Re: Replacing the Speedometer - Saab 900 Bulletin Board - Saabnet.com
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Re: Replacing the Speedometer
Posted by Simon S (more from Simon S) on Wed, 30 Mar 2016 11:13:36
In Reply to: Re: Replacing the Speedometer, Justin VanAbrahams [Profile/Gallery]
, Tue, 29 Mar 2016 11:03:25
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yeh, we both made some doosies...I'm way off on what I was thinking for the VSS sensor output...
your measurements actually show a pulse per rotation is in the range of 16:1?
So, lets back this up a bit....
I thought to look in a Trionic 5 binary, and found a defined pulse-per-wheel-revolution of 48.
I also thought to look in my wiring diagrams, and realized the frequency output of that VSS is groomed by the Speedometer instrument. The square wave the ECU expects is output of the speedometer cluster itself, probably akin to the speed output the cruise uses in the c900 cable speedo unit. The fact that the T5 expected input comes from the instrument cluster and not the VSS, means this prior information is completely useless to you >.<
posted by 76.105.241...
Posts in this Thread:
- Replacing the Speedometer, Justin VanAbrahams , Mon, 28 Mar 2016 14:32:33
- Let's start again, with new info!, Justin VanAbrahams , Thu, 31 Mar 2016 15:56:00
- Re: Let's start again, with new info!, Roger D , Thu, 7 Apr 2016 08:51:26
- Re: 9000 VSS axle ratio, Simon S, Sat, 2 Apr 2016 13:51:39
- Re: Let's start again, with new info!, Justin VanAbrahams , Fri, 1 Apr 2016 09:36:58
- Re: Replacing the Speedometer, Simon S, Mon, 28 Mar 2016 16:03:22
- Maybe..., Justin VanAbrahams , Mon, 28 Mar 2016 14:35:45
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