GMECM Digest V1 #162

[Ward]

All of the later (96 - 99) ECM's and PCM's have the DRAC built in

vituualy all of the GM systems are based on the number of tire turns in a
mile. the Vss sensors output either 2000 or 4000 pulses per mile. There are
a few exceptions, the 95 F car with manual xmish is different.

The Drac is a digital divider that standardizes the actual input to the ECM.
Older vehicle had the DRAC function in the instrument panel, like the 87 -
92 C/K trurk etc. 

And so it goes ....
Ward

On Fri, 25 Jun 1999 21:11:15 -0400, Peter D. Hipson wrote:

> Gee, got me... <g> virtually all vehicles with electronics: a TCM/ECM
needs
> to know how fast you're going. Ditto for the electronically controlled
> transmissions, too. 
> 
> At 05:06 PM 6/25/99 -0600, you wrote:
> >Which vehicle(s) used the DRAC as orginal equipment ?
> >
> >----------
> 
> Thanks, 
>         Peter Hipson (founder, NEHOG)
>         1995 White NA Hummer Wagon





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