80q cruise control

[Kneale Brownson]

If Huw doesn't chime in, try his website:  http://www.humanspeakers.com/audi/cruise.htm

TooManyAudis at aol.com wrote:  Gentlemen,

The cruise control on my 88 80q is no longer functioning, and I want you to 
do something about it.

Actually, a little diagnostic advice would be helpful.

The pneumatic components seem to be working correctly (air bladder, vacuum 
lines and vacuum switches Haven't checked the pump yet, but wanted to see if 
it was getting voltage first).

The brake and clutch electrical switches checked out ok.

My bentley is not with me, so I don't have that to assist me, and I have not 
dived into checking the column switch or the controller yet. In fact, I 
don't even know where the stupid controller is on this car. Any help here?

I did some very basic diagnostics while driving by hooking up the vacuum 
pump wiring harness to my multimeter.

the setup is as follows looking at the wiring harness

2
1 l l 3


Wire 1 -- Blue / Green
Wire 2 -- Red / Brown
Wire 3 -- Red / Blue

Hitting the cruise control produced the following:

Leads 1/2 No voltage recorded.

Leads 1/3 -- Momentary spike (up to 2+ volts,) then back to 0

Leads 2/3 -- Momentary spike (up to 2+ volts,) then back to 0

Any thoughts as to what it might be? Any idea on where the controller is so 
I can do a complete diagnostic on the system?

Thank you for your support.

Tom





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