GM ECM: Vats

[peter paul fenske]

>>>have one of 15 resistance values. When five volts is 
>>>applied to that resistor one of fifteen voltage values results
>
>I beg to differ my good man. While installing the '89 350 TPI into my '58, I
>had to crack the VATS enigma.  What I found out was that the resistor in the
>key provided a voltage to the VATS module. The VATS module would then send
>about a 30hz signal to the ecm to say "a-okay". The ecm would then allow the
>injectors to fire. 
>>>The older ones
>>>used a separate VATS module which makes life easier.
>
>No info on the newer units. I was told they use a 40hz signal with a module.
>
>
>Good luck, and keep us informed.
>
>GMD
>
>Hi George
>Tnx for info:
>I am very sure you are right for 89 90. However I will do some
>investigating for newer models. My gm parts book stops listing a
>module for 90 later. Of course this doesn't mean any vats module
>GM might not be selling it.
>Curious I am as to why you simply didn't use module and resistor.
>I guess it wouldn't be very neat in a classic. The modules that
>Ecklers and others sell are quite tacky.
>Well I will be facing this when I help my friend install
>the new LT1 in his four runner. I hope he got everything as I told
>him to do.
>My test setup will probably use a older tpi but I suppose
>I can play with different ECMs as I am amasing quite a collection.
>Will keep you informed.
>Tnx again George:
>:peter
>