Knock sensor light on '89 90 quattro?

[Huw Powell]

> While fumbling through the Bently trying to intigrate
> the ISV to the EFI, I notice that the '88 90q had a
> knock sensor light connected to terminal 3, I think,
> on the ignition control unit.  I'd love to have one of
> these on my car so I can better keep an eye on things.
>  I'm pretty good at reading the diagrams, but am a
> little confused if it will be possible to hook up.
> Anyone done this on an '89?

Very interesting.  (p. 25-20-8 in the B. for those who wish to follow
along at home...)

that light appears to be attached, as you say, to terminal 3 of the
ignition module, which is also attached to:

1. terminal 13 of the fule module
2. somewhere far away, the Auto Check Control Unit (to be expected)
3. on "some" 88's, terminal 10 of connector "10a"
4. on "some" 89's, terminal 1 of connector "2f" (is this under the
drivers side knee panel?)
5. the real juicy one, terminal "49L" = "ILa" on the fuel pump relay!
this appears to be unused in the fpr itself, and might make an easy
place to experimentally tap into the signal.  Especially considering how
it looks in the Bentley, it looks like this *might* be one of the
connections to the fuse socket on top of the fpr?

--
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/