Connector identification fun!

[Barry Babcock]

Yeah, that's kinda what I was thinking, but I wanted to make sure I 
wasn't running with some important component disconnected/missing.

BTW, I've been using your writeup and diagram on the cruise control to 
troubleshoot my problem... no luck yet, but I'm making progress I think.

The vacuum pump works when I short it, and pumping soapy water through 
it revealed that it was clean.  I don't think I had a vacuum leak, but I 
replaced the lines for good measure.  The actuator on the intake 
manifold "sucks in" when the vacuum pump is running, but doesn't move 
the throttle body valve (is this right?).  The switches on the pedals 
appear to be well adjusted and clean, but I haven't checked the closed 
resistance on them yet.  As yet, the cruise function still won't engage 
at all.  My guess is a faulty column switch, mostly because I had to 
epoxy some brittle plastic bits in it that I broke while taking the 
column apart to get at the instrument cluster.  'Twas working before 
that, although it did seem to fail somewhat "gradually" afterwards.

Thanks very much, Huw, for making your repair experiences available. 
 You have saved me much time, and some frustration to be sure, in 
killing these gremlins.  This car remains, however, easily the most 
frustrating vehicle I've ever worked on.  And I've installed a 
twin-turbo unit in an RX-7, bazillion vacuum hoses and all.

Thanks again!
-Barry

Huw Powell wrote:

>
>> Working on my '87 5kcstq.
>> Anybody know what this yellow 4-pin connector is for:
>>
>> http://www.geocities.com/workhouse_master/underdash-001.jpg
>
>
> probably nothing.
>
>> I'm trying to get my busted cruise control working, so I've been 
>> taking stuff apart under the dash.
>
>
> It definitely isn't part of the cruise control.
>
> See if this helps:
>
> http://www.humanspeakers.com/audi/cruise.htm
>
>> I don't like it when I come across disconnected stuff.  But it really 
>> bugs me when I have no clue what said disconnected stuff is supposed 
>> to be there for--
>
>
> Often these are for features that aren't on your car.  Or weren't even 
> available on your car.  Sometimes there were two ways the car could be 
> (say, turbo or non turbo), and both are supported in a harness that 
> was used in every car.
>