Anyone know how tyre monitors work?
Discussion
Had two rears fitted this morning by a mobile fitter.
Just driven car for first time and the puncture warning has gone off.
I didn't even know I had a tyre warning system. No punctures tyres look and are inflated.
Anyone seen this issue before?
Something the fitter hasn't done properly?
Just driven car for first time and the puncture warning has gone off.
I didn't even know I had a tyre warning system. No punctures tyres look and are inflated.
Anyone seen this issue before?
Something the fitter hasn't done properly?
You need to reset the system as the tyre pressures have changed. Have you checked them since the fitter pumped them up? You might find one at 40psi and one at 30psi. The differential is usually the reason for the alert.
On my BMW they work using the ABS sensors and measure the difference in rotation speed betwen the tyres caused by under inflation.
There is either a button on the dash or an option in the trip computer to reset the calibration. Once you've checked all the tyre pressures are correct, reset it and everything should be OK once again. Likely that the tyre guy wouldn't have a clue about this one.
There is also a system which has sensors in the tyre valve stem. Hopefully yours isn't this system because if he's replaced the valves then he's probably chucked the sensors away and replaced with non sensor valves.
On my BMW they work using the ABS sensors and measure the difference in rotation speed betwen the tyres caused by under inflation.
There is either a button on the dash or an option in the trip computer to reset the calibration. Once you've checked all the tyre pressures are correct, reset it and everything should be OK once again. Likely that the tyre guy wouldn't have a clue about this one.
There is also a system which has sensors in the tyre valve stem. Hopefully yours isn't this system because if he's replaced the valves then he's probably chucked the sensors away and replaced with non sensor valves.
What sort of car is it?
Mine (SEAT) isn't a pressure sensor, it compares the speed of all four wheels.
A flat tyre will rotate at a different speed, and trigger the alarm.
Similarly a new tyre with more tread on will have a slightly larger diameter.
Just pushing the button until the light goes out seems to work on mine.
Mine (SEAT) isn't a pressure sensor, it compares the speed of all four wheels.
A flat tyre will rotate at a different speed, and trigger the alarm.
Similarly a new tyre with more tread on will have a slightly larger diameter.
Just pushing the button until the light goes out seems to work on mine.
Assuming it's the M3 the (bimmerfest says) Scroll through your on-board-computer till you find the tire with the exclamation in the middle and the word "INIT" underneath it. The car has to be at a complete stop for you to be able to get this option. Once you find it, press the button on the tip of the stalk inward and hold it until you get a check mark. Once you see the check, (might have to press it twice and hold) you can drive away. All tire pressures are now recorded.
Burrito said:
Assuming it's the M3 the (bimmerfest says) Scroll through your on-board-computer till you find the tire with the exclamation in the middle and the word "INIT" underneath it. The car has to be at a complete stop for you to be able to get this option. Once you find it, press the button on the tip of the stalk inward and hold it until you get a check mark. Once you see the check, (might have to press it twice and hold) you can drive away. All tire pressures are now recorded.
Did a Chav design this feature? 
AFAIK there are two types of system.
1) ABS System. As used by VAG group and no doubt others. Uses the ABS sensors to measure individual wheel speeds and picks up a potential puncture by detecting a higher wheel speed.
2) 'Proper' System. Can't think of any other way of describing it. These systems have proper pressure sensors on the back of the valves which report actual pressure to the ECU. Much more accurate than above. Downsides, valves cost £80 each, plus ECU resetting by main stealer. Used by Peugeot.
A mate has the later fitted to his 407 and has now had all four valves replaced of a 55 plate car.
1) ABS System. As used by VAG group and no doubt others. Uses the ABS sensors to measure individual wheel speeds and picks up a potential puncture by detecting a higher wheel speed.
2) 'Proper' System. Can't think of any other way of describing it. These systems have proper pressure sensors on the back of the valves which report actual pressure to the ECU. Much more accurate than above. Downsides, valves cost £80 each, plus ECU resetting by main stealer. Used by Peugeot.
A mate has the later fitted to his 407 and has now had all four valves replaced of a 55 plate car.
Edited by Megaflow on Saturday 20th August 20:11
Megaflow said:
2) 'Proper' System. Can't think of anything way of describing it. These systems have proper pressure sensors on the back of the valves which report actual pressure to the ECU. Much more accurate than above. Downsides, valves cost £80 each, plus ECU resetting by main stealer. Used by Peugeot.
Never,ever use metal dust caps with this sort!!!^^^ This
I had a 407 coupe and was given a set of metal dust caps. They reacted with the valves and welded themselves to the valve. Snapped the buggers getting the caps off. Peugeot very kindly replaced the lot under warranty. They actually worked very well and never had a problem with them otherwise.
I had a 407 coupe and was given a set of metal dust caps. They reacted with the valves and welded themselves to the valve. Snapped the buggers getting the caps off. Peugeot very kindly replaced the lot under warranty. They actually worked very well and never had a problem with them otherwise.
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