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  #1  
Old August 28th, 2016, 07:48 PM
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Bill Campbell
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VDO Speedo

So I have a VDO speedo with a hall effect sensor wired up on my 1994 d90. Should the speedo show some speed even if inaccurate before I program it or will it not move at all?

Currently, the needle doesnt move at all on the short test (like a few blocks) drives I have done.
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  #2  
Old August 28th, 2016, 08:29 PM
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John B.
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Yes it should always show some speed if wired correctly and working.
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  #3  
Old August 28th, 2016, 08:45 PM
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Bill Campbell
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I was afraid of that. I checked the wiring against the instructions and it looks right. I guess it's time to check the cable connections. I mean they seem pretty foolproof but I am quite the fool sometimes.
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Old August 29th, 2016, 01:53 AM
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I've found that wiring is one of those things that I either get or don't. I often stare and think about the thing for a long time, then it just 'clicks' and makes perfect sense.

You'll figure it out.

But have you found the PDF instructions for that exact model number? I have seen that some of the VDO instructions I find seem right at first, but may have an updated version, or might be for a slightly different model.

Also, always check the ground first and again. For some reason, that always seems to be the most common thing wrong. Even when it seemed to have just been right.
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  #5  
Old August 29th, 2016, 12:47 PM
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Bill Campbell
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Ya it's wired correctly. I have triple checked it. I get power to show the Odometer at Zero, and the needle jumps just a bit when I turn the key on. Also the gauge lights work when the headlights are clicked on. Next is to see if spinning the hall effect sensor manually actually makes the needle move. If that works then it is in the cable somewhere.

Of course with the tach I followed the instructions explicitly and having the dip switches in the correct order according to the directions (for a V8) didn't work. I had to shut them all off and then it registered reasonably close.

So...I don't know. I don't really need a Speedo other than to pass inspection. I am usually a right lane stay with the flow of traffic kind of guy.
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Old August 29th, 2016, 12:59 PM
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Quote:
Originally Posted by wcampbel@nas.edu View Post
...then it is in the cable somewhere.
I assume by that statement you are not using the stock Defender TD5 hall effect sender that mounts to the transfer case? What have you installed?

Does the V8 not already have a vehicle speed sensor for the EFI? All you need to do it tap into that signal. There is no need for a separate sender.
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  #7  
Old August 29th, 2016, 02:11 PM
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Quote:
Originally Posted by wcampbel@nas.edu View Post
So I have a VDO speedo with a hall effect sensor wired up on my 1994 d90. Should the speedo show some speed even if inaccurate before I program it or will it not move at all?

Currently, the needle doesnt move at all on the short test (like a few blocks) drives I have done.
New speedo will show no speed until programming is complete
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  #8  
Old August 29th, 2016, 02:16 PM
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Bill Campbell
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Quote:
Originally Posted by Red90 View Post
I assume by that statement you are not using the stock Defender TD5 hall effect sender that mounts to the transfer case? What have you installed?

Does the V8 not already have a vehicle speed sensor for the EFI? All you need to do it tap into that signal. There is no need for a separate sender.
1994 NAS 90, so no VSS I believe. It was a mechanical speedo previously. So I went CJ-7 speedo cable from transmission to the the hall effect sensor (I believe I bought the hall effect sensor from VDO or GM can't remember) and wired that per VDO speedo instructions.

I followed Hans advice back when his speedo page was up. It's 404 now. http://www.defendersource.com/forum/...tml#post229863

Just took me a while to get my ass in gear and get my truck up and running.
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  #9  
Old August 29th, 2016, 02:27 PM
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Quote:
Originally Posted by wcampbel@nas.edu View Post
1994 NAS 90, so no VSS I believe.
AFAIK, you should have one. A box inline with the speedo cable. You can just use that signal. I'm not sure why people have been adding a second sender.
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  #10  
Old August 29th, 2016, 02:28 PM
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Originally Posted by Mybluett View Post
New speedo will show no speed until programming is complete
In the ones I've installed, it read right away. If this is the case, then go and run a quick calibration and see if it comes to life.
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  #11  
Old August 29th, 2016, 02:41 PM
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Programming (off the top of my head) is:

Ignition off
Push and hold button while powering up speedo (key to power position or run)
Hold until AUTO or AUTOCAL appears (3-5 seconds)
Release and it will show "button" (or release and press again until "button" appears)
push and release button - drive exactly one mile and push button again
speedo will calculate a RPM (revolutions per mile) number on the display and then it will start recording mileage and speed

Hope this helps I've put a half dozen or so in this year already...
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  #12  
Old August 29th, 2016, 02:41 PM
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Bill Campbell
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Originally Posted by Red90 View Post
In the ones I've installed, it read right away. If this is the case, then go and run a quick calibration and see if it comes to life.
Ya I am going to go take it for a spin tomorrow night (it currently doesn't live at my house #45andstillkeepsstuffatparentshouse) and see if I can get it moving.

And thanks for the info, Mybluett. Definitely helps.
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  #13  
Old September 4th, 2016, 07:54 PM
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Bill Campbell
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Quote:
Originally Posted by Mybluett View Post
Programming (off the top of my head) is: Ignition off Push and hold button while powering up speedo (key to power position or run) Hold until AUTO or AUTOCAL appears (3-5 seconds) Release and it will show "button" (or release and press again until "button" appears) push and release button - drive exactly one mile and push button again speedo will calculate a RPM (revolutions per mile) number on the display and then it will start recording mileage and speed Hope this helps I've put a half dozen or so in this year already...
Yep this worked perfectly. Thanks again. As soons as it calibrated the needle jumped roght up and started working.
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  #14  
Old September 6th, 2016, 12:44 PM
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Quote:
Originally Posted by wcampbel@nas.edu View Post
Yep this worked perfectly. Thanks again. As soons as it calibrated the needle jumped roght up and started working.
Glad to help - and glad I remembered correctly!
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