[Gmecm] Torque converter clutch on 1226869

[David Allen]

  Okay - TunerCat has a special version of the $24A definition not listed on
their site.  It's called $24AT.  It appears pretty thorough, IHMO.  I would
say at least 85% are called out in the definition.
  Good point about the shift-lamp being on a different pin.  I will test
that next and see if I can locate the TCC signal.  However the scan data
shows the TCC as never being "ON."
  The 125 did have an internal high-gear switch.  My modified 440-T4 has
switches which can be used to provide the same function however the 440
needs to lock in 3rd at part throttle. I can handle that part of it if I can
get the basic control from the ECM.
  There is a copy of the base calibration in the .bin library, linked below.
  Thanks for the help!
David

ftp://diy-efi.org/pub/gmecm/bin_lib/1226869/l44/ftx9349.bin - this is what I
started with
ftp://diy-efi.org/pub/gmecm/bin_lib/1226869/l44/fty9355.bin - this is the
manual trans version.





----- Original Message ----- 
From: <davesnothereman at netscape.net>
To: <gmecm at diy-efi.org>
Sent: Saturday, March 25, 2006 1:27 PM
Subject: Re: [Gmecm] Torque converter clutch on 1226869


> How many of the calibration locations are called out in your tuning
> software?  80%?  90%?  You might try making a list of all known
> locations.  Then when you try to read the rom dump, you might be able
> to locate the wastegate control sections easier.  You said wastegate
> duty cycle is viewable on the scantool, correct?  And that's what
> you're using to test wastegate operation?
>
> Looks like the original 125 trans placed the tcc solenoid in series
> with a 3rd gear switch.  There's no high gear input for the ecm.  TCC
> is connected to pin A7 in the schematic I' m looking at.  Looks like a
> shift light, if used, is connected to pin A2.  You're sure you're using
> the auto trans calibration, correct?  Might try connecting your test
> light to A2 to confirm that output isn't active instead.
>
> Is there a copy of yourt base calibration in the .bin library?
>
> Zaphod
>
>
>
>
>
> -----Original Message-----
> From: David Allen <davida1 at hiwaay.net>
> To: gmecm at diy-efi.org
> Sent: Fri, 24 Mar 2006 20:33:04 -0800
> Subject: Re: [Gmecm] Torque converter clutch on 1226869
>
>    I can adjust what appears to be everything pertaining to the
> wastegate.
> -desired boost Vs. %TPS
> -overboost fuel cutoff / resume
> -overboost spark retard
> -knock boost reduction
> -"boost mode" enable MAP
>
>  I've tried to put in numbers WAY lower than the boost this engine runs
> (which should make it give nearly a 100% duty cycle). But nothing
> happens.
> I do have a "rom dump" from Ludis' site which I will run through a
> disassembler.  But I have no experience in Motorola assembler so it may
> be
> of little use. (While I have done a fair amount of programming,
> including
> controller applications; it has been in high-level languages.)
>    Ludis has some info but nothing I hadn't already seen. I got the ROM
> dump
> there.
>    A commented disassembly on this ECM would be the best (like you said)
> but
> I have yet to find one.
> David
>
>
> > If you don't have a complete disassembly, then you're probably at a
> > real disadvantage as far as the wastegate.  Can you adjust the
> > wastegate control enable paramaters?  Temp, TPS, boost, rpm?  Are they
> > even adjustable?
> >
> > Boy, you are really right about a lack of calibrations.  Looks like
> > two:  FTX and FTY.  Anything on Ludis' site?
> >
> > Zaphod
>
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