My V8 into an A4 like everyone else is now doing...build thread

[Nollywood]

75x is only hot during RUN and not START. Move the power for pin 21 to terminal 31 and it'll start right up.

Is terminal 31 correct? 31 is ground. Unless you mean terminal 30?

[bhusted]

Is terminal 31 correct? 31 is ground. Unless you mean terminal 30?

Yes. Terminal 30 not 31. Oops.

[spinnin_four]

Is VCDS actually able to connect to the ECU? Because thus does mean the ECU is powered up.

i actually do not have one, just an OBD scanner

[spinnin_four]

Crank sensor. If it's bad, incorrectly gapped or the flywheel pulse ring is in the wrong place for TDC, you won't get a spark, and the fuel pump won't activate.

i double checked it, it is the one that came on my v8 and ran before it was pulled, i used a washer to shim it in trans as it was contacting the flywheel, and it is a brand new 30v SMFW with pulse ring

[spinnin_four]

75x is only hot during RUN and not START. Move the power for pin 21 to terminal 31 and it'll start right up.

Daz was very specific that i put that wire at 75x, any idea why if it is not correct?

[spinnin_four]

So another thing i found, Pin 3 at ecu is not receiving 12v, its a black/blue wire and i traced it to orange connector in Pin 5? bottom left







Now, on my stock 1.8t harness orange connector has this same black/blue wire in same spot, also has it in top left Pin 4?and when i checked with key on i had voltage on this spot in body side of orange connector

[Nollywood]

i actually do not have one, just an OBD scanner

You definitely need to invest in VCDS. A generic OBD scanner is just that - generic. Some DTC's stored will not be picked up. Even the basic $12 VCDS Lite will be a good idea.

We need to dig deep into this. Is your harness set up to run the Motronic control relay?

Is there a switched 12V+ at pin 3?

[spinnin_four]

also, i did get some more of the lock carrier cut up and got my radiator to somewhat fit, damn its close, everywhere



Next i need to have outlets welded on and hope it clears haha

[Nollywood]

Daz was very specific that i put that wire at 75x, any idea why if it is not correct?

I have never used 75x for power. That runs through the X-contact relay circuit. It goes to accessories like electric windows, wiper motor, blower motor etc. The purpose is to cut power to these components while cranking the engine, assuming they were left on. This ensures there is sufficient voltage to start the engine.

If this is wired to provide power to your ECU, it would certainly power it up with the ignition on, and allow communication with VCDS. But power will be cut during cranking.

I might well be wrong, and Daz may have good reason for telling you to use terminal 75x, idk.

[spinnin_four]

You definitely need to invest in VCDS. A generic OBD scanner is just that - generic. Some DTC's stored will not be picked up. Even the basic $12 VCDS Lite will be a good idea.

We need to dig deep into this. Is your harness set up to run the Motronic control relay?

Is there a switched 12V+ at pin 3?

i will pick one up

Where is motronic relay and i am not sure

currently there is no voltage at Pin 3, i jumpered it and fuel pump came on, but still crank no start

[Nollywood]

i will pick one up

Where is motronic relay and i am not sure

currently there is no voltage at Pin 3, i jumpered it and fuel pump came on, but still crank no start

It's likely Daz didn't set up your ME7.1 harness to run via a relay. It's not really needed, and I don't know anyone even running Motronic ME7.1.1 who bothers with it.

Don't worry too much about the fuses not getting powered. They will remain in this state until the harness and ECU are configured correctly.

[spinnin_four]

It's likely Daz didn't set up your ME7.1 harness to run via a relay. It's not really needed, and I don't know anyone even running Motronic ME7.1.1 who bothers with it.

Don't worry too much about the fuses not getting powered. They will remain in this state until the harness and ECU are configured correctly.

so what would be the next step to get it running? should i jumper powe in the fuse box like the writeup on motorgeek?

like this:

Wiring:
This is the wiring you will need to do for: ATW, ATQ, AHA, and AWM (and AEB too probably but cannot confirm) for power to the coils and to get the fuel pump relay to work (and consequently communicate with the ECU)

This is in the fuse box. I jumped power from the thick black wire and ran it to the red and gray thick wire in the fuse box.
Image
Image
On the fp relay I cut the black wire amd ran it to ground. I spliced into the red and blue wire and used the same ignition power source for that. I ran a wire from the black wire in the fuse box.

[bhusted]

Daz was very specific that i put that wire at 75x, any idea why if it is not correct?

He told me the same thing and I corrected him on it. 75x is used for accessories and as such is "load reduced" so that more current is available for the starter.

[spinnin_four]

He told me the same thing and I corrected him on it. 75x is used for accessories and as such is "load reduced" so that more current is available for the starter.

ok, i will move it over to another 12v source,

any other info on getting the ECU fuses to have power? or the orange connector?

