Does anyone know where the sensors are on the wheels? I just had Bridgestone replace both of my front tires (feathering issue). I told them that I had the Tire Pressure Monitoring system so they would be careful taking the tire off and putting the new one on. I was told by the Nissan Dealership that the sensors were in the valve stems. My gauge reads that I have 33psi in all 4 tires, but the reciept that they gave me says that they replaced the stems. I have looked at the stems and they look "factory". Can anyone shed a little light on this for me??

 

Dont worry.
They did not touch the valve stems and be happy that they did not and that everything works.
I'm sure that it is a standard computer print out whenever they change tires that says "Mounting, Balancing, change valve stems". The normal rubber valve stems are so cheap, that it is a good idea to change them at every tire change, so shops automatically do it. Sort of like the dealer checking other stuff when you get an oil change. Even if you tell them not to and they dont, the bill will still read "lube locks, oil and filter, check tire pressures etc.".

 

Cool.. Thanks!!!!!!!!!!!!!!

 

Here is pic of location of monitors

 

westpak,

Where did you find the picture you posted on the Tire Pressure Monitor System?

Thanks.

 

I have the Service Manual.

 

Cool...Thanks for the info.

 

Do you know if the sensors actually sense the air pressure, or do they simply use the revolutions of the wheel to sense pressure changes?

 

Does anybody know how much is the valve stem transmitter ? Or how does the transmitter tell which one is on the right/left/front/rear ? I would like to order an extra set of transmitter and put it on a set of winter wheels.

 

Well, here is the whole page, my guess is that it measure actual pressure. But you wonder if you can buy separate transmitters without having to buy the entire system or if they have to adjust the system, I would think that not all transmitters are on the same frequency, what if you park right next to another Z? Hey, I don't know, I don't care cause I don't have them.

 

Here is second and last age.

 

Please do a search of this forum first. I have already answered this question and posted the pages and text from a Nissan Tech magazine about the tire pressure sensors. The sensors sense the air pressure. Revolutions of the wheel activate the switch that connects the sensor to the sensor battery to preserve battery life when sitting still.

 

Nissan quoted me about $200 per sensor - you need 4! Each sensor transmits on a different frequency. If you have sensors on winter wheels, you must recalibrate the car onboard Tire Pressure Monitor computer to recognize the new frequencies at your friendly Nissan dealer with special tools. Each tire sensor transmits on a different frequency, and no, you cannot buy two identical TPM sensor sets with identical frequency numbers to avoid recalibration when swapping tires (- I already asked!). At the time of recalibration is when the vehicle computer "learns" which corner has which tire pressure.

 

Just to make this clear, the sensor all transmit on the same frequency: 315.00 MHz +/-100kHz AM, But each sensor has a different 24 bit ID code.

 

I priced the Nissan pressure sensors....

They are $250.00 EACH. I don't know if the trip computer would have to be replaced, or if the display feature becomes active when the pressure signal is detected.

I did find 3 other options for pressure monitoring:
Smart Tire Monitor

Alternate transducer

Accupressure Caps

 

My dealer said that they could not install any after market sensors due to liability issues. They will install the "factory" sensors, though.

Tire shops would be willing to do the install

A key point is that the wheel would need to be balanced after the install

 

I used to work at a tire shop (america's tire co) and did tire work on a lot of corvettes with the tire pressure sensors. The first kind that had the strap around the drop center with a weight on one side and the sensor on the other were a real pain in the ***. The later ones that were on the valve stems (like the Z's) are also tricky, but a bit easier to deal with.

Make sure when you take your Z in for tires that you notify the salesman and the guy doing the work that the sensors are there and on the valve stems because the tire removal and installation processes need to be done differently than on a wheel without the sensors. For example, if the guy breaks the bead by the valve stem he can destroy the sensor pretty easily.

Also make sure you go to a reputable place that has experience working on the sensors.

And do NOT use fix-a-flat!

 

What would happen if someone got aftermarket wheels and did not place the TPM sensor on them? Would the sensor monitor in the car show an error or just show 00 for no pressure?

 

I believe it would be like when you start up in the morning --- dashes everywhere!

 

What happened to thread that showed how to put the sensors on aftermarket wheel?