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  #1 (permalink)  
Old 10-08-2008, 06:47 AM
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Yet another TMPS issue ...

So I got a tire fixed about 1 1/2 weeks ago; there was a bolt in it... basic tire repair ...


Always, before I left the shop, I reset the pressure sensors... Its been almost 2 weeks now and it is still telling me that its 'learning'.

I have tried to reset it multiple times, but still nothing ...

can anyone give me some advice...
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  #2 (permalink)  
Old 10-08-2008, 02:35 PM
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Quote:
Originally Posted by Hosterman001 View Post
So I got a tire fixed about 1 1/2 weeks ago; there was a bolt in it... basic tire repair ...


Always, before I left the shop, I reset the pressure sensors... Its been almost 2 weeks now and it is still telling me that its 'learning'.

I have tried to reset it multiple times, but still nothing ...

can anyone give me some advice...
One guess is that the tire shop messed up the sending unit when they did the repair. I'm sure that you know that the car has to be moving to learn but just in case.
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Old 10-08-2008, 03:06 PM
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Did you use the 'tire sealer' that came with the car?
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  #4 (permalink)  
Old 10-08-2008, 07:22 PM
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No, they took off the tire and put a patch on the puncture. Do you think they messed up that sensor? And if so, wouldnt the others respond by themselves?
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  #5 (permalink)  
Old 10-08-2008, 07:42 PM
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I asked about the sealer because it can clog the sensor.

I'd suggest reseting the TPMS by changing wheels in the TPMS settings, then do some driving. It can take some time for it to recognize them again.
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Old 10-08-2008, 08:19 PM
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Strange that it is happening after the tire repair. I don't know if one bad sensor would confuse the module or not but I never believe in coincidences. TPMS is a little network and you know how much fun it is to solve network issues. As Gator Bite suggests it can take some time for the computer to learn. I've heard of as much as a half hour of continuous driving being required (i.e not turning off the engine).

Last edited by Santa Fe; 10-08-2008 at 08:21 PM.
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Old 10-08-2008, 08:41 PM
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My TPMS system is very eccentric. When it says I have low pressure in one tire (-4 ) it is infact not lower. It likes to relearn often. It will have learned, then forgot it learned and then wants to relearn. Often I start the car and it shows blanks, so I don't know if I have a flat or not, so I end up using my tire guage. I admit the TPMS system has made me check my pressures many more times than I normally would (not necessarily bad), but consumes time, and introduces grime into the equation. ON the hands, on my pants when I kneel down, or brush my car when it is dusty.

I am not a big fan of my TPMS. Recently I decided to pump up the pressures to 35-36 front, 39-40 rear (stone cold), (stock 19s Michelins PS2s) and things have stayed stable now for a few weeks. For such a young circuit I did not expect this degree of Alzheimers in my circuits.

Before TPMS I use to routinely check my tires at the gas station every other fillup. Now the air hoses are never at the gas pumps, usually off somewhere else at the station, and cost money to operate. Half the time they don't work, and many times I would feed the beast quarters, and after checking and filling my 3rd tire, it would shut off. So I forget these damn things now. I usually end up digging out my electric driven 12 Volt air pump, requiring my extension cord, 12 volt/110 volt cigarette adapter/ converter, and air guage, about every month or so , or more if needed based on Senior TPMS' mood.
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Last edited by RobMason; 10-08-2008 at 08:54 PM.
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Old 10-08-2008, 09:46 PM
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Rob I'd suspect your tire gauge(s). See this FAQ for more. The Cayman Club - FAQ: Cayman Options

By law TPMS must remind you when you reach a certain % of the recommended tire pressure I believe. That margin plus the usual discrepancy of tire gauges plus environmental changes can make TPMS seem flakey.
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Old 10-08-2008, 10:03 PM
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I suspect Porsche overengineered the thing a bit. Temperature compensation and wheel size? Just reading out the actual pressure and and setting the alarm at some value a few psi lower then spec would have got the job done without being a pain about it.
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Old 10-08-2008, 10:52 PM
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It is actually made by Beru and some of the complications are US government mandated (direct measurement for example instead of the old ABS indirect approach).

If you want to see just how complicated the things are I recommend http://www.beru.com/download/produkt...tss_3gen_e.pdf and http://www.beru.com/download/produkt...satz_tss_e.pdf

It is obviously early days still for the devices but given what they are asked to do in the environment they are used in it is pretty remarkable they work at all.
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