[Gmecm] 7747 real-time tuning

[David Allen]

  This maybe comparing apples to oranges but... When using my Romulator and
Cats' RT Tuner I get intermittent code for EPROM error.  Never get a SES
light but after tuning session, if I pull codes that one is in there. Has
not caused any issues with the operation of the ECM or tuning hardware.
  Whenever you adjust the contents of the emulator, the RT tuning software
adjusts the parameter you tweaked, and updates the checksum at the same
time. but somehow the code still sets intermittently.
  Now I have not tried to read ALDL data during tuning because one of my
computers now has a dead com port :-(
  Later,
David


----- Original Message ----- 
From: "Charles McDowell" <charles at taildragger.info>
To: <gmecm at diy-efi.org>
Sent: Tuesday, March 21, 2006 5:30 AM
Subject: RE: [Gmecm] 7747 real-time tuning


> I'll give this a shot and see what happens.  If it works, I'm confused
about
> how it ever worked with the emulator, since I've never had the checksum
> disabled, and I was tuning in real time (and seeing BLM's) for a while.
>
> Thanks.
>
> -----Original Message-----
> From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On
Behalf
> Of Programmer
> Sent: Monday, March 20, 2006 12:21 PM
> To: gmecm at diy-efi.org
> Subject: Re: [Gmecm] 7747 real-time tuning
>
> To start, set byte $04 to "AA" instead of "42".  This will set a 'checksum
> ignore result'.
>
> I'd think code 51 and no BLM updates would be hand in hand...pretty much
> anything in the code would be ignored with code
> 51 set.
>
> Lyndon.
>
> ----- Original Message -----
> From: "Charles McDowell" <charles at taildragger.info>
> To: <gmecm at diy-efi.org>
> Sent: Sunday, March 19, 2006 7:22 PM
> Subject: [Gmecm] 7747 real-time tuning
>
>
> > I'm working on tuning my Blazer with transplanted 7747.  I got an
> > "Ostrich"
> > from Moates.net and I'm using Tunerpro RT to do adjustments with the
> > engine
> > running.  I'm monitoring things with WinALDL since I'm used to that.
> >
> > One thing that's happening is that I'm getting a code 51, "PROM error".
> > What does this mean?  At first I thought bad checksum, but I don't think
> > that's it, because I've had bad checksum before, and it results in a
rapid
> > flash on powerup and SES light, neither of which I get in this case.
The
> > engine starts right up with no SES light or anything, I just see the
code
> > 51
> > in the ALDL data.  What else could it be?
> >
> > Another question I have is why I don't always get BLM value updates.
For
> > example, I was tuning in my 800/40 VE cell and I upped the idle to 1200
> > RPM
> > to try and see what was happening in that cell.  Once I got to 1200 RPM,
> > WinALDL showed no BLM or INT data.  The system was still closed loop at
> > the
> > time.  What decides whether BLM values come out or not?
> >
> > Thanks for any help.
> >
> >
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