7730/ANHT code problem

[chetwagner at uswest.net]

The memcal is from a 4 cyl application, especially from a 2.3L 88 
Grand Am(7749).  The cyl select work when I use the code from a 
SyTy/Sunbird.  Unfortunately that is not the code that I would like 
to use, besides, I can't seem to get the engine to run when I set 
the 1bar/2bar setting to 1 bar MAP.

On 18 Aug 2000, at 12:57, Peter Gargano wrote:

> The memcal determines the limp mode parameters, including the
> cylinder select function. If you're running in limp mode with
> an 8 cyl memcal on a 4 cyl then the results may be unpredictable.
> 
> chetwagner at uswest.net wrote:
> > 
> > Just for starters, I am in the middle of a conversion that will be
> > using the 7730 and hopefully the ANHT/AUJP code.  That is if I can
> > figure out why the cyl select function in the code does not work.
> > No mater what the setting is set to, the engine doesn't run very well
> > and the scantool always shows the rpm as if the engine is a
> > V8 (this is a four cyl engine it is going on).  I do not know how to
> > read any of the code that is on the chip besides the data tables,
> 
> There is a "hack" of the ANHT code (c/o ECMguy), this will tell you 
> how the "code" handles a mismatch of the memcal mode (that is read 
> through the FMD chip) in the "hardware" versus the "software". I am 
> not really familiar with ANHT to give you an answer off the top of 
> my head.
> 
> > but maybe someone who does would be able to help me.  It almost
> > seems like the code was made specifically for the V8 and nothing
> > else.  Please help, any little bit is more than I have.
> 
> If you search for Ludis's information on the cylinder select function,
> and look at the schematics (for just about any P4) you should be able
> to convert a memcal from V8 to 4 cylinder by using a resistor from
> one of the memcal pins to either VCC or GND. But, as you suggest, the
> "code" may be V8 only?
> 
> HTH, Peter.
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