[s-cars] Cruise Control inoperable

[J. Khang]

It can also be the mechanical linkage to the throttle. The link is held together by a plastic component that becomes brittle with age (I forget what it looks like as I didn't get round to replacing it) and the link will separate if this component fails. Once this happens the cruise control system cannot control throttle position anymore. Follow the link back from the throttle and see whether it is still properly attached at the bottom.
 
Jonathan
 
JC wrote:
 
> I don't know how many older Audi cruises I've fixed... Type 44, CQ, C4...
> all about the same:
> - Underhood vacuum lines
> - Pedal/clutch switches
> - Stalk wiring
>
> Other possibilities exist but 90% of the time that's it. First two are easy
> - if you're lucky it's a quick replacement of the lines underhood.  Rewiring
> the stalk sucks (BTDT) but is possible.
>
> I've had mechanics insist it was a controller (or vacuum pump on a C5), and
> they have always been wrong.
>
> I did have a blown fuse issue last time but that was because the reverse
> light wiring was shorting in the hatch and blowing the shared fuse. Thanks
> to a lister for a tip after a lot of wasted time.