Fusebox internals - map/diagram

Sat Sep 25 11:26:24 PDT 2010

On 9/25/2010 9:38 AM, Ben Swann wrote:
> Spark testing on Coil on Plug engines where plugs are under sealed cover is not as
> trivial as on the earlier engines with exposed wires - but there are ways I can try.  If
> the injectors are triggered and fuse to the ignition coil packs is getting power then
> one may presume spark.  I don't think this is the problem unless part of a bigger
> problem.

Doh, I forgot about that.  And you can't use a timing light, either.  I 
presume it's also non-trivial to pull a plug and verify it visibly...

That's an interesting obstacle to checking the Big Three, isn't it?

> I do plan to provisionally wire everything hot to verify it is something in the way the
> relay is wired.
>
> All the wiring looks great, so beginning to think it may even be the ECU.  The ECU
> starts toggling the internal relay rapidly after being powered on for awhile.
>
> Ben
>
> -----Original Message-----
> From: Huw Powell [mailto:audi at humanspeakers.com]
> Sent: Saturday, September 25, 2010 2:23 AM
> To: Ben Swann
> Cc: quattro at audifans.com; '200q20V mailing list'
> Subject: Re: Fusebox internals - map/diagram
>
>
>
> On 9/24/2010 7:55 PM, Ben Swann wrote:
>> Huw your diagram is very useful even if it is not 100% accurate for the later fusebox!
>
> Thanks, glad it helped in any way.
>
>> I located the original problem in question - I had installed the main
>> power lead that should have gone to an L30 termanal on the N terminal
>> - this is a normally unconnected terminal.  Now I have ECU power.  All
>> power is now toggled on with ignition switch so progress.
>
> Excellent.
>
>> The problem I am having now is that the fuel pump relay does not
>> trigger on despite verification of good hall signal and new flywheel
>> sensors in place.  I verified the FP relay clicks while turning the
>> crank by hand  - hall going in/out of window, but for some reason the
>> pump does not come on.  I verified connectivity to the pump by bridging 30 to 87 and
> Fuel pump runs and I set the fuel pressure.  I put the correct relay in.
>>
>> It sounds like injectors are clicking and/or spark plugs igniting, but
>> no pump while cranking.  I have yet to pull codes with VAG COM, but
>> there should be no reason not to be getting good signal sync. -  new
>> flywheel sensors and flywheel pins in place and everything is factory clean.
>
> So why not crank it with the FPR jumped?  Have you tested for spark?
> Surely you have one of those $10 neon thingies for that?
>
>> I tried different FP relays including the original 7A relay that is
>> also used in 3B and other engines 8A0 951 253 L.
>> 8A0 951 253 B is relay used on ABY/AAN engines and that is in place now - same result.
>>
>> Motronic EFI for ABY is very diffent connections than the CIS cars and
>> there are 5 supplemental fuses in the harness.  The S2 wiring harness
>> does make it possible to mostly plug into the older style fuse boxes
>> whereas AAN harnesses need to be significantly "hacked".  There are
>> still a lot of wiring integrations to be made if one wants to retain the factory
> wiring as best as possible - me that is.
>>
>> I wired up according to the diagrams on S2 Forum
>> http://s2central.net/main_frame.html
>> but there is probably something I am missing or not connecting.  For
>> ex. With the ABY harness in place, I now have two wirings for
>> after-run circuit.  A bunch of stuff like that and differences in the instrument
> cluster connections and HVAC connections.
>>
>> I'm close and would be great to fire this engine up tonight!
>>
>> Ben
>>
>> -----Original Message-----
>> From: Huw Powell [mailto:audi at humanspeakers.com]
>> Sent: Friday, September 24, 2010 3:03 PM
>> To: Ben Swann
>> Cc: quattro at audifans.com; '200q20V mailing list'
>> Subject: Re: Fusebox internals - map/diagram
>>
>> On my diagram the ECU power comes from B87F, output from the fuel pump
>> relay - which is why that is usually labeled "Jetronic".  A G/Y wire.
>>
>> But that has to come with a grain of salt, because these fuse boxes
>> had the "spare" fuse on the side that was in this circuit, right?  And
>> then of course the EFI might be quite different from the CIS variants...
>>
>> On 9/24/2010 2:19 PM, Ben Swann wrote:
>>> Huw,
>>>
>>> I did find a way to print out yours - It is definitely helpful.
>>> There are variations between the boxes, but layout and terminals are
>>> mostly the same.  Some wires have been added or re-purposed.
>>>
>>> Looks like I may be missing the power supply lead in the ABY harness,
>>> or have it confused with a different lead.  I should have it figured out today.
>>>
>>> Hopefully the S2 will soon be on the road!
>>>
>>> Ben
>>>
>>> -----Original Message-----
>>> From: Huw Powell [mailto:audi at humanspeakers.com]
>>> Sent: Friday, September 24, 2010 12:50 PM
>>> To: Ben Swann
>>> Cc: quattro at audifans.com; '200q20V mailing list'
>>> Subject: Re: Fusebox internals - map/diagram
>>>
>>> Obviously, one route would be to do what I did, and use the Bentley
>>> as a source and rearrange everything.
>>>
>>> Since I suspect they are very similar, you could work with a printout
>>> of mine (it fits on 8.5 x 14 paper), and check it off against your
>>> diagrams to see if there are any differences.
>>>
>>> My diagram is probably the 85-87 type 85 fusebox, I don't know how
>>> much they changed, I suspect not much.
>>>
>>> On 9/24/2010 9:02 AM, Ben Swann wrote:
>>>>
>>>> I am re-wiring my '90 CQ for installation of S2 ABY engine.
>>>> Presently everything is hooked up to proper terminals as best as I
>>>> can tell, but don't seem to be getting power to the ECU.  Tracing
>>>> reveals that for some reason major portions of the fusebox are not
>>>> getting power.  The ignition switch and all electrical systems were
>>>> working when I pulled the 7A engine
>>> about 2 years ago.  I['m not ruling out a bad wire or switch.
>>>>
>>>> What would be helpful is a diagram or map of fusebox internals that
>>>> show connections between relays and terminals.  The one on Huws site
>>>> is helpful, but I'm wondering if there are any other versions that
>>>> can be printed out or have view of connections pertaining to '90
>>>> coupe quattro,  200 turbo quattro or even the S2 ABY in english of course.
>>>>
>>>> Ben
>>>> _______________________________________________
>>>> quattro mailing list
>>>> http://www.audifans.com/mailman/listinfo/quattro
>>>> http://www.audifans.com/kb/List_information
>>>>
>>>
>>> --
>>> Huw Powell
>>>
>>> http://www.humanspeakers.com/audi
>>>
>>> http://www.humanthoughts.org/
>>>
>>>
>>
>> --
>> Huw Powell
>>
>> http://www.humanspeakers.com/audi
>>
>> http://www.humanthoughts.org/
>>
>>
>
> --
> Huw Powell
>
> http://www.humanspeakers.com/audi
>
> http://www.humanthoughts.org/
>
>

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/