C4 (vette) dash

[Mike Martone]

Thanks for the info.. looked it up and found exactly what i've been
searching.....of course.. this just adds more questions....such as...the
serial data line going "to" the ecm from the cluster....do the sensor analog
conversions and multiplexing take place at the cluster before heading into
the ECM?... and hey.. by the way.. exatly what kind of bit resolution is the
A/D converter producing?

I'm just starting to dig into the ECM stuff and i'm not seeing a whole lot
of hardware info out there besides bin files and prom editors....which,
resides more in the firmware realm of things.

later,
knucklehead


----- Original Message -----
From: Red86 <henders at ameritech.net>
To: <gmecm at diy-efi.org>
Sent: Thursday, November 02, 2000 10:24 PM
Subject: Re: C4 (vette) dash


>
> Try:
>
> http://batee.cc.umr.edu/corvette/index.html
>
> for starters.
>
> Also, my '86 ALDL has only the 160 baud rate.
>
> Jim
>
> On Thu, 2 Nov 2000 14:47:09 -0500, you wrote:
>
> >would anybody happen to have a source for locating a C4 vette instrument
cluster schematic? I'm particularly looking for the header strip pinout that
mates the controller card to the display card. Also, what's up with the ALDL
having 2 different (from what i've seen) data stream pin locations. mine is
a 7165 ecm (or, it's supposed to be as the MAF has the relay setup rather
than the burnoff module arrangement). year is '86/ L98. One drawing i've
seen shows the pin at location M while a full blown schematic shows it at
pin E. did Chevy pull a mid-year boner in that they threw some leftover 870
ECMs into these vettes or worse yet....did some early XXX7165 ECMs still
transmit data at 160 (gack) baud rates before going to 8192?
> >
> >and hey, while i'm curious...what is the exact function of the .ecu files
i keep reading about?
> >Oh...and hey.....does anybody know what the difference is in the motorola
S19 format vs. the motorola S9 format?
> >thnx in advance,
> >
> >blockhead
>
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