My speedometer sometimes works and other times it doesn't. When it doesn't the odometer also stops recording. I suspect it is the speed sensor. You have given me some ideas for testing.
@@loluracing Finally got around to it. Don't drive it much. Did replace the sensor with OEM but that didn't do it. Got serious after driving at 80 mph in a curve and power steering became boosted and felt like I was on ice. Problem became intermittent. Very scary. Came across info that if speed sensor is not replaced soon after it fails then a part in gauge cluster,maybe a transducer?, can burn out and ECU gets erroneous info and it can effect the p.s. boost. Sent cluster to repair shop. Shop could not get part and had to buy used cluster to scavenge part. Cluster repair plus shipping 2 ways,$435. 1 yr warranty. Put in cluster today n drove for 50 miles,no issues.
@@johnmichaelkarma The clusters fail in these cars due to dry solder. Its very hard to see and is 99% of the time the cause for failing gauges. If just your speedometer fails and resoldering the joints on the gauges does not solve the issue its the speed sensor. I fixed my speedo and tach about a year ago because they were intermittent, just touched up all the solder that looked bad and they've worked flawlessly ever since. Cost me $0. I've done it for 4 other Z's clusters now. Super common issue. My speedo is now going out and I have an automatic transmission, but this time its shifting is extremely erratic when the speedo stops working. It wont change gears or gets stuck in certain gears, wants to be in 1st while going 60 but cant because of the tach speed. This case is certainly a speed sensor issue. Just figure I should write this here for anyone whos having intermittent tach and speedometer issues; if you know how to solder just take your cluster out, disassemble it (it just has snap tabs and some screws holding it together) carefully remove the gauges, then resolder everything that looks old/cracked/damaged then reassemble. I guarantee it'll solve the issue. Also important to take a close look at the windings on the posts for the gauge needle. They have a hair thin wire thats soldered to the post and if the solder there is damaged it will need to be resoldered EXTREMELY carefully, more rare but potential issue.
Hello, I know this video is old, but I have a question if you’re able to answer. The sensor to the left of the speed sensor in your thumbnail. I got under the 93 z32 I recently purchased and found that sensor ziptied out of the way toward the rear of the transmission. Is that the turbine revolution sensor that is supposed to be located up toward the front of the transmission at the top? I haven’t been able to pull the exhaust off yet to be able to access the top of the transmission and was wondering if that’s where it’s supposed to be. Thanks in advance.
Wow encyclopedia man my respects to you tanks for the video I have my car is going 165 mph in the drive way 😢 hopefully I am trying to fix with your video my is automatic 🙏🏾😃
Just came across this video and great info on the speed sensor test, nice detailed presentation. Question I have a 1992 300zx NA manual 2 + 0 and the OEM speed sensor 25911-30P10 is discontinued but they have the TT one 25911-40P10 that the dealer says will not work even with gear change. You note it will work in the NA with the gear change on the TT shaft. Is that because each has the same calibration of AC voltage generated vs RPM? Or slightly different and will not mater for the speedometer? Thank you very much and appreciate your comment Pete
I'm not really sure. This video as made so long ago and I don't have this car anymore. Sorry. Just swap the gears and see if it works. Worst case it's just not gonna show the correct speed.
I know its been a while, and you don't have the car anymore, do you remember if you had to drop the transmission to get the sensor out? For some reason, its hard to find that out on google and youtube.
No I wasn't planning on it. It's really easy. It's in the passengers side of your transmission. There is only (1) 10mm bolt holding it in. Just unplug it, remove the bolt and it slides right out. Super easy.
You connected the wires differently on each one. First sensor was (coming from speedometer) yellow wire with black and black with red! Second speedometer was yellow with red and black with black!.
It doesn't really matter for what we're doing. If your checking continuity all your check for is that the wires are "connected" intermittently when your spinning it. If you are measuring the voltage, on my tester, all it may do is show negative voltage instead of positive voltage. In this case I don't care weather it shows negative or positive voltage I'm just looking for the value.
My speedometer sometimes works and other times it doesn't. When it doesn't the odometer also stops recording. I suspect it is the speed sensor. You have given me some ideas for testing.
Yeah it's probably the speed sensor. Check it out and post up if you fix it. Good luck!!
@@loluracing thanks for the response
@@loluracing Finally got around to it. Don't drive it much. Did replace the sensor with OEM but that didn't do it. Got serious after driving at 80 mph in a curve and power steering became boosted and felt like I was on ice. Problem became intermittent. Very scary. Came across info that if speed sensor is not replaced soon after it fails then a part in gauge cluster,maybe a transducer?, can burn out and ECU gets erroneous info and it can effect the p.s. boost. Sent cluster to repair shop. Shop could not get part and had to buy used cluster to scavenge part. Cluster repair plus shipping 2 ways,$435. 1 yr warranty. Put in cluster today n drove for 50 miles,no issues.
