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Old 09-04-2016, 12:56 PM   #1
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Default Vehicle speed sensor question

Hello everyone, thanks in advance for your advice.
I replaced my speed sensor because my odometer and speedometer are not working. I got it from eBay to save a couple of bucks, when it arrived it looked brand new and identical to the one I removed from the truck.
So basically I unplugged the old one and plugged in the new one as fast as I could to prevent loss of transmission fluid, cleaned up and replaced the fluid I lost and took it for a spin... Nothing!!! Did I missed a step???
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Old 09-04-2016, 01:16 PM   #2
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check and clean the plug on the harness side of the vss, see if that helps.
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Old 09-04-2016, 01:18 PM   #3
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Could just be that the speedometer is bad.
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Old 09-04-2016, 05:22 PM   #4
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VSS connector is clean. I got me an OBDII from Harbor Freight, plugged it while the truck was running and and it seems like the sensor is not communicating a signal to the truck's computer, it shows 0mph when the truck is going like 50mph. I've been googling some images of speed sensors and some of them have some sort of a plastic gear attached to them... could it be that nine is missing that???
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Old 09-04-2016, 08:44 PM   #5
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It has to have a plastic gear on it to rotate
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Old 09-05-2016, 02:27 AM   #6
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Turning the gear by hand should cause movement on the speedometer.

Obviously, this requires more than 1 person, though.

Also, turning the gear should create a voltage across the terminals, I'm guessing in the range of 0 to 5 V DC. You could spin the gear and check for volts or apply volts to the upstream side to see if the speedometer reacts.

Pull up a Factory Service Manual for your truck to see what that voltage is supposed to be.
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Old 09-05-2016, 02:54 AM   #7
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Thanks for the advice, I did some more research and came across this at Nissanpartsdeals.com:

Speedometer pinion 32743-36F18
Speedometer ring lock 32744-35F00

Apparently I was supposed to install these two along with the sensor. I placed the order earlier today, I should be getting them in a couple of days. I'll keep y'all posted.
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Old 09-05-2016, 12:48 PM   #8
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The real question is where in the hell is the gear that was installed on the original speed sensor?
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Old 09-10-2016, 02:56 PM   #9
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Its working!!!
So I removed the speed sensor and let the transmission fluid drain, I shined some light into the tranny and there it was, the plastic gear was stuck between the wall and shaft (or whatever that's called) I used a wire to fish it out, attached the new plastic gear and lock to the sensor, refilled and done. Speedometer is working again and the code disappeared. I have some pictures of the gear, sensor and lock as well as part numbers if anyone needs them. I wanted to upload them to the forum buts its kinda hard from my cellphone. If you guys are members to some of the popular FB pages of hardbodies and D21 y'all see them there.
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