Question about the calibration process:
The manual describes the process quite clearly and I have just checked all the pressures and done the "initialisation", and got the "Completed" message.
BUT I am not going to be driving the car for 24 hours. I believe the calibration process includes driving the car for 30 minutes. Is the 30 minutes driving meant to be immediately after the initialisation? or will it do it when I start driving tomorrow?
Think I might redo the initialisation before setting off tomorrow. Don't really want a warning on the M1.
Right...I
did redo the initialisation immediately before setting off this morning.
24 minutes later, 10 miles up the M1, got a tyre pressure warning!
Stopped at next services and checked pressures (in case I really had had a second nail) but all four wheels exactly 2 psi higher than when I set them cold yesterday.
So re-initialised again.
29 minutes later....another warning.
This time I ignored it and carried on home.
My Provisional conclusions:1. A brand new tyre takes more than 53 (24+29) minutes (about 40 miles) to stabilise its rolling radius.
or
2. The combination of one different brand new tyre with three 37,000 mile ones is outside the capability of the TPMS.
or
3. The TPMS is unreliable and does not always initialise and calibrate properly.
In support of no 1. is that many of the false warning reports, including my own, are with the car when very new. Although of course on a brand new car all four tyres are new so the running in differences would be less than my case with one brand new tyre.
No 3 could be true in addition to 1 or 2.
The fact that my system behaved perfectly for more than two years, and then gave a correct warning, seems to imply that once the calibration has worked and the tyres have run-in, it is trustworthy and useful.