speedometer not working? - Page 2 - Nissan Forum
B14 95-99 chassis 1995-1999 Sentra and 1995-1998 200SX

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post #16 of 33 Old Aug 25th, 2012, 11:09 PM
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If you order the speedometer head through Nissan, they will pre-program the mileage for so your odometer will read the correct mileage (+/- a few miles, depending upon how much you drive it between ordering the part and installing it).

You cannot bypass the speedometer head and go directly to the ECM. The speed sensor generates and AC voltage signal to the head unit and the head unit converts it and sends a signal to the ECM.
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post #17 of 33 Old Aug 29th, 2012, 05:47 PM
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Originally Posted by smj999smj View Post
If you order the speedometer head through Nissan, they will pre-program the mileage for so your odometer will read the correct mileage (+/- a few miles, depending upon how much you drive it between ordering the part and installing it).

You cannot bypass the speedometer head and go directly to the ECM. The speed sensor generates and AC voltage signal to the head unit and the head unit converts it and sends a signal to the ECM.
yes, i realize that. But it is surprising to me, since aftermarket ECMs can take hall effect sensor signals directly. Nissan could have used the raw signal, i believe, if they calibrated the ECM to receive it, but they chose to put their effort into conditioning the signal with the gauge instead.

I guess in asking that, I was hoping for a bit more technical discussion than "The speed sensor generates an AC voltage signal to the head unit and the head unit converts it and sends a signal to the ECM."

1997 Sentra GXE, GA16DE, M/T
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post #18 of 33 Old Aug 29th, 2012, 06:18 PM
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I guess they could have...but that's the way they did. There are a lot of times I wonder why auto engineers didn't do something differently. Personally, I don't really see a need to re-engineer something as simple as a faulty speedo head. A lot easier to just order a new one and install it....but maybe that's just me!
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post #19 of 33 Old Aug 29th, 2012, 08:45 PM
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haha, i guess easy wasn't really what I was going for. I was going for interesting, yet inexpensive. mostly driven by the inexpensive factor. But then again, buying a new car altogether would usually be easier.

1997 Sentra GXE, GA16DE, M/T
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post #20 of 33 Old Nov 17th, 2012, 12:38 PM
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I had the same issue with my 95 200sx. All i had to do was reflow the solder on the Spedo connection points on the board about a 5 min fix
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post #21 of 33 Old Dec 6th, 2012, 08:35 PM
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I had the same issue with my 95 200sx. All i had to do was reflow the solder on the Spedo connection points on the board about a 5 min fix
by Speedo connection points, you're referring to where the mounting screw holes interface with the circuit board? did you just melt solder and drip it into the threaded hole? It's been a few months since i last saw it, but there didn't look to be anything easily reachable with a soldering iron where there might be a cracked/brittle connection.

Please, can you describe in a little more detail where you applied your solder?

1997 Sentra GXE, GA16DE, M/T
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post #22 of 33 Old Dec 6th, 2012, 09:14 PM
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its been a while since i last looked at it so the details are a little fuzzy. but from what i can remember there are like 3 flat pieces of metal that comes though board that are solder to the board and you could see cracks on them. i re-flowed them and added some solder to them to make it nice and solid i would almost have to pull it out and describe it or try and find a picture of it.
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post #23 of 33 Old Dec 6th, 2012, 09:20 PM
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okay sorry for the second post i just looked a pic up. you have to take all the screws out then separate the front and the back to where you can get to the spedo it self. there is the part i had to solder, should be a board right on the back of it that the part screw into. you can follow the traces from the screws to the points where they need to be soldered
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post #24 of 33 Old Dec 7th, 2012, 06:33 PM
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okay sorry for the second post i just looked a pic up. you have to take all the screws out then separate the front and the back to where you can get to the spedo it self. there is the part i had to solder, should be a board right on the back of it that the part screw into. you can follow the traces from the screws to the points where they need to be soldered
ok. My speedo has fits for a while, then i go several months with no problems, then it happens all the time.

