anti-theft chips ?

[Dave Zug]

It really depends on where you put the switch. I wanted to point out to
others who might read this that locking out the FP relay wont work.
interrupting the power or ground on the FP will.

----- Original Message -----
From: <timsiford at hushmail.com>
To: <gmecm at diy-efi.org>
Sent: Thursday, October 05, 2000 3:05 PM
Subject: Re: anti-theft chips ?


> Dave,
>
> "Under cranking the line from the FP relay is overridden by the oil
pressure
> switch and the car will fire right up (crank for 10-15 seconds)"
>
> I wired up a FP kill switch by taking the FP ground into a toggle switch.
>  Worked great when I had it installed (took it out some time ago).  Are
> you saying that its not suppose to work that way even though it worked
that
> way in my instance?  MORE DATA:  I had the kill switch installed when I
> replaced my fuel pump with the Walbro 255ltr/hr pump.  After replacing the
> pump it no longer worked.
>
> Tim
>
>
> At Thu, 5 Oct 2000 16:27:10 -0400, "Dave Zug." <dzug at delanet.com> wrote:
>
> >
> >Under cranking the line from the FP relay is overridden by the oil
pressure
> >switch and the car will fire right up (crank for 10-15 seconds). Chip
> >security is defeatable by (as said) tow truck or limp home.
> >
> >disconnect speedo = 0 mph.  again, pros will just tow it... amateurs
> >will
> >bash it up in frustration if they can't steal it.
> >
> >The address lines thingy is all over the archives.. many implementations.
> >lookup thumbwheel (is that copyrighted?).. read the areas related to
> >hot
> >switching if you really want to do a nice job... I beleive the archives
> >still leaves a little assumption that you know the basics.
> >
> >
> >
> >----- Original Message -----
> >From: <timsiford at hushmail.com>
> >To: <gmecm at diy-efi.org>
> >Sent: Thursday, October 05, 2000 12:39 PM
> >Subject: Re: anti-theft chips ?
> >
> >
> >> Here's a quick idea....
> >>
> >> We've been discussing programming two images onto a double size chip
> >and
> >> then using a SPDT switch to control which image we are using on
> >thirdgen.org
> >> (kudos to Tim Burgess!)....
> >> http://www.thirdgen.org/messageforum3/Forum10/HTML/000072.html
> >>
> >> Couldn't you just program one image to have a maximum speed of 0mph
> >and
> >> the other image to function normally?  Seems that easy in theory.
> >>
> >> Why even worry about all that anyhow?  You could just wire up a fuel
> >pump
> >> kill switch using the FP ground.
> >>
> >> Tim
> >>
> >>
> >> At Thu, 5 Oct 2000 12:02:39 -0600, "Programmer" <nwester at eidnet.org>
> >wrote:
> >>
> >> >
> >> >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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> >> >>>
> >> >>>
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