Tyre Pressure Monitoring System

[TitanTim]

Not sure if this a problem or not or I have a slow puncture :x

Zed has been running fine however a weird thing happened last weekend. I pulled the Zed out onto the drive and no problems and gave it a wash. When I switched the engine on after the wash the tyre pressure warning light flashed up with the audible bong. Checked all tyre pressures and they were correct i.e. 36 psi fronts and 37 psi rears. I reset the monitor and everything has been fine all week. Did the same today, pulled the Zed out no problems, washed it and then when I started up got the tyre pressure warning light and bong again :x Checked pressures again and all fine except the one rear which was down only 1psi. Have corrected the pressure and reset the monitor. I'm just curious as to way I'm only getting a warning only after I do a wash :? and why it didn't sound off before I did the wash. I don't know if its a fault with TPM with water affecting it after I wash or I have a slow puncture. Never had any problems on the 1 Series but I've read sometimes the monitoring system can give false alerts?

Any ideas?

Cheers,

Tim.

 

[K99]

Sounds like water is getting into the sensor, do you blast the wheels and disk with the hose when washing it?
I always spend a long time hosing the disks and calliper to get rid of brake dust but never had a problem. Maybe the rubber around the sensor is misaligned or split.

 

[Jembo]

Be careful using the jet wash on calipers, one of the causes of calipers seizing.

In terms of tyre pressures, might be worth undertaking a full reset, then watching it carefully over the coming weeks

 

[TitanTim]

Sounds like water is getting into the sensor, do you blast the wheels and disk with the hose when washing it?
I always spend a long time hosing the disks and calliper to get rid of brake dust but never had a problem. Maybe the rubber around the sensor is misaligned or split.

Thanks for the reply, yes I do tend to use the hose on the alloys and discs etc when washing but has been fine usually but as you say it could be a faulty sensor which is what I'm hoping rather than a puncture. When I wash next weekend will try and keep the hose off the brake calipers and see if it makes a difference and will keep an eye on tire pressures. I wouldn't have thought a drop of only 1psi would set the warning off :| I thought it was around 20% air loss?

Tim.

 

[TitanTim]

Be careful using the jet wash on calipers, one of the causes of calipers seizing.

In terms of tyre pressures, might be worth undertaking a full reset, then watching it carefully over the coming weeks

Thanks Jembo, I don't tend to use a pressure washer but I do use a hose, I checked the tyre pressures yesterday and 3 wheels were spot on but one was only 1psi down so have added some air rechecked and reset the monitor and will see how it goes.

Tim.

 

[Anonymous]

I thought the pressure monitor worked by sensing when a wheel was rotating at a different rate to the others, i.e. it doesnt know the actual psi in the tyre, it compares the rotations to what they were when the system was reset.

With this in mind, I dont understand why it would bong upon resterting the engine if the vehicle is stationary. Therefore, I suspect it possibly is a faulty sensor or something to do with water.

 

[TitanTim]

I thought the pressure monitor worked by sensing when a wheel was rotating at a different rate to the others, i.e. it doesnt know the actual psi in the tyre, it compares the rotations to what they were when the system was reset.

With this in mind, I dont understand why it would bong upon resterting the engine if the vehicle is stationary. Therefore, I suspect it possibly is a faulty sensor or something to do with water.

Thanks Kevin, hmmmmm I think you may be correct re wheel rotation so as you say I'm suspecting a duff sensor when water gets on it and its giving a false reading Will see how it goes but might be a trip to the dealer in a few weeks :x

Tim.

 

[ksher]

I thought the pressure monitor worked by sensing when a wheel was rotating at a different rate to the others, i.e. it doesnt know the actual psi in the tyre, it compares the rotations to what they were when the system was reset.

With this in mind, I dont understand why it would bong upon resterting the engine if the vehicle is stationary. Therefore, I suspect it possibly is a faulty sensor or something to do with water.

Correct. The system uses ABS sensor to monitor the rotation of the wheel.

 

[Anonymous]

I thought the pressure monitor worked by sensing when a wheel was rotating at a different rate to the others, i.e. it doesnt know the actual psi in the tyre, it compares the rotations to what they were when the system was reset.

With this in mind, I dont understand why it would bong upon resterting the engine if the vehicle is stationary. Therefore, I suspect it possibly is a faulty sensor or something to do with water.

Thanks Kevin, hmmmmm I think you may be correct re wheel rotation so as you say I'm suspecting a duff sensor when water gets on it and its giving a false reading Will see how it goes but might be a trip to the dealer in a few weeks :x

Tim.

If you ever have a problem with anything related to water ingress, I'm a friggin expert!!!

 

[TitanTim]

I thought the pressure monitor worked by sensing when a wheel was rotating at a different rate to the others, i.e. it