Re: cruise control

["Christopher Morgan" <cmor@home.com>]

Actually, there is a vacuum servo attached to the accelerator pedal which is
the 'actuator' of the cruise system (it moves the pedal instead of acting on
the throttle body through a separate linkage or cable).  That's why you can
really 'feel' (through your foot, as the pedal moves) the cruise control at
work.  It is supplied vacuum from a dedicated pump in the engine compartment
(instead of just using engine vacuum - which goes away under heavy
loads/large throttle openings - like other systems).  There are two combo
vacuum dump valve/ electrical cut-off switches by the brake and clutch
pedals (these are very sensitive to adjustment).

Some (if not most or all) of the cruise control systems in the New cars are
fully electronic.  They are regulated by the engine ECM and work through the
same throttle body stepper motor that the ECM uses for idle speed adjustment
and/or electronic throttle actuation (drive by wire).

-Chris

----- Original Message -----
From: <VWaffe@aol.com>
To: <jettaglx@igtc.com>
Sent: Wednesday, December 01, 1999 11:47 PM
Subject: Re: cruise control


> I'm not entirely sure how it works on the Jet compared to my old car (96
> Chevy), but there should be a cable hooked up into the mechanism on the
> throttle body. The cable tends to stretch a bit, and could have come
> unhooked. Start looking around to find the CC control unit, there will be
> several vacuum hoses and a cable (if it's at all similar) coming/going, so
> find whatever looks to head toward the T-body...
>
> DJ
>
>