Re: reprogramming TPIS chip

[romans@starstream.net (Romans, Mark)]

Now this was a 32 mask, but it's a 86-87 code application.
The mask was changed to 88 and at C870 was 88 too.
I don't know if this would apply to an 86 mask 32, but it may. 86's are
almost the
same as 87-88, offset a few bytes.  If you change the mask to 32 but the
corresponding C870 is different then it may do the limp home
thing.  Even though the checksum is ok.
TPIS goes through some trouble to make it difficult to read/copy their
chips.
Mark
----- Original Message -----
From: "Dan Plaskett" <dynastydan@worldnet.att.net>
To: <gmecm@diy-efi.org>
Sent: Saturday, September 02, 2000 5:30 PM
Subject: Re: reprogramming TPIS chip


> I agree.  In fact I've told this guy that I'd much rather use the 89 6E
> calibration than the 32 or 32b but he wants to get a baseline with the
TPIS
> chip.  I've got my stock chip to use as a base if necessary but I can't
> figure out what they've done to force this limp home mode.  I think Mark's
> suggestion about a mask change along with a matching mask number later in
> the chip may be what's happening.
>
> Dan
>
>
> ----- Original Message -----
> From: "Bruce Plecan" <nacelp@bright.net>
> To: <gmecm@diy-efi.org>
> Sent: Saturday, September 02, 2000 4:53 PM
> Subject: Re: reprogramming TPIS chip
>
>
> > If you up in the terriotory of "level 5", I'd sure rather see ya start
> with
> > a good stock chip and go from there.
> > Maybe ask a lister for a copy of what the're using.
> > trouble is I think alot of guys are kinda like me, and just do one for
> > someone and delete it.  Just don't have the file room, and I' rather
have
> > them experiment, for themselves to actually get a grasp on things. (Not
> that
> > I've played with much MAF, anyway).
> > Bruce
> >   Still waiting on a post about tuning fuel on the 6E, or 32 masks.
> >
> >
> >
> > > Got a problem here that I remember someone batting around before.  I
> have
> > a
> > > couple of TPIS level 5 chips for 1986 Corvettes.  One uses the 32 mask
> the
> > > other 32b mask.  I used Tunercat to make a few mods and ran a
checksum.
> > > After burning the new chip the checksum verifies.  Install and the car
> > > sounds like it is hunting and the SES light flashes quickly off and
on.
> > > I've run into this before when I had a bad checksum, but that seems to
> be
> > > OK.  Any ideas.
> > > Dan Plaskett
> >
>
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