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Discussion Starter #1
Hi,

today I replaced my 16inch tyres with the fn2 18inch rims.

when I compared tyres by putting one on top the other I was not able to notice a difference in diameter.

after I replaced the tyres and drove a couple of miles the tyre pressure warning was turned on. Is this normal? Do you have an idea how the ecu calculates the tyre pressure?
 

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Reasonable Tenor voice
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It just might need resetting and recalabrating, see the manual
 

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That's totally normal. Just needs reset, tells you in the manual how to do it.

This will also usually happen if you have new tyres fitted.
 

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Discussion Starter #5
Thanks to all. Computer resetted . Will drive another couple of miles and hopefully the error will not pop up again.

do you know how tyres pressure is calculated?
 

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do you know how tyres pressure is calculated?
It doesn't calculate tyre pressure.

I believe monitors the relative speed of each of the wheels using the ABS sensors. If a tyre is soft it has a slightly smaller diameter so turns faster.
 

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Discussion Starter #7
You suggestion makes sense. So this means that when resetting the computer it will recalculate a cycle duration?
 

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It won't measure the cycle duration as that will change with speed it just compares the relative speed of the wheels. I think it might compare f+r axles separately as I swapped wheels front to rear on 1 side then drove about 3 miles and the light came on then swapped the other side so had now done a complete front to rear swap, didn't reset it and the light never came back on.
 
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