tpms compatibility? - Toyota Yaris Forums

CTScott · 07-09-2009, 10:22 AM

I now have three sets of wheels - OEM steelies, Mini Cooper 5 spoke, and Toyota TTE Pittlane. I personally left my TPWS sensors on the steelies (which I will probably never use again). The sensors would work on the Mini wheels, but not on the Pittlanes.

You can definitely grab a set of 08 sensors and use them. Any decent tire shop (and of course the dealerships) can do the reprogramming when you switch between tires. My local dealership charges $90 to do the reprogramming, but I would bet that tire shops charge way less.

The primary purpose of the system is not safety, but rather environmental. I heard a statistic at an RFID conference that if every car in the world was running at proper inflation (rather than some percentage being low) CO2 emissions would be reduced by (if memory serves me correct) 50 million tons per year.

I have been doing some reverse engineering on the TPWS ECU, and have a solution (not yet implemented) to the multiple sets of wheels, choosing to run at higher pressure, using different sized rims, etc. issues.

I believe that I can intercept the data between the sensors and the module and relay massaged data. By doing this I can have my module memorize multiple sets of sensors and allow calibration of the data from those sensors (i.e. adjust for running at higher pressure, etc.) The data that my module would pass, would be repackaged with the ID of the original sensors and with the pressure normalized to what the OEM system was calibrated to.

This would also allow for a more realtime display of the tire data (either a simple display with 4 bicolor LEDs, or a more elaborate LCD display showing pressure and temp for each of the 4 tires.

SailDesign · 07-09-2009, 11:32 AM

Quote:

Originally Posted by CTScott

...
I have been doing some reverse engineering on the TPWS ECU, and have a solution (not yet implemented) to the multiple sets of wheels, choosing to run at higher pressure, using different sized rims, etc. issues.
...

You mention higher pressures a couple of times here. Is there something the TPMS system does with that? I'm running a bit high, and no trouble with the TPMS light.

CTScott · 07-09-2009, 11:50 AM

Quote:

Originally Posted by SailDesign

You mention higher pressures a couple of times here. Is there something the TPMS system does with that? I'm running a bit high, and no trouble with the TPMS light.

The system does detect both high and low. I just checked the service manual for the high limit, and I don't any hypermilers are going to get close to it: 87psi

SailDesign · 07-09-2009, 12:37 PM

Quote:

Originally Posted by CTScott

The system does detect both high and low. I just checked the service manual for the high limit, and I don't any hypermilers are going to get close to it: 87psi

I think i'm safe, then.

gammaray · 07-09-2009, 03:17 PM

Similar to what was stated above....my dealership charges $85 for the transfer, and a local tire establishment said they would charge $40.

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07-09-2009, 10:22 AM	#1
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	I now have three sets of wheels - OEM steelies, Mini Cooper 5 spoke, and Toyota TTE Pittlane. I personally left my TPWS sensors on the steelies (which I will probably never use again). The sensors would work on the Mini wheels, but not on the Pittlanes. You can definitely grab a set of 08 sensors and use them. Any decent tire shop (and of course the dealerships) can do the reprogramming when you switch between tires. My local dealership charges $90 to do the reprogramming, but I would bet that tire shops charge way less. The primary purpose of the system is not safety, but rather environmental. I heard a statistic at an RFID conference that if every car in the world was running at proper inflation (rather than some percentage being low) CO2 emissions would be reduced by (if memory serves me correct) 50 million tons per year. I have been doing some reverse engineering on the TPWS ECU, and have a solution (not yet implemented) to the multiple sets of wheels, choosing to run at higher pressure, using different sized rims, etc. issues. I believe that I can intercept the data between the sensors and the module and relay massaged data. By doing this I can have my module memorize multiple sets of sensors and allow calibration of the data from those sensors (i.e. adjust for running at higher pressure, etc.) The data that my module would pass, would be repackaged with the ID of the original sensors and with the pressure normalized to what the OEM system was calibrated to. This would also allow for a more realtime display of the tire data (either a simple display with 4 bicolor LEDs, or a more elaborate LCD display showing pressure and temp for each of the 4 tires.

07-09-2009, 03:17 PM	#5
gammaray Drives: 09 3D Liftback Join Date: Jun 2009 Location: Tn Posts: 37	Similar to what was stated above....my dealership charges $85 for the transfer, and a local tire establishment said they would charge $40.