ABZ ECU wiring help! :: motorgeek.com

Bertoffski · **Posted:** Fri Apr 06, 2012 3:30 pm

ABZ in 4000CS. Motor and tranny (01A) are mounted, 034 insert, tapped for vr sensor ect.

Wired the starter circuit. Turns over great!

I need some help with the ECU wiring. I've found the ECU power which is running through the ABZ harness and ECU Relay... but I'm not sure where the ECU is grounded...

From the looks of it the ECU is grounded through the fuel pump relay via pin A4 on the ECU?... Is this correct?

I really don't feel like nuking the ECU with the 034 chip in it. Any help would be greatly appreciated!

Is the br/gn wire the ECU ground?!... Through the fuel pump relay.

Latest pic I have of the swap.

a4kquattro · **Posted:** Fri Apr 06, 2012 4:57 pm

No. thats the fuel pump relay control ground that the ecu uses to selectively cut or supply fuel when needed.

the primary ecu chassis ground pins are:

E7
E11
E12
D11
D12

As I recall, those terminate to one of the plugs that normally go to the fusebox on the A8, couple of big fat brown wires.

Bertoffski · **Posted:** Fri Apr 06, 2012 5:48 pm

a4kquattro wrote:

No. thats the fuel pump relay control ground that the ecu uses to selectively cut or supply fuel when needed.

the primary ecu chassis ground pins are:

E7
E11
E12
D11
D12

As I recall, those terminate to one of the plugs that normally go to the fusebox on the A8, couple of big fat brown wires.

Yep your exactly right... I don't know how I missed that in the diagram. They originally grounded to the A8 A-pilar.

So I'm going to want to retain the fuel pump control functionality with the 4000 pump correct?

Would I tie this to labeled 51/1 of the 4000 pump relay?.. which uses the signal from the Oil Pressure Cont. Unit.

It seems that was the control signal for the 4000 coil and fuel pump relay.

Then wire the ABZ ECM relay power and those should be all I'll need I think... Besides the O2 Heater powers and what not.

seiche · **Joined:** Fri Apr 21, 2006 12:27 pm **Posts:** 475

Do NOT use that stock 4000 relay as it has the rev limiter built in (that is why the ignition signal goes to terminal 51/1). Get one from one of the turbo cars, like a 200 and connect the BR/GN wire from the ABZ harness to the BS terminal on the fuseblock, and you will be good. Those relays also have the additional outputs (look a diagram from a 200 for the additional fuse block connections) so that you can wire in the addition circuits that the ABZ needs.

crappyoldaudis · **Joined:** Sat Feb 12, 2011 2:52 pm **Posts:** 792

jeez, you shoulda got a VEMS.

Bertoffski · **Posted:** Fri Apr 06, 2012 7:49 pm

seiche wrote:

Do NOT use that stock 4000 relay as it has the rev limiter built in (that is why the ignition signal goes to terminal 51/1). Get one from one of the turbo cars, like a 200 and connect the BR/GN wire from the ABZ harness to the BS terminal on the fuseblock, and you will be good. Those relays also have the additional outputs (look a diagram from a 200 for the additional fuse block connections) so that you can wire in the addition circuits that the ABZ needs.

Thanks! Like I said I didn't want to ruin this ECU so I thought I'd ask. Bummer I just sold a 200 Turbo without the motor for parts...
Does the A8 relay have the same terminal pattern?... I'll just order that one if I can't find a 200 or like relay.

crappyoldaudis wrote:

jeez, you shoulda got a VEMS.

It's beginning to look that way haha. I had all the stuff so I guess it is just the "lets see if I can do this" type thing. I didn't realize the VEMS ECUs were so inexpensive... If this gives me a headache then I'll go that route.

40v4kq · **Posted:** Fri Apr 06, 2012 9:14 pm

How about a build thread? I'd like to see more of this project.

Bertoffski · **Posted:** Sat Apr 07, 2012 8:46 am

Well I went to search for a 7 pin fuel pump relay this morning with no luck... Going to have to order it I'm thinking.

40v4kq wrote:

How about a build thread? I'd like to see more of this project.

Yeah I'll get one started today. I was going to wait till I got it apart and was painting it but I'll just start it now

Bertoffski · **Posted:** Sat Apr 07, 2012 9:56 am

Project Thread - viewtopic.php?f=6&t=46624

Katman · **Posted:** Sat Apr 07, 2012 10:16 am

You don't NEED the 7 pin 5000, /200 fuel pump relay. The extra pins are just for the fuse thingy on top.

If you can get my with only one high current output for the fuel pump, you can use a standard Audi "load reduction relay" in the fuel pump posiiton. It's just a 'standard' relay (2 side pins for trigger, and 2 larger pins for the output).

THis diagram of the new style 4k fusebox may help...

(From Huw's Audi page: http://humanspeakers.com/audi/" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false; )

Bertoffski · **Posted:** Sat Apr 07, 2012 11:13 am

Katman wrote:

You don't NEED the 7 pin 5000, /200 fuel pump relay. The extra pins are just for the fuse thingy on top.

If you can get my with only one high current output for the fuel pump, you can use a standard Audi "load reduction relay" in the fuel pump posiiton. It's just a 'standard' relay (2 side pins for trigger, and 2 larger pins for the output).

Wow, yeah that diagram is excellent! Thank you! So if I used a 4-pin relay I could just tie the fuel pump control from the ECM into one of the signals? Then just tie my other powers (02 heater ect.) into separate fused keyed powers...

Oh and I just realized that the harness for ECM connecter C (all the signal outputs) is not in my box of goodies... I believe this is only outputs to the gauge cluster... Will I be able to light this beast of without those signals going out?

