Tyre Pressure Sensor - How Does it Work?

[Fouros]

they are a sealed unit, the 05+ tpms system is a bit different to the 04 US KJ System i have in mine, your system has recievers in the wheel well

my recievers are in the EVIC

if the battery goes flat you must replace the sensor, saying that the batteries are supposed to last 10 years or so

[ferraricheals]

this was one of the first mods I made to our KJ after we picked it up - those winter roads in Northern Ireland really don't do any good for the interface between the gap and the valve stem - when I tried to remove the caps from the front tyres to increase the pressure both of the alloy stems fractured. I subsequently discovered this is usual with all brands, not just ours.

Anyway, this was on the Thursday morning and we were booked on the Dover-Calais ferry at 09.30 next day for the drive back to Italy, so decided the TPMS system is for no-brainers who don't take the time to regularly check their tyre pressures manually and drove carefully down to the nearest tyre shop to have all 4 TPMS units replaced by standard valves (two of the units are OK).

If anyone can tell me how to disable the warning lights from the TPMS system I'll be very happy!!

[Jonny Jeep]

Not sure what it does exactly or if it will help but there is an option in the Electronic Vehicle Information Center (EVIC) to retrain the tyre pressure sensors.

RETRAIN TIRE SENSORS - This programmable feature only applies to vehicles equipped with the optional Tire Pressure Monitoring System. The options include Yes and No. The default is No. When Yes is selected, and the menu button is depressed, the EVIC will enter the training mode starting with the left front tire.

How it will react with no sensors present I don't know.

In case you don't know how to program the EVIC...

(1) Turn the ignition switch to the On position.
(2) Depress and release the Menu push button. The first item in the programmable features menu list will appear in the EVIC display.
(3) Momentarily depress and release the Menu push button to step through the programmable features list. Each programmable feature and its currently selected option will appear on the EVIC display in the sequence shown in the Programmable Features list that follows.
(4) Momentarily depress and release the Step push button to step through the available options for the programmable feature being displayed.
(5) The option that last appears in the display with a programmable feature before exiting the programming mode, becomes the newly selected programmable feature option.
(6) The EVIC exits the programming mode and returns to its normal operating mode when the C/T push button is depressed or when the end of the programmable features menu list is reached, whichever occurs first.

[ferraricheals]

thanks, Jonny, will give this a try - guess what I was really looking for was something in setup menu somewhere which would enable me to disable the TPMS - at the moment I have the amber warning light for low tyre pressure on all the time!

[Rossow]

Anyone have any idea how to retrain the TPMS without an EVIC installed?

Appreciated

Rossow

[SeaComms]

The problem I have found with the damn thing is the "boy who cried wolf" syndrome. I run my tyres at 33psi, just fractionally above the 32 that sets them off. So they were always chiming in every couple of days and annoying the missus.

The other morning as she drove off she yells out the window that the damn low pressure alam was goinf off and I had a quick look and said alls good go to work.

I come home that night and here it is sitting there with a dead flat tyre....

In the JK, you simply remove them altogether and drive. After 15 to 20 minutes it finally decides you no longer have them and gives up. Apparently..