[s-cars] HELP! 1993 Audi S4 Fault code 2113

[CyberPoet]

First, Zac, where are you (geographically)?

I think we can rule out the ECU if both a substitute didn't
solve the issue and a Bosch service center said it was
faultless, although that does not necessarily rule out the
wiring between the ECU and the hall sensor.

The thing that comes to mind is that if the OBDC says the
hall sensor failed (a magnetic position sensor, usually
used to determine ignition position), and they replaced it
and it still says the hall sensor is failing, then either:
(A) they replaced it with a bad hall sensor, or;
(B) sensor is incorrectly installed, or;
(C) the wiring to the sensor is bad/shorting/loose, or;
(D) the pick-up location for the hall sensor has been
warped/mislocated over time (such as a bend shaft or casing
not seating it correctly although it visually looks right).

There is one other suspect that comes to mind from urban
legend (i.e. - gossip from others) based on your symptoms,
and I can't say that it even exists (I've never
investigated it), but rumors to the effect are sufficient
to warrant mentioning it: supposedly many Audi's have a
fuel cut-off system that is triggered if the crash
detection subsystem is activated (the same sensors that
trigger the air-bags, although if I understand it
correctly, the fuel cut-off occurs on a single sensor
triggering, while the airbags require two or more to trip
at the same time before igniting themselves). If this is
the case, then the reset for it is, the same rumors would
have it, supposedly under the rear seat, somewhere in the
vicinity of the battery...

I have seen the impact sensors go bad over time on other
makes and models, and if one was borderline, a jar or bump
might have been enough to push it over the edge.

PS - anyone else who can confirm or deny this fuel cut-off
safety system? I've always been curious...

I do wish you the best of luck!
Cheers!
=-= Marc Glasgow
Tampa Bay's Most Reliable Mac Consultant since 1990...
www.cyberpoet.net



Zac wrote:

> I have a '93 S4 that has a problem but I am completely lost as what it
> is or what to do.  A few weeks ago as I was driving to work the car
> suddenly stopped accelerating.  I coasted it over to the side of the
> road and let it idol for a few minutes before turning it off.  I had to
> have it towed to the shop and after they determined that the car is not
> giving the engine any fuel injection.  The engine will turn over but
> not
> start and is giving a fault code 2113 (Haul sensor).  We replaced the
> hull sensor and still the same code.  The shop I have it at determined
> that it was the ECU after they tested the wires connecting the sensor
> to
> the ECU.  I located a used ECU from Total Audi Performance in FL, but
> when plugged in it still gave the same 2113 code. The ECU from TAP was
> not tested but I find it very strange that both would have the same
> fault code.  We tested the connection wires again then sent back the
> ECU.  They ran through all the checklist again and still believed it
> was
> the ECU.  I then sent off the unit to a Bosch ECU repair center in FL
> and they call me today to let me know that they could not find anything
> wrong with it.
>
> Has anyone ever experienced a problem like this??  Does anyone in the
> Texas area have a car I could test my ECU in or a working ECU I would
> try?  I am getting rather desperate to at least find out what the
> problem is that I'm dealing with.  If anyone has any suggestions or
> information that might be helpful to me please contact me either by
> e-mail at Zachary_Rustad at baylor.edu or by phone at (254) 709-4547.
>
> Thanks
> -Zac Rustad