C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

valve stem pressure sensors

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Old May 28, 2010 | 12:41 PM
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Default valve stem pressure sensors

Need to locate valve stem tire pressure sensors for a 95. Both front stems were broken, as a result the LTP system shows a trouble / service light, this will not allow the cruise control to work. I either need to replace the stems or find a way to bypass the LTP system.
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Old May 28, 2010 | 03:16 PM
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Hmmm - I think all C4's had the tire pressure sensors attached to the wheel, not the valve stem.

its a big box with a band clamp around the inside of the wheel. You have to remove the tire to see it.
Someone with a 95 FSM point this guy out to the correct troubleshooting procedures for his LTPWS light and cruise control issues? Mines a 92 so I can't help too much.
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Old May 28, 2010 | 03:39 PM
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Originally Posted by jaa1992
Hmmm - I think all C4's had the tire pressure sensors attached to the wheel, not the valve stem.

its a big box with a band clamp around the inside of the wheel. You have to remove the tire to see it.
Someone with a 95 FSM point this guy out to the correct troubleshooting procedures for his LTPWS light and cruise control issues? Mines a 92 so I can't help too much.
Your 95 has a box that gets straped onto the inner drum of the wheel itself. The box has a colored label on it and they are specific for each wheel i.e. you can't have two of the same else the central system can't tell which wheel is sending out a low pressure warning.

The fact that your DIC system is displaying a service LTPWS light should have no impact on your cruse control at all. I have the sensors on my summer wheels and not my winter ones and I use the cruse all the time
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Old May 28, 2010 | 05:09 PM
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The sensors are particular to each wheel. They are powered by a Pizo battery that gets its energy when the wheel starts turning. Each sensor has a diffferent frequency that reports to the LTPWS module.

If one doesn't report you get a code.. System will also tell you if you have a low tire condition.

http://i125.photobucket.com/albums/p...SSENSOR001.jpg

Don't know what year these are from, but it's just for reference.

If you do have them replaced make sure you find someone familiar with the replacement procedure.
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Old Jun 1, 2010 | 07:23 AM
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Thanks, I got the cruise working, dry rot in a vacumn line.
Originally Posted by Mr. Peabody
Your 95 has a box that gets straped onto the inner drum of the wheel itself. The box has a colored label on it and they are specific for each wheel i.e. you can't have two of the same else the central system can't tell which wheel is sending out a low pressure warning.

The fact that your DIC system is displaying a service LTPWS light should have no impact on your cruse control at all. I have the sensors on my summer wheels and not my winter ones and I use the cruse all the time
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