VSS operation

[rr]

Searching the '747 code, I have found these areas that reference the vss:

    transient map filter
    in idle discovery
    decel fuel cutoff
    open loop idle threshold
    knock retard logic
    egr enable
    tcc control
    shift light
    egr test
    open loop decel
    hiway spark adv
    IAC reset
    IAC idle control
    IAC throttle follower control
    vss diag

BobR.

washburn wrote:

> For some reason not many of my post seem to go through to this list. I sent
> this one about 8 hours ago the first time.
>
> I have a question for those in the know. This relates to doing some GM
> engine swaps into other vehicles. Let's use a 94 truck TBI 350  as an
> example. For this swap we'll say that I am not going to use the 4L60E tranny
> or connect the cruise control. I have read that the pcm uses the VSS to
> control things like EGR, idle when vehicle is moving without throttle being
> applied and evap canister purge. In my manual from Helm I can find no
> reference to the VSS in anything other than tranny controls, speedometer, or
> cruise control. So just what does the pcm really use the VSS for, anything
> other than tranny, and cruise or not? Is it different for a speed density or
> MAF TPI application or a newer Vortec?
>
> Thanks
> Paul Washburn
> lpwcruzr at sysmatrix.net
>
> ----------------------------------------------------------------------------
>

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