[bhusted]

On the orange connector, my V8 (ART) and V6 (AHA) have pin 5 on the orange connector with the black/blue. I'll have to dig through the diagram on a 1.8 to see where that goes. What engine code 1.8 do you have?

[spinnin_four]

On the orange connector, my V8 (ART) and V6 (AHA) have pin 5 on the orange connector with the black/blue. I'll have to dig through the diagram on a 1.8 to see where that goes. What engine code 1.8 do you have?

my 1.8t is AWM

The v8 harness has ECU Power Pin#3 on orange connector at Pin #5, but there is no power there, however on the 1.8t harness there are 2 black/blue wires on orange connector, one in Pin #4 and the other in Pin # 5, and when i checked voltage, the body side connector has 12v at pin #4

should i move the black/blue wire from pin #5 to #4?

[Nollywood]

This might help. It's a chart I put together when I just pulled my engine. My car is a 2000 model. It was a 2.8 30V APR code.

Audi A4 B5 2.8 V6 ME7.1 Vs Audi S6 C5 4.2 V6 ME7.1.1

Audi A4 - Brown plug:

1 = Green/Black.
2 = ?
3 = White/Blue
4 = Red/Black----Starter
5 = Black/Blue----Reverse lamp switch
6 = ?
7 = ?
8 = Black/Red
9 = Blue/Grey
10 = Yellow

Audi S6 - Brown plug:

1 = Green/Black
2 = White / Red----Oil level thermal sensor
3 = White/Blue----Inst. cluster combi processor
4 = Red/Black----Starter
5 = Black/Blue----Reverse lamp switch
6 = ?
7 = ?
8 = Red/White
9 = Brown/Red----Oil level thermal sensor
10 = Yellow----Instrument cluster combination processor.

Audi A4 - Black plug:

1 = Blue
2 = Green/Blue----Tachometer
3 = Grey/White----Oil pressure warning
4 = Red
5 = Brown/Yellow
6 = ?
7 = Blue/Yellow----Engine coolant level
8 = Red/Blue
9 = Blue/Brown----Engine coolant temperature gauge
10 = Brown/Red----Speedometer

Audi S6 - Black plug:

1 = Blue
2 = Green/Blue----Tachometer
3 = Grey
4 = Red----ECU constant 12V
5 = Brown/Yellow
6 = ?
7 = Blue/Yellow----Engine coolant level
8 = Red/Blue
9 = Blue/Brown----Engine coolant temperature gauge
10 = Brown/Red----Speedometer

Audi A4 - Orange plug:

1 = Red/Green
2 = Yellow/Brown
3 = ?
4 = ?
5 = Black/Blue
6 = ?
7 = ?
8 = Green/Yellow
9 = ?
10 = ?

Audi S6 - Orange plug:

1 = Red/Green----S229
2 = Yellow/Brown----S234
3 = ?
4 = Red/Blue----ABS 15a?
5 = Black/Blue----S232
6 = ?
7 = ?
8 = Green/Yellow
9 = ?
10 = Blue/Violet

Audi A4 - Red plug:

1 = Blue/Red (reverse switch)

Audi S6 - Red plug:

1 = Blue/Red (reverse switch)

[Nollywood]

Spinning, do you have the wiring diagram for the 4.2 V8 40V?

[spinnin_four]

Spinning, do you have the wiring diagram for the 4.2 V8 40V?

no i do not

[spinnin_four]

IT RUNS!!!! Kinda....

Orange plug, i added a PIN in #4 and T it with #5 so ECU has power now

inside the car, i moved the lead from PIN21 ECU that Daz added from 75x to 30, and i got fuel pump running and injector pulse but no spark

I did what the motorgeek writeup said and jumped power to the grey/red wire and if i crank it wont start, but as soon as i let off starter it catches and runs!!!!

it doesnt idle too well and EPC light is on, BUT IT RUNS!!!!!

uploading video right now!!

[Nollywood]

no i do not

You'll need it, otherwise you'll be working blind.

PM me an email address, and I'll send you both ME7.1 and ME7.1.1

[spinnin_four]

hopefully this works- photobucket is being a bitch and not letting me upload, so here it is on youtube!!

https://youtu.be/Uv-xjZbmnbM

[Nollywood]

Awesome! Now you just need to debug, and get things straightened out.

[Nollywood]

IT RUNS!!!! Kinda....

