Disabling TPMS? It is possible?
JK Enthusiast
Joined: Oct 2008
Posts: 162
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From: WATERFORD, PA
Some of us may run 2 sets of tires stockers (road tires) for long trips and mudders for winter and weekend fun. It would be nice to be able to disable the TPMS while wheeling without buying more sensors
JK Junkie
Joined: Dec 2008
Posts: 2,540
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From: New France
JK Enthusiast
Joined: Jan 2009
Posts: 144
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From: Doswell, Virginia--- Roanoke, VA
I just got some brand new tires today and the TPMS signal did not start going off until about 60 miles. How low can you get the cpu flashed for it? Could you possibly get it flashed for 0 and then just have them in the glove box?
JK Enthusiast
Joined: Mar 2008
Posts: 442
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From: Bangor Maine
Sorry to bring up an some what old thread, but I had my tires rotated and now my TPMS light is on and wont go off. I am running the stock rims with 33"km2's and some mornings the light would be on if the temps was really cold but once I stated driving it would go off. I just rotated for the fist time with these new tires and now the light is on and wont go off. I am going to check the tire pressure, maybe they messed up at the dealer who knows. Anyone shed some light on this...If not I guess I can live with it..
JK Super Freak
Joined: Jan 2009
Posts: 1,004
Likes: 0
From: LSU-Death Valley, Louisiana
Sorry to bring up an some what old thread, but I had my tires rotated and now my TPMS light is on and wont go off. I am running the stock rims with 33"km2's and some mornings the light would be on if the temps was really cold but once I stated driving it would go off. I just rotated for the fist time with these new tires and now the light is on and wont go off. I am going to check the tire pressure, maybe they messed up at the dealer who knows. Anyone shed some light on this...If not I guess I can live with it..
JK Super Freak
Joined: Feb 2009
Posts: 1,942
Likes: 1
From: Tampa, Florida
pro cal is the bomb! Also mounting all sensors in the spare does work... I did this on my Tundra... Also, on my Cherokee I didn't have the sensors in when I traded it in and there was never any issue with the tpms light from the dealer
JK Enthusiast
Joined: Feb 2008
Posts: 233
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From: Northern Va
I think some folks might be missing the point here.....to summarize what has already been said in this post:
You can't just put them in the spare tire, or in the glove box, or a pressurized PVC pipe (unless you tape that to your wheels lol). 4 of the 5 have to be spinning:
And it is ILLEGAL to remove them or bypass the system. You won't be able to sell it back to a dealer (maybe you can trick someone into buying it from you), but it won't pass inspection:
Still feeling like you want to "just cut the wire"?
I'm not trying to be negative here. I would like to disable it too - every time I go offroading the light is on. But, if you lose pressure somehow on the highway at highway speeds, can't you see where this is actually useful?
You can't just put them in the spare tire, or in the glove box, or a pressurized PVC pipe (unless you tape that to your wheels lol). 4 of the 5 have to be spinning:
Nope. Early TPMS were indirect reading systems and used the rotational speed of the wheels as measured by the ABS system to sense if one wheel was spinning faster or slower than the other three wheels. If this was the case, the TPMS would assume the odd ball tire was flat and alert the driver. The major drawback to these systems was that all four tires could be low on pressure and the typical idiot driver the legislation was designed to protect would be none the wiser. The major advantage was cost savings--no need to put sensors in each wheel--use the electronics that are already there for the ABS system.
The Jeep TPMS is a direct reading TPMS. The pressure of each wheel is directly measured using a micro electromechanical structure (MEMS) pressure sensor and radioed at 315MHz to the ECU using a sensor assembly that is integrated with the valve stem. In other words, the ECU knows the exact pressure of each tire. Just placing the sensors in a pressurized environment (a spare with five valve stems?) won't work because the sensors also have MEMS accelerometers that are used to wake the rest of the sensor up and report whether or not the wheel is actually spinning to the ECU too.
For more information, look for an earlier post of mine on another TPMS thread with links to both the FCC OET and USPTO documents I found on these things.
The long term solution is that the after market rim manufacturers will eventually incorporate space for the sensors in their rims and they will become an additional item on the invoice when you buy after market wheels with the tires already mounted and balanced.
The Jeep's system needs to let you set the alert pressure when in 4LO and monitor the status of the spare tire though.
-Glen
The Jeep TPMS is a direct reading TPMS. The pressure of each wheel is directly measured using a micro electromechanical structure (MEMS) pressure sensor and radioed at 315MHz to the ECU using a sensor assembly that is integrated with the valve stem. In other words, the ECU knows the exact pressure of each tire. Just placing the sensors in a pressurized environment (a spare with five valve stems?) won't work because the sensors also have MEMS accelerometers that are used to wake the rest of the sensor up and report whether or not the wheel is actually spinning to the ECU too.
For more information, look for an earlier post of mine on another TPMS thread with links to both the FCC OET and USPTO documents I found on these things.
The long term solution is that the after market rim manufacturers will eventually incorporate space for the sensors in their rims and they will become an additional item on the invoice when you buy after market wheels with the tires already mounted and balanced.
The Jeep's system needs to let you set the alert pressure when in 4LO and monitor the status of the spare tire though.
-Glen