[Gmecm] $58 F29/F29E VE lookup weirdness

[Dig]

The problem there becomes the size of the table. There's a bug in the 3d table lookup that fouls up lookups over a certain size.

Our F29x is 16x32.

Dig

-----


BTW: If I've got it right, conversion of the code to a version of _F29_ that 
goes up to 6400 is just a case of NOPing out some lines and using a hex 
editor to set up the extended part of _F29_. If it ever stops raining, I 
hope to test this out...

Thanks,

Rob

----- Original Message ----- 
From: "Dig" <turbodig at yahoo.com>
To: <gmecm at diy-efi.org>
Sent: 23 August 2007 17:22
Subject: Re: [Gmecm] $58 F29/F29E VE lookup weirdness


Sort of a well-known bug... The ALDL stream is reporting erroneous data.

It doesn't seem to be real; there is no corresponding fuel hit that I've 
ever observed.

I haven't as yet found the cause, but I suspect it has to do with the timing 
of the routine involved in sending data and the fuel routine.
It's on our "to do" list for code59.

----- Original Message ----
From: Rob Handley <Robin at FuryWorld.fsnet.co.uk>
To: gmecm at diy-efi.org
Sent: Wednesday, August 22, 2007 2:35:22 PM
Subject: Re: [Gmecm] $58 F29/F29E VE lookup weirdness

Tried it with a code modification to provide a hard-wired 'MAP' value to use
in the F29 look up, and the look up routine still regularly returned zero!

Robin

----- Original Message ----- 
From: "Rob Handley" <Robin at FuryWorld.fsnet.co.uk>
To: <gmecm at diy-efi.org>
Sent: 22 August 2007 09:03
Subject: [Gmecm] $58 F29/F29E VE lookup weirdness


> I've been looking at VE for the last few days and, after putting test
> values in F29, F29E, and F30 I spotted the VE regularly (every ~6 secs)
> reverting to the F30 only value. Looking back at one of last year's logs
> this was happening then too. It also happens with the ignition on and the
> engine not running !
>
> Has anybody seen this or have any suggestions why the table look up (as
> used for F29 and F29E) should be returning zero every now and then? I find
> the table look up code hard to follow.
>
> Robin
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