[Gmecm] How does the ecm "know" if it is an auto or manual trans ?

[davesnothereman at netscape.net]

 This is the case with most manual vs automatic trans calibrations.
 
Zaphod
 
 
-----Original Message-----
From: robert.sjodin at scania.com
To: gmecm at diy-efi.org
Sent: Wed, 6 Sep 2006 9:58 AM
Subject: RE: [Gmecm] How does the ecm "know" if it is an auto or manual trans ?


Perhaps the $58 is different but in my case ($8D) there are quite a few tables 
and constants that will differ. Eg compare main SA table for low RPM and high 
MAP you will see that auto has much more spark advance due to converter. 

My Corvette came with an ANHT-based (auto) "custom" chip but it should have been 
AXCN (manual). When I started to compare those two I found that several hundred 
bytes calibration data were different.

I would be surprised if it was only one bit differece between auto and manual 
gearbox for the $58 since there are so may differences in case of the $8D.

Rob
 

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf Of 
Bill - Comcast
Sent: den 6 september 2006 13:37
To: gmecm at diy-efi.org
Subject: Re: [Gmecm] How does the ecm "know" if it is an auto or manual trans ?


In addition,  both Tunercat and Promgrammer let you edit this bit.

Bill

DV Fagan wrote:
> Phillip,
> There is a single bit within the first ten bytes of
> the PROM which specifies manual or auto.  Look at the disassemblies of 
> your code set to find it. Dennis
>
> --- Phillip Kuhn <pmkls1 at yahoo.com> wrote:
>
>   
>> I am curious about this as I dont see anywhere in
>> the
>> editing software to program for an auto or manual
>> trans. I plan on using a $58 code in my 240sx and
>> the
>> bin I downloaded is for a sy/ty which of course were
>> all autos. I still have yet to see anywhere at all
>> to
>> "tell" the computer what type of trans the vehicle
>> has. I thought I knew a lot about GM cars and how
>> they
>> worked as I was a GM tech for 6 years but lately I
>> have found that my knowledge was a lot more limited
>> than I thought. Of course over the last 6 years most
>> of the ecm's used for ecm conversions have long been obsolete but I 
>> have still been under the hood of plenty older cars. Anyhow if 
>> somebody could answer that question for me I would greatly appreciate 
>> it. Thanks,
>>
>> Phil
>>
>> _______________________________________________
>>     

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