[Gmecm] $58 F29/F29E VE lookup weirdness

[Dig]

Interesting....  details?

----- Original Message ----
From: Rob Handley <Robin at FuryWorld.fsnet.co.uk>
To: gmecm at diy-efi.org
Sent: Thursday, August 23, 2007 6:34:02 PM
Subject: Re: [Gmecm] $58 F29/F29E VE lookup weirdness

Had another look at this. I've just tried a chip where my enlarged F29 
looked up VE _overwrites_ the last value of VE - rather than setting VE to 
zero (in place of the F30 look up) and later adding on the F29 looked up VE 
value. The idea of this was so that there would be no CPU cycles when the VE 
byte had zero in it. Based on a quick engine off test, this seems to have 
done the trick; I saw no VE flicking on my ALDL monitor.

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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