sept. 2005:

http://forums.audiworld.com/s4s6/msgs/83085.phtml

Paul: I will try to find the document with the X-ray views and link you to it.

[S2central.net]

Right then - the plot thickens - and hopefully resolves soon... Had a look at martynf's old thread about wiring for coil packs --->

http://www.s2forum.com/forum/showthread.php?t=10234&highlight=coil+pack

This shows that 4 & 5 are incorrectly shown in the Bentley AAN schematics and the ERwin ABY/ADU schematics.

Martyns info would align to Cyl 1 POS from ECU pin 1 if the pin numbers on the schematics are wrongly assigned.

If you transpose the sense of pin1 I1 and I3 on the Erwin schematics that I have then all the moons ot TommyRS, MartynF, UrS4boy & S2central line up with this -->

ECU #01 - POS #1
ECU #02 - POS #2
ECU #23 - POS #3
ECU #20 - POS #4
ECU #21 - POS #5

I'll double check and annotate some corrections to the ABY/ADU schematics that I have up at www.s2central.net - if someone used those without any other insight for wiring they could be in for a bad day of fault finding.

Paul