How does cruise work?

[Huw Powell]

On 11/29/2010 12:18 AM, urq wrote:
> The vacuum module has a pump and a vent valve.  If the computer wants to
> increase the throttle it runs the vacuum motor and if it wants to reduce the
> throttle it opens the vent valve.  When the cruise control is off the vent
> valve is opened.
>
> You can test for leaks by removing the line at the pump ... the rest of the
> system should hold vacuum.  If you don't have a vacuum pump...

You can "hot wire" the cruise pump to test the system for leaks.  I 
forget which two wires to put ground and 12v on, though, and I don't 
think my diagram shows wire colors.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/