VEMS is starting to look better and better lol

seiche · **Joined:** Fri Apr 21, 2006 12:27 pm **Posts:** 475

Katman wrote:

You don't NEED the 7 pin 5000, /200 fuel pump relay. The extra pins are just for the fuse thingy on top.

If you can get my with only one high current output for the fuel pump, you can use a standard Audi "load reduction relay" in the fuel pump posiiton. It's just a 'standard' relay (2 side pins for trigger, and 2 larger pins for the output).

Not quite true, the later fuel pump relays, like from a '91 200q (443 951 253 L), have two outputs. One terminal (87, high current) powers the pump, injectors, and the other (87a) powers the WGFV, ISV and carbon canister valve. The newer cars have similar relays. These would be perfect for what you are doing. Honestly, there really isn't much to it. YES, you also can and will need to integrate the car side harness, but you won't need much of it. I think you could get away with ignition power, battery power, and K line line for diagnostics. I'd also hook up the tach, coolant temp, CEL and maybe oil pressure stuff.

Sorry about being crotchety, but I've spent this week converting a new mark Vi Jetta to mark V GTI electrical system and engine. The wiring harness is one piece for the ENTIRE car and removing it means heating up and removing the glued-in firewall just to remove them (luckily I didn't have to do that part). I have removed about 20lbs of unneeded wiring (it is a race car) and have to integrate it all and code it all to work without most of the systems being present. I also need to make it so that things like the lights and wipers have one simple switch on the dash instead of being controlled by the stalks that will be removed. Very tedious and lots of hours looking at wires, the guts of modules, and diagrams working on the normal race car build schedule. It is also getting an AIM dash and all the other normal race car stuff like radio, GPS, camera system, etc. That part is easy. Yesterday was the PITA part crawling around the cage, race seat, fire system, etc. trying to find exactly where everything will go so it can all be wrapped and installed so no one (especially me) will ever have to worry about or touch it ever again...

Bertoffski · **Posted:** Sat Apr 07, 2012 2:17 pm

seiche wrote:

Not quite true, the later fuel pump relays, like from a '91 200q (443 951 253 L), have two outputs. One terminal (87, high current) powers the pump, injectors, and the other (87a) powers the WGFV, ISV and carbon canister valve. The newer cars have similar relays. These would be perfect for what you are doing. Honestly, there really isn't much to it. YES, you also can and will need to integrate the car side harness, but you won't need much of it. I think you could get away with ignition power, battery power, and K line line for diagnostics. I'd also hook up the tach, coolant temp, CEL and maybe oil pressure stuff.

Sorry about being crotchety, but I've spent this week converting a new mark Vi Jetta to mark V GTI electrical system and engine. The wiring harness is one piece for the ENTIRE car and removing it means heating up and removing the glued-in firewall just to remove them (luckily I didn't have to do that part). I have removed about 20lbs of unneeded wiring (it is a race car) and have to integrate it all and code it all to work without most of the systems being present. I also need to make it so that things like the lights and wipers have one simple switch on the dash instead of being controlled by the stalks that will be removed. Very tedious and lots of hours looking at wires, the guts of modules, and diagrams working on the normal race car build schedule. It is also getting an AIM dash and all the other normal race car stuff like radio, GPS, camera system, etc. That part is easy. Yesterday was the PITA part crawling around the cage, race seat, fire system, etc. trying to find exactly where everything will go so it can all be wrapped and installed so no one (especially me) will ever have to worry about or touch it ever again...

Sounds like you've got a busy schedule! I just noticed your in Arvada, I'm like and hour north of you in Wellington. I want to get this all running by Bug In at Bandimere... or at least before summer's up.

So I'm going to order the relay you suggested and tie into it. I'll have track down the loom or at least a connector for C on the ECM so I can wire the car side of things. Starter and Alt. are hooked up and it cranks now. Just need to get the ECM wiring squared away and get the motor to light off.

Anyone have a pinout diagram of the ABZ ECM out of a wiring diagram? One with just the pins labeled? following the tracks on the diagram is starting to get annoying...

Nollywood · **Posted:** Mon Apr 09, 2012 4:01 am

^^^I have the complete wiring diagrams for the D2, from '95 - '99. Let me know if I can be of help, it's all in PDF, but I can send you screen shots, if you let me know what exactly you need.

Bertoffski · **Posted:** Mon Apr 09, 2012 7:09 am

Thanks, I have all the wiring diagrams... and I even think I have all the wiring figured out. Now just finding some time to work on it this week! I was looking for just a connector view of the ECM with the pins labeled so I wasn't constantly.chasing tracks in the wiring diagram, but. Just got creative with some colored pencils and made a little reference key haha

arturito · **Joined:** Fri Jul 31, 2009 9:35 pm **Posts:** 37

seiche wrote:

Do NOT use that stock 4000 relay as it has the rev limiter built in (that is why the ignition signal goes to terminal 51/1). Get one from one of the turbo cars, like a 200 and connect the BR/GN wire from the ABZ harness to the BS terminal on the fuseblock, and you will be good. Those relays also have the additional outputs (look a diagram from a 200 for the additional fuse block connections) so that you can wire in the addition circuits that the ABZ needs.

Hey, i'm working on the same project like Bertoffski, so i found this post of yours. I wanted to ask you to explain me more about this "connect the BR/GN wire from the ABZ harness to the BS terminal on the fuseblock" what is BS terminal on the fuseblock?

because i want to wire a relay and don't know where to put that br/gn wire, thanks in advance help

A8myFiero · **Posted:** Mon Jul 23, 2012 8:18 pm

I have a project going and if 1 of you have the ABZ ECU wiring schematic could you send it to me at engman10@mail.com thanks oh ya if it matters mine is a 1998 thanks

ABZ ECU wiring help!

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