Re: electronic speedo doesn't work

[paul.heneghan@bbc.co.uk (Paul Heneghan)]

From: "joe espana" <sbabbar2@hotmail.com>
>When I got it back, the speedo wasn't working for
>fear that the dearler may charge mne another 300 to fix that, I left. I did 

>check the hall sender in the trans and the voltage is in fact, fluctuating
>telling me the sender is working. The trip comp isn't getting a reading
>either which leads me to believe that the break in the wiring is between 
the sender
>and the trip comp controller. I don't know what to look for, so if anyone 
can
>help set me in the right direction, it would be greatly
>appreciated....Thanks...steve

This is what I found out about the electronic speedo/tacho on my 1989 Avant.

The chip that drives the speedometer and the odometer is an ITT UAF2115.  I 
couldn't find any reference to this chip anywhere, so I e-mailed ITT.  They 
sent me a PDF file with the data sheet for a UAF1025 which apparently is 
identical.

I also worked out the circuit diagram for the speed/odo circuit.  I drew 
this up as a CorelDraw drawing.

I could e-mail you the UAF1025 spec and/or the speedo/odo circuit diagram if 
they would be any use to you.  For the moment, I would concentrate on the 
sender and the wiring from the sender to the dash.

Paul
paul.heneghan@bbc.co.uk
1984 Audi 80 quattro
1989 Audi 100 Avant