Orange plug, i added a PIN in #4 and T it with #5 so ECU has power now

inside the car, i moved the lead from PIN21 ECU that Daz added from 75x to 30, and i got fuel pump running and injector pulse but no spark

I did what the motorgeek writeup said and jumped power to the grey/red wire and if i crank it wont start, but as soon as i let off starter it catches and runs!!!!

it doesnt idle too well and EPC light is on, BUT IT RUNS!!!!!

uploading video right now!!

The highlighted part of your post above would suggest that you are connected somehow to terminal 75x.

[spinnin_four]

The highlighted part of your post above would suggest that you are connected somehow to terminal 75x.

i moved the ECU PIN #21 from 75x to the 30? next to it, i am shortening fuel lines now, but i will go back and check voltages while cranking next

[spinnin_four]

Thanks Nolly for the wiring diagrams, are they the same as A6 do you know?

Also, messed with it a little more this evening, its running much smoother, still only fires when i let off the starter, but now i have no throttle control at all, and EPC light is on, so i am assuming some wires need re arranged for the DBW?

The CEL comes on with key on, and goes off when the car is running, so that is working

heres a video at idle

https://www.youtube.com/watch?v=iKyylyFWWjU

[Nollywood]

The wiring diagrams are for both C5 A6 and S6.

Your DBW wiring will be correct. There's something else not right. That was how my car ran initially. It was rich as hell, and ran rough. I messed around for a while, and lost throttle control.

Yours is different though - at least it switches off. Mine would not turn off with the key.

[Nollywood]

Sounds like you're almost there, it's running smoother than in the first video. I would also be looking at vacuum leaks - all vacuum hoses, and the brake booster connection, especially the one-way valve.

[king84]

Heck, that ran smoother than my 32V. Sounds good.


#B5v8ABZswap
Sent from my iPhone using Tapatalk

[spinnin_four]

anyone have DBW wiring info?

i do not know why i do not have throttle control and EPC light is on

car is 2001 1.8t with 00 A6 motor/harness and 01 ECu- ME 7.1.1

Daz did the ecu and repinned harness to work with 01 ecu

any ideas?

[Nollywood]

The DBW harness is pretty much stand alone harness, and is the same for the 1.8 20V, 2.8 30V and 4.2 40V. It's all in the wiring diagrams I sent you.

I am positive the issues your conversion are having have nothing to do with the DBW wiring. Especially since the engine was responding to the gas pedal in the initial video you posted. You need to retrace your work. What have you changed since you first got it started? I would undo those changes, and take things from there.

You definitely need VCDS, or someone in your area who has VCDS. Get some logs up, so we can see what's happening. Because working blind can earn you a bricked ECU or a toasted harness.

[spinnin_four]

only things ive added was power to ECU PIN #3 via adding back/blue wire to orange connector at #4 spot and "T"ing it to black/blue wire in #5 spot and Ting power to red/grey wire at fuse box which i am told is for coil power

also i move ECU Pin #21 from 75x to the spot next to it- 30? i think?

[Nollywood]

When the engine first fired up, and it could rev, what was the wiring configuration at that time?

[spinnin_four]

When the engine first fired up, and it could rev, what was the wiring configuration at that time?

exact same as it is now, i didnt change anything, first fire it would rev a bit, EPC light was on then also, now nothing happens when i hit gas pedal... maybe a relearn is needed?

[Nollywood]

exact same as it is now, i didnt change anything, first fire it would rev a bit, EPC light was on then also, now nothing happens when i hit gas pedal... maybe a relearn is needed?

I'm not clear on this - on the original video, when you first got the motor running, was it responding to the gas pedal then? Or were the revs simply oscillating without any depressing of the gas pedal?

[spinnin_four]

I'm not clear on this - on the original video, when you first got the motor running, was it responding to the gas pedal then? Or were the revs simply oscillating without any depressing of the gas pedal?

it would rev with gas pedal- sluggish and wouldnt idle but it would do something...

next time i fire it up, idle is smooth but no gas pedal

[Nollywood]

it would rev with gas pedal- sluggish and wouldnt idle but it would do something...

next time i fire it up, idle is smooth but no gas pedal

So in between the above 2 actions, nothing was altered, in terms of wiring?

[spinnin_four]

So in between the above 2 actions, nothing was altered, in terms of wiring?

correct, i disconnected battery and walked away for an hour to mow my yard haha

[Nollywood]

How did you end up with an ME7.1 harness and an ME7.1.1 ECU?

[spinnin_four]

How did you end up with an ME7.1 harness and an ME7.1.1 ECU?

my donor car was an 00 A6 and after many talks with Daz he recommended that i use a ME71.1 ecu as there was a lot more he could do with it. so i picked up an ecu and sent it to him along with the harness

the more i think about it, i am wondering if my no throttle issue may have been because i just hooked up battery and started car, no relearn? doesnt explain the EPC light, but idk anymore