Fusebox internals - map/diagram

Fri Sep 24 23:22:47 PDT 2010

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/