@@johnmichaelkarma The clusters fail in these cars due to dry solder. Its very hard to see and is 99% of the time the cause for failing gauges. If just your speedometer fails and resoldering the joints on the gauges does not solve the issue its the speed sensor. I fixed my speedo and tach about a year ago because they were intermittent, just touched up all the solder that looked bad and they've worked flawlessly ever since. Cost me $0. I've done it for 4 other Z's clusters now. Super common issue. My speedo is now going out and I have an automatic transmission, but this time its shifting is extremely erratic when the speedo stops working. It wont change gears or gets stuck in certain gears, wants to be in 1st while going 60 but cant because of the tach speed. This case is certainly a speed sensor issue.
Just figure I should write this here for anyone whos having intermittent tach and speedometer issues; if you know how to solder just take your cluster out, disassemble it (it just has snap tabs and some screws holding it together) carefully remove the gauges, then resolder everything that looks old/cracked/damaged then reassemble. I guarantee it'll solve the issue. Also important to take a close look at the windings on the posts for the gauge needle. They have a hair thin wire thats soldered to the post and if the solder there is damaged it will need to be resoldered EXTREMELY carefully, more rare but potential issue.
Great stuff, exactly what I suspected and you confirmed. Really really appreciate it !!!!!!
Glad I could help. That's all I make videos for. Lol
Ayy I just bought a '94 NA with 280k and I'm swapping out basically everything. I'll be sure to check that sensors power output. Thanks
Hello, I know this video is old, but I have a question if you’re able to answer. The sensor to the left of the speed sensor in your thumbnail. I got under the 93 z32 I recently purchased and found that sensor ziptied out of the way toward the rear of the transmission. Is that the turbine revolution sensor that is supposed to be located up toward the front of the transmission at the top? I haven’t been able to pull the exhaust off yet to be able to access the top of the transmission and was wondering if that’s where it’s supposed to be. Thanks in advance.
Both of these sensors are speed sensors. I'm not sure what sensor your talking about.
Wow encyclopedia man my respects to you tanks for the video I have my car is going 165 mph in the drive way 😢 hopefully I am trying to fix with your video my is automatic 🙏🏾😃
Awesome. Glad I could help and good luck
Just came across this video and great info on the speed sensor test, nice detailed presentation. Question I have a 1992 300zx NA manual 2 + 0 and the OEM speed sensor 25911-30P10 is discontinued but they have the TT one 25911-40P10 that the dealer says will not work even with gear change. You note it will work in the NA with the gear change on the TT shaft. Is that because each has the same calibration of AC voltage generated vs RPM? Or slightly different and will not mater for the speedometer? Thank you very much and appreciate your comment Pete
I'm not really sure. This video as made so long ago and I don't have this car anymore. Sorry. Just swap the gears and see if it works. Worst case it's just not gonna show the correct speed.
thank you for your response @@loluracing
I know its been a while, and you don't have the car anymore, do you remember if you had to drop the transmission to get the sensor out? For some reason, its hard to find that out on google and youtube.
I never dropped the trans from that car ever. So you shouldn't have to.
I remember something being a PITA to get unplugged but other than that you should be smooth sailing.
Would you have any tips for removing the sensor on an automatic transmission
Yeah, take out the auto and get a manual. Lol. Jk. Sorry I've never had an automatic. Not sure what they look like.
Are you going to make a how to replace video?
No I wasn't planning on it. It's really easy. It's in the passengers side of your transmission. There is only (1) 10mm bolt holding it in. Just unplug it, remove the bolt and it slides right out. Super easy.
Hi do you have the part number or link to get a new one
I bought mine from a gentlemen on marketplace. I'm not sure if you can buy a new one
You connected the wires differently on each one. First sensor was (coming from speedometer) yellow wire with black and black with red!
Second speedometer was yellow with red and black with black!.
It doesn't really matter for what we're doing. If your checking continuity all your check for is that the wires are "connected" intermittently when your spinning it. If you are measuring the voltage, on my tester, all it may do is show negative voltage instead of positive voltage. In this case I don't care weather it shows negative or positive voltage I'm just looking for the value.
You sure the na and tt speed sensor are the same? I thought the tt was taller
As far as I know the only difference is the gear due to the different ratios in the rear ends.
😃🙏🏾 súper