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tjpreul | VSS signal to CCM | ||
Elite Guru
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I have removed the factory ECM, and am installing a Fast XFI 2.0 controller. From the factory VSS I can hook into the the XFI controller. The question is the VSS output that was created by the factory ECM. In the red book page 8A-33-3 it says the ECM amplifies and converts the sine wave created by the VSS to a square wave and this is what is supplied to the CCM. I was thinking I could tie the output wire to the signal wire, but now it looks like I need a converter?
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Posted on: 2016/1/31 17:01
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bogus | Re: VSS signal to CCM | ||
Grand Imperial Pooh-Bah
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IIRC, the VSS generates an A/C signal.
This should be the ticket: http://www.dakotadigital.com/index.cf ... =287/mode=prod/prd126.htm |
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Posted on: 2016/1/31 18:12
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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Schrade | Re: VSS signal to CCM | ||
Elite Guru
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I had a SIMILAR problem converting to auto in my car.
MIGHT have the answer SOMEwhere in old posts / PC doc's, but hands are FULL ATM... I had a DD SGI-5, but it turned out NOT necessary.......................... edit: I'm SURE I have the answer here TJP; will dig by end of day here... |
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Posted on: 2016/1/31 19:58
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LT5, Marc Haibeck ECM module, AUTOMATIC!!! |
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Matatk | Re: VSS signal to CCM | ||
Webmaster
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I can't answer your question directly.
I found this related to the VSS signal: 1. The two-pulse (2000 pulses per mile) square wave (D.C current or direct current) used on all TBI engines thru 1992, all computer-controlled-carbureted engines, and on 1985-1989 TPI engines. 2. A four-pulse (4000 pulses per mile) sine-wave (A.C. current or alternating current) signal is required by the 1990-1993 TPI, 1992-1993 LT1 engines, and 1990-1993 Camaro 3.1/3.4 V6 engines. On 3rd Gen it is recommended to use a buffer box. This might be something to look into: http://www.thirdgen.org/forums/dfi-ec ... -fast-xfi-vss-wiring.html |
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Posted on: 2016/1/31 20:40
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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Schrade | Re: VSS signal to CCM | ||
Elite Guru
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I'm looking through Z boards where I wrote up VSS problem in my conversion. Other notes are in another computer...
Exactly what are you asking here TPJ? What is the problem? Can you post a schematic of what devices you have to tie together? |
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Posted on: 2016/2/1 2:47
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LT5, Marc Haibeck ECM module, AUTOMATIC!!! |
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tjpreul | Re: VSS signal to CCM | ||
Elite Guru
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Quote:
No real issue. I thought I could get away without a converter. By conecting the VSS signal wire and VSS output wire together, but found out the ECM converts the VSS signal then sends it to the CCM. I will get a converter to do this, so I will have a speedometer. The reason I thought I could get away with this is that the XFI accepts the VSS signal from the trans. |
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Posted on: 2016/2/1 3:31
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Schrade | Re: VSS signal to CCM | ||
Elite Guru
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Alright - I got the question; VSS signal INPUT, TO my tranny control module, FROM VSS, is adjustable.
The default setting is the correct value. I do not remember at the moment; I will pull it up tomorrow here. My TCM then gets the correct signal for ECM, TO CCM (or whatever the channel is). |
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Posted on: 2016/2/1 3:48
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LT5, Marc Haibeck ECM module, AUTOMATIC!!! |
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