Reading Tire Pressures Real Time via TPMS Sensors
 

My new 2017 Kia Sportage will actually display in real time (or close to it) the pressure of each tire via a display on in the gauge cluster. Assuming that works off of the TPMS. Very cool feature.

Would love to be able to read the tire pressures in real time in my BRZ rather then just having an idiot light in the dash. Besides the reprogramming and hand tools which would not do you good while actually driving, does anyone know of a system that can read the TPMS sensors or plug into the OBD2 port to display that info in real time?

The only thing I found are those systems which have the sensors in the value stem caps and has a display that plugs into 12V port.

I believe @Shiv@Openflash was working on it, but I haven't seen any actual progress on it yet. But then again, I'm not following that too closely. Torque may be able to do it?

I like that feature too. Subscribed.
I think that perhaps changing the sensors will be needed. There quite a lot aftermarket systems available, they even can monitor the air temperature which is great I think and it is the way I would go.

Ours do. I was just at the dealer to have the sensors in my wheels registered with my car (long story! The Story )

While the tech was doing it he showed me all the parameters the sensors were sending to the car which included temperature. Has was using a (very expensive I assume) Snap-On programmer to check everything.

Great info. Now the harder bit - how to read that data in a car :iono:

Your TPMS sensors send a data packet every 10 seconds or so when they see motion. As mentioned, they send temperature, movement (yes or no), and individual pressure. We lack the secondary ECU for autolocation so they dont know where on the vehicle they are. Everything goes through the CANBUS setup so getting the reading shouldnt be difficult honestly. It just comes down to programming OFT or something to actually pull that information.

You can see all that information with tech stream (non lite) or similar equipment.

Can it be possible to read it out thru torque if we know where they are being transmitted (custom PIDs in torque)?

@Shiv@Openflash

Has there been any progress on this? I tried searching...

I thought about this a while back. Sounds like a project for a RaspberryPi or Arduino pro (which I am not).

- Andrew

If anyone found the CAN or OBD-II PIDs for tire pressures and temps, let me know!

Techstream reads tires pressure, so this data is accessible by OBD.

A ScanGauge can read tire pressure and temperature from the OBD port. It only updates every 3 to 5 minutes but I don't know how often the TPMS sensors actually report data. But how often do you realistically need an update?

Here's a thread with more from 2013:

https://www.ft86club.com/forums/showthread.php?t=28374

And an update from 2018:

https://www.ft86club.com/forums/showthread.php?t=128103

NICE, thanks for digging this up!

So if I'm reading https://www.scangauge.com/toyota-tpms-method-2/ correctly,
the bytes that get sent over the CAN bus for the request are 0x07502A2190.

I'll need to spend some time trying to figure out how to enter it into e.g. RaceChrono.
Dang, I just swapped took my daily wheels with TPMS off the car and put AutoX wheels on, now I can't wait to swap back.

I know that for fuel level the RaceChrono setup is
Here's the ScanGauge setup for the same data:
07C02129 looks like 0x07C0 + 0x2129.

So 0x07502A2190 could be something like
OBD-II header: 0x750
PID: 0x2A2190
?

Also will need to read ScanGauge manuals on what all those RXF/RXD/MTH codes mean, so that we can figure out what scale/offset to use.

If somebody figures it out before me, we will all appreciate if you post your findings here :)