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Speedometer/Odometer Quit

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Both the speedometer and odometer on our '94 5sp. stopped functioning. Although it seems electrical, I see no fuse/circuit beaker that controls these. Thoughts please. Thank you!
 
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This same thing just happened to my '92 manual over the weekend during the Mideast NSX Meet in Raleigh.
Starts wigging out after about an hour and a half of driving/cruising on the highway. But works fine in the morning/next day after things have cooled off.

VSS for sure.
 
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Almost certainly the VSS on the top of the transmission. Can be replaced fairly easily after gaining some room to work from the top by removing the airbox.

The VSS internal potting seems to melt into a smelly mess and makes it sensitive to temperature, so when the car is hot the VSS starts acting up and then works again after cooling down. You can get a very cheap Chinesium aftermarket VSS from Amazon/etc. that has the same fitment and will work perfectly fine at <1/10 the price of OEM.
 
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i had this wiggle of the speedo a few months ago. now my odo works but my speedo doesnt. doesnt bother me much as ive gotten really good at judging speed based on RPM in 5th gear
 
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i had this wiggle of the speedo a few months ago. now my odo works but my speedo doesnt. doesnt bother me much as ive gotten really good at judging speed based on RPM in 5th gear

If the odometer works; but, the speedometer doesn't the problem is not the VSS. The bad news is the problem may be in the speedometer drive circuit which may be an indication of failing capacitors. Failing capacitors may result in permanent damage to the circuit board and create other problems in the cluster. There has been at least one report of a fire in an NSX resulting from a short circuit in the cluster. If your NSX is an early car and has always been in a hot climate (capacitor lifespan is a function of temperature), you may want to consider removing and inspecting the cluster for damage.

That is a lot of 'mays' in the warning so you need to assess your risk tolerance.
 
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VSS is the vehicle speed sensor, called VSS1 in manuals. Look on page 23-133 in the 1991 service manual. It sits on top of the transmission casing above where the drive axles are. You can see it from above with a flashlight but need to remove the airbox or other components to gain enough room to remove the 2 bolts holding it on.

You can use https://www.amazon.com/gp/product/B01FAAL7R4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 (or part # 78410-SV4-003) as a cheap replacement, both versions with and without a wiring pigtail included will fit to the stock wiring harness but might be tight depending on your model year. The little peg in the pics ("joint shaft" in the manual) needs to be inserted between the sensor head and the transmission for it to work, the new sensor comes with a new "joint shaft" but you can reuse the old one too.

If you're curious you can take the top 3 screws off the old sensor head and look inside, I'm betting the electrical potting is messed up and smells like burnt plastic.
 
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Any idea where I can send my cluster to be looked at and repaired? Nsxe repair website looks like it's under construction
[MENTION=8372]yellow[/MENTION]Scorpian your cluster needs to be rebuilt, there is no doubt. Do it now before it gets worse. It can actually start a fire in your car...you're also going to get good at emptying your wallet

http://www.nsxprime.com/forum/showt...dometer-not-functioning?p=2032940#post2032940

http://www.nsxcb.co.uk/showthread.php?15679-gauge-cluster-fire-issues
 
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[MENTION=7588]Briank[/MENTION] appears to be updating his 90's site, too bad, I like business only CL style sites.

You should start with BrianK because he is local, does great work, and has a long track record of quality. Next would be Heineken, but shipping to the EU is long and expensive. And, finally, T3TEC, and everything will just be overly expensive.
 
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Considering the circuit, most likely the case but is the Trip meter also not working?


CEL triggered?
If VSS completely fails, it will trigger the CEL.
However, intermittent or non-open/short circuit status won't trigger it.
You won't be able to activate the VTEC if ECU thinks that you are in neutral or less than 5kph/3mph.


Does the Cruise Control still work?
Multiple inputs and conditions so doesn't necessarily tell the VSS failure but at least, you can check.


94 MT so unless you opted for the EPS, you won't trigger the EPS light with the VSS failure.


If you have handheld oscilloscope or even a multimeter, you can do a quick check.

If VSS is fine, time to refurbish your gauge cluster.


Kaz
 
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If you have handheld oscilloscope or even a multimeter, you can do a quick check.

If VSS is fine, time to refurbish your gauge cluster.

Kaz

O-scope! That is some serious stuff!

I will admit to having 2 or 3, but I use them so infrequently it takes me longer to remember how to get it working than using!

Problems of having cool tools!
 
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O-scope! That is some serious stuff!

I will admit to having 2 or 3, but I use them so infrequently it takes me longer to remember how to get it working than using!

Problems of having cool tools!

Indeed, modern DSOs with three deep levels on the menu for each control panel button plus so much select-ability in the sampling and triggering set-up that you can turn it into a brick or something that gives you totally weird results. Now where did I store that .pdf of the 600 page user's manual?

I keep my old analog scope around as a sanity check when I manage to set up the scope in some totally weird manner. I have had to use the default to factory settings feature a couple of times.
 
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I'm on it!

Dragged out my giant 'NSX Service Manual 1993' 23-133 now and having a look. Thank you!

VSS is the vehicle speed sensor, called VSS1 in manuals. Look on page 23-133 in the 1991 service manual. It sits on top of the transmission casing above where the drive axles are. You can see it from above with a flashlight but need to remove the airbox or other components to gain enough room to remove the 2 bolts holding it on.

You can use https://www.amazon.com/gp/product/B01FAAL7R4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 (or part # 78410-SV4-003) as a cheap replacement, both versions with and without a wiring pigtail included will fit to the stock wiring harness but might be tight depending on your model year. The little peg in the pics ("joint shaft" in the manual) needs to be inserted between the sensor head and the transmission for it to work, the new sensor comes with a new "joint shaft" but you can reuse the old one too.

If you're curious you can take the top 3 screws off the old sensor head and look inside, I'm betting the electrical potting is messed up and smells like burnt plastic.
 
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This just happened to me. I would get a check engine light, and the car would not let me WOT pass a certain RPM. I ordered the VSS and planning to install it this weekend.
 
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