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Speed Sensor?
Gonna hook up a GPS unit, and I need to get the vehicle speed sensor. I presume it's available at the ECU since the PowerFC gets it, but can anybody tell me which wire? And if it's a sine or square wave? Thanks!
~Tom |
http://www.scuderiaciriani.com/
its on that site somewheres..tried looking real quick with no luck..but ive seen it |
Hmm, I couldn't find it on there and the search engine seems to be broken.
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The auto->manual conversion guys dug through that stuff a while back. See if anything in there can help you out:
https://www.rx7club.com/forum/showth...4&pagenumber=3 |
There are two wires listed on that thread:
Green-speedo input (used) Orange- speedo input (used) anybody know which I should use? And what kind of signal it is? |
Any help here?
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The orange wire on the emissions harness to dash connector (X-14 in the shop manual) is the ground connection from the speedometer comparator circuit to the vehicle speed sender (VSS). The green wire is the signal wire (VSS output) back to the speedometer.
The X-14 connector is tucked up under the dash on the passenger's side, behind (if memory serves, it's been a little while) the A/C section of the underdash crap. Be advised that it's a royal pain in the ass to get to. :) Here's a little more information I posted in another thread... The VSS sends out 8 AC pulses per driven gear rotation, according to my "service highlights" manual, and the analog speedometer is driven by a comparator circuit. The comparator receives the pulses which turn it on and off, and the computing element determines the amount of current to send to the cross coils based on the count. The current in the coils creates a magnetic field, moving the needle on the analog speedometer, indicating speed. The U.S. speedometers are calibrated to ~8,200 pulses per minute @ 60 mph, and I suspect the Japanese (and Canadian, UK, and Aus) speedometers are also, or the equivalent in kph (96 kph), at any rate. Since the calibration shown for 100 kph (Canadian speedometers) is listed as ~8,490 pulses per minute, which is equivalent to ~62.5 mph/~8,500 ppm, that's the same as 60 mph/~8,200 ppm, which would indicate a standard VSS output for all cars. |
Which of these wires would I need to properly connect my Blitz PowerMeter iD? I searched and read the instructions that came with it but I haven't came up with much yet.
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The green wire is the "signal" wire to the speedometer. Any device requiring the output of the VSS needs to be connected to the green wire.
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Sounds like a sine wave, if the speedometer is analog. Is that right Jim? Thanks, as always you're my ray of hope in an otherwise gloomy mess of wires :)
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Just a heads up for anybody looking for this sensor wire, an easier place to tap it is behind the guage cluster. I couldn't find X-14, so I began tracing wires with the Electrical Service Manual. The easiest place to access the signal is on the connector that is nearly dead center on the cluster. The wire color is Yellow/Red.
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Originally posted by Hyperite Sounds like a sine wave, if the speedometer is analog. Is that right Jim? Thanks, as always you're my ray of hope in an otherwise gloomy mess of wires :) |
Where is this green wire?
Is it on the ECU? Raj |
2 Attachment(s)
Location of plug X-14 is under the dash on the passenger's side, behind the heater/air conditioning, on the firewall.
https://www.rx7club.com/attachment.p...id=92409&stc=1 Plug X-14 wiring schematic. https://www.rx7club.com/attachment.p...id=92410&stc=1 Below are the descriptions for the highlighted wires, and the shop manual pages (1995) that they appear on. O - Orange Page: Z-42 Description: VSS, ground G - Green Page: Z-42 Description: VSS, signal Y/R - Yellow/red stripe Page: Z-64 Description: Switched 12V+, from back-up light switch G/Y - Green/yellow stripe Page: Z-64 Description: 12V+ (15A - METER), to back-up light switch Y/W - Yellow/white stripe Page: Z-42 Description: Water temperature sender |
Thanks Jim!
Trying to get my GPS as accurate as possible. Raj |
Bringing back an old thread. What's the difference between the X-14 green wire versus the 1M, Vehicle Speed Sensor, pin on the ECU? I never realized that my ECU wasn't getting a proper VSS signal till I got my digital dash. Although my first mistake is that I needed a HALL signal whereas the RX7 had VR.
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1 Attachment(s)
https://www.rx7club.com/attachment.p...1&d=1496372461
(G pin/wire color) goes to the X-14 connector (part of the EM-Emission harness) is coming directly from the speed sensor--this is the raw VR signal (analog). The B1-01 connector coming out of ECU (1M pin G/R wire color) goes to the X-07 connector (part of the F - Front harness) which is a signal that passes though the speedometer---I think this is also a VR signal (analog) as the FSM states the signal varies from 0-5V. There is this thing that might help covert the VR to Hall signal: VR to Hall Converter | VEMS US I'm not sure as this is beyond by circuits ability.:scratch: |
Ah I see. Thanks for clarifying. I think I'll tap the X14 plug then. I bought a VR conditioner board from Dual VR Conditioner Board V2.1. Hopefully this takes care of my Hall signal. Then I can finally put in my AEM CD-7. =)
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Bringing up an old thread... Does the vr board ever worked? As I am trying to get a speedo signal to my ic7 after taking out the stock dash.... Thanks
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