anti-theft chips ?

[Programmer]

I'd think that any type of anti-theft system may be a hodge-podge in an
emergency...
I'm not much of a software compiler guy, Dave. Been years since I wrote
basic <G>...if I wanted to do this in
a 7747 bin--how'd I do it ?? I know somebody wrote code to
put a speed limiter in a 7747 bin--and it works great. If it's shown
to me once...I'm a quick learner. I've seen this before somewhere in my
internet travels, but can't remember where. Somebody mentioned a
"secret start" sequence -- maybe it was at the GN site, I dunno. I'm not
sure
if this would work but, how'd you write:
1. If Key on
2. If TPS + 70% or A/C signal high, or .... PRNDL in R_DL once
3. Then fuel on ??
Will the PCM see this as a one time event at start up--it should I guess?
If you don't have time help--no problem...I'll try to figure something out.

Lyndon.

-----Original Message-----
From: Dave Zug. <dzug at delanet.com>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: October 5, 2000 7:58 AM
Subject: Re: anti-theft chips ?


>in '97 or so, I patched in code (manually - no compiler) after the checksum
>to check TPS and compare it with 50%. checksum occurs at key-on and not
>otherwise (from what I could find - no other calls to the start of the
code)
>based on the comparison I would select 1 of 2 spark tables when it came
time
>to do the 3d lookup. I suppose if you either put the execution into an
>endless loop if TPS is not above 50% when the key is turned on. Interrupts
>may override this though. I made a lengthy post regarding exactly what I
did
>maybe a year ago. another consideration is liability of coarse.  If the car
>must be started in a panic, or BORROWED in an emergency it could gum things
>up. If an accident occurs it will take high paid experts to testify that
>there is no way your patch was responsible.
>
>DISCLAIMER - DO THIS ONLY ON A TEST BENCH, for fun  ;-)
>
>EFI performance made a security version for their GN chips that required a
>sequence of activities, something like key, neutral, park, TPS, crank.
>
>
>
>----- Original Message -----
>From: Programmer <nwester at eidnet.org>
>To: <gmecm at diy-efi.org>
>Sent: Thursday, October 05, 2000 2:35 AM
>Subject: anti-theft chips ?
>
>
>> Anyone ever figure how to write a secret start sequence so
>> one wouldn't have to shell out big bucks for an anti-theft
>> system that is so easily bypassed ? My secretarys' husband
>> had their 89 C1500 SWB stolen right from in front of their house.
>> They heard the truck start up and drive away--thought it was a
>> neighbor <g>. That was last week--got the truck back today,
>> luckily--the idiot that stole it was caught driving drunk...otherwise
>> they probably wouldn't have had any action on it at all...
>> Lyndon.
>>
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