Dummy Sensors / Testing

[Mike Rolica]

Optical pickup on back of speedo works fine from car with cruz control. Or
you can fake it with a 555 timer and drive with a open collector to ground.
The ECM pulls high just like vats module.  I've tried it on my 89 tpi set up
broadcast code apyu 165 ECM:-)   These guy on this list are the best, been a
great help... and still are:0

Mike Rolica
EXT. 260
 :-)


	-----Original Message-----
	From:	Bob Valentine [SMTP:bob at tecmark.com]
	Sent:	Saturday, October 16, 1999 3:33 PM
	To:	gmecm at efi332.eng.ohio-state.edu
	Subject:	Re: Dummy Sensors / Testing

	I may be asking the obvious, but why not use a VSS which generates a
	2000ppm output, eliminating the buffer?

	I realize GM isn't known for logical actions, but still....  ;^>

	At 02:14 AM 10/16/99 -0800, you wrote:
	>> 4.  On a '89 Firebird TPI schematic I have, the VSS input ("Speed
Input")
	>> is shown going to a "VSS Buffer".  What's this?
	>
	>The "VSS Buffer" converts the 4000 ppm magnetic pickup signal into
an
	>open collector output at 2000 ppm.
	> 
	>Ludis Langens                               ludis (at) cruzers
(dot) com

	--> Bob Valentine
	--> bob at tecmark.com