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Re: VSS Questions



Hi Mike. The engine is now in a 1984 Jaguar XJ6.
The VSS *generator* is on the 700R4, sends a signal to the ECM, the cruise
control and the speedo through this *buffer*. Problem is, I don't know exactly
which of the 5 wires does what. Using colors and the rest of the harness, I
believe I have found out which is B+, and which go to the cruise and the speedo.
Apparently one is input from the VSS gen and another sends the buffered signal
to the ECM, which applies 12VDC to the wire and then *reads* the buffered signal
by the *grounding* of this signal. My O'scope doesn't help.
This must be specific to the GTA digital dash.
Thanks for your help.--JB

Mike Rolica wrote:

> What is the motor going in??  I used the vss of s10's or carbed camaro's. it
> is a optical sensor that sits in behind the speedo.  Three wires come off of
> it and go to a yellow box.  The yellow box has 3 wires one ground one power
> and one signal..
>
> Another thing you can do is use a vss used on most amc's with cruise.  It
> sits between the speedo cable and trans..
>
>                 -----Original Message-----
>                 From:   John D. Bachman [SMTP:jdbachman@redrose.net]
>                 Sent:   Wednesday, May 31, 2000 7:27 AM
>                 To:     gmecm@diy-efi.org; diy_efi@diy-efi.org
>                 Subject:        RE: VSS Questions
>
>                 "John D. Bachman" wrote:
>
>                 > Hi.
>                 > Trying to sort out the VSS in a transplanted '87 350 TPI
> 700R4 (from a
>
>                 > Trans Am/GTA). A while back, I bookmarked something from
> the old
>                 archives
>                 > titled: GM 4 out buffer. Now I can't seem to retrieve the
> info, just
>                 > when I need it the most...
>                 > Can anyone provide the pinout for the 4 out buffer (yellow
> box) from
>                 the
>                 >
>                 > T/A? Or for the proprietary GM IC inside the box?
>                 > Very much appreciated--JB
>
>                 OK, so I downloaded the archives, brought them up in Word,
> did a *find*
>                 for buffer and got an answer, from May 1999.
>                 Problem is, the IC on the *4 out buffer* from this GTA is a
> Motorola
>                 6758E, not 6962H like the post from the archives describes
> (from an '89
>                 Caprice).
>                 Can't find anything about the Motorola chip in my books, on
> the 'net or
>                 anywhere else.
>                 Does anyone have any information about this IC, or a wiring
> diagram
>                 showing this 4 out buffer?
>                 Thank you --JB
>
>
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