I do I do!!!!!!!!!!!! I Have some 555ic in sm
Robert
J Forbes wrote:
>> Here is a question for all of you electronic gurus on the list: I
>> have removed the steering
>> column from a 1993 Buick LeSabre and plan on installing it in my 54
>> 3100. I will also install
>> a 1985 TPI 305. Can the 1985 ECM be programmed to take advantage of
>> the "chip" in the key
>> on the column for security? Is this more trouble than it is worth?
>> I plan on using this as
>> a daily driver and would like to be as secure as possible.
>
>
> I'm not sure how the Buick system works, but I have some experience
> with the 90-92 F body VATS setup. The chip in the key is just a
> resistor. The value of the resistor varies, so you have to have the
> correct resistance to activate the system. But it works in a strange
> way...the resistor is used in an oscilator circuit in the VATS module,
> which puts out a square wave with a frequency that depends on the key
> used. If the correct key is used, the signal is at 30 Hertz, and the
> engine computer will accept this as a "good" signal and keep the
> engine running. If the wrong key is used, or no key is used, the
> signal will be "bad" and the engine will stop after a few seconds
> (injectors shut off).
>
> So...if the 85 ECM does not have the VATS feature, then no, it won't
> work. But you migth be able to use a newer speed density computer
> (1227730) with the appropriate prom and wiring (and VATS module) and
> make it work. The folks who reprogram ECM proms can disable the VATS
> input, so the car will run with no VATS signal. A cheap fix is to
> make your own square wave generator using a few cheap electronics part
> (NE555 timer) and make your own VATS module, which can use no key or
> whatever key you want.
>
> Survey: who understood what I just said?
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