Subject	Speed signal is a pulse.
Posted by	chromaone on February 27, 2009 at 2:51 PM
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In Reply To	HICAS Manipulation. posted by scottyfender on February 26, 2009 at 06:00 PM
Message	From the Service Manual ST-90 HICAS Diagnoses for testing the speed signal: "Measure voltage variations between control unit connector terminals 6 and 24 while slowly rotating the rear wheels by hand. Voltage must change between 0 and 5V." The same speed signal is routed to other controllers - power steering, ECU, etc. Too fool HICAS into thinking the speed is whatever you want, you need a variable frequency TTL (0-5V) oscillator connected to the HICAS controller speed sensor input only. Can be built with a few dollars of parts. You'd want to borrow a frequency counter to measure what frequencies from the existing signal correspond to what speed of the car.
Follow Ups	HICAS Manipulation. - scottyfender 18:00:34 02/26/09 Re: HICAS Manipulation. - njz 20:06:55 02/26/09 I'm not sure either...anyone know positively? (n/m) - scottyfender 20:26:11 02/26/09 Greg @SpecialtyZ - Zoomin 23:00:46 02/26/09 keep us posted on your findings. (n/m) - zachttu (Austin) 09:07:50 02/27/09 Interesting idea. My biggest concern would be w/undesireable - Dave N 11:22:48 02/27/09 Speed signal is a pulse. - chromaone 14:51:38 02/27/09 I see an accident happening (n/m) - njz 19:49:51 02/27/09 Nahhhh - scottyfender 16:43:28 02/28/09 Re: HICAS Manipulation. - WazTTed 21:53:16 02/27/09
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