[Gmecm] Torque converter clutch on 1226869

[davesnothereman at netscape.net]

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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