Buggy GM code - was Re: 165 to late MAF

[Peter Gargano]

Bruce, just where you were looking at the MAF tables, at line LC6A9, there's 
a table, the entry for 34.1 g/Sec (at location $C6AE, or offset $06AE) that 
has an FCB value of 182. Now in fact, the BUA binary has a value of 132 in this 
location - 132 - 182 - Obviously the GM coder who made the ROM table was
reading 182 and typed 132 (an obvious visual mistake!) - and the ECMguy realised
the error, and plugged in the correct value !!!! (this was one of the first
differences between the .PDF listing and the .BIN that started me wondering
about which was correct - the listing or the binary).

So, for those people running an unmodified BUA EPOM, consider changing (fixing)
your MAF table at offset $06AE from $84 to $B6.  Now, I can't say if that'll
make any darned difference, but, it's an example of buggy GM PROMs !!!

Bruce Plecan wrote:
> 
> Going by what I read in the ecmguy's HAC the 165 MAF is Frequency.
> Starting at 069A (ref BUA), we have the Ld var for scaling LV8 Scale
> Factors,
> and just before that we have MAF frquency 34-150 Hz, sounds like frquency to
> me.
> Grumpy
> 
> | Waaait a min, how are you getting around that the new GM MAF is frequency,
> | and the old is voltage? Build a translator box for freq to volt?
> | At least with the Porsche 928 MAF it wouldn't need any translation...
> | Maybe one of the code wizards can rewrite the code so it can use a freq
> MAF?
> | I'm awaiting this as I want to start modifing my 89 and one of the first
> | things that I want to upgrade is the entire air inlet tract (Firebird).
> | Tom
> |

-- 
Peter Gargano, Tech Edge Pty Ltd.,  mailto:peter at mail.techedge.com.au
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