Since it's in and not being problematic, I'm going to not mess with it, but when it starts being problematic again (which it will) I will reference this thread, search for what you described, solder it, and share my results.

Thanks for the info.

1997 Sentra GXE, GA16DE, M/T
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post #25 of 33 Old Mar 19th, 2013, 09:21 PM
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here we go again....

Ok folks, it happened again. After a 6-month reprieve, my speedo is back to its usual antics. Following the suggestions posted by tomraedisk, Here's what I did.

Here's my speedometer


I first tried to separate the circuitboard as follows, but soon realized there are 4 soldered pins that are holding it down.


Here are the pins. The must be desoldered. without a solder vacuum, it's tricky,

finally got it off. Those 4 flat pieces are the pieces that tomraedisk was talking about.


I reflowed the solder and added some more to make sure there was a solid connection. It didn't look like there was any cracking at all--every solder point looks very good.




Here's to hoping it's fixed. Only a drive (or several) will truly tell. If it's not fixed after this, then I don't know what else to do except buy one from a dealership, which I've very strongly been resisting.

1997 Sentra GXE, GA16DE, M/T
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post #26 of 33 Old Mar 19th, 2013, 09:34 PM
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You went a bit further then i did. I could see very small hairline cracks in it. Would almost need a magnifier to see them clearly. I just heated up the solder to re-flow it and added some to it. I hope it works for you.
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post #27 of 33 Old Mar 19th, 2013, 11:32 PM
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I reflowed the solder and added some more to make sure there was a solid connection. It didn't look like there was any cracking at all--every solder point looks very good.
Just going to throw this out there, because soldering is "my bag"...has been for X number of years, all sorts of training, blah blah blah (this is the part where I get up on my high horse...but I'm afraid of heights )

More solder, or more correctly, a big ol' blob of good looking solder on a joint isn't necessarily a good thing.
The solder cools and hardens quickly on the outside, but the stuff on the inside is still hot and liquid, and unknown to you, or anybody else without an X-ray machine (or whatever high tech equipment you wanna throw in there), the liquid stuff left over on the inside cools and contracts more slowly, ends up basically crumbling, and eventually, you end up where you were.

Best bet...suck the old solder off, wick it, vacuum it, shake it, whatever, put new solder on, just enough, not too much, etc.etc.etc...

99% of the questions that are "STRANGE" have a dirt simple answer...usually answered by a dirt simple search.

NISSAN GOOGLE

Is it just me, or does the majority overlook the obvious?

Somebody ate a whole bag of dumbass for breakfast.

Why do people continue to run a vehicle when a warning light comes on or starts flashing? Isn't that a clue that something is wrong and you probably should NOT drive it?
Is this whole car driving thing really freekin' brain surgery?

Here's something new for the crowd/clowns...
"A little bit of Google goes a long way!"

Ever notice the one post wonders for info on turbo'ing a GA16 are never heard from again after they figure out the cost???

And if you can read this, you don't need glasses! :)

And yes, I am diggin' it...
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post #28 of 33 Old Apr 12th, 2014, 07:03 AM
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I'm having the same issue with my 91 Infiniti. The board is a little different. I was thinking that tightening the screws that join the Blue and Green circles may help based on smj999smj post.

I circled the points where the speedo head links in the board which is where I'm guessing needs to be resoldered.

Could this be a possibility with the 1991 Infiniti M30 too?

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post #29 of 33 Old Apr 12th, 2014, 03:10 PM
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It's definitely worth a shot!

Since Infiniti is Nissan's luxury brand, it makes sense that our Nissans are set up very similarly to how yours was several years earlier. The speedo unit is probably the same or similar, meaning the fix could be the same
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post #30 of 33 Old Jul 15th, 2014, 06:09 AM
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Hi I have a Nissan pulsar 1998 and I connected the battery the wrong way around, and now I have no wipers and speedo, indercators ect. I've checked the fuses and there all good, what could it be,
Regards
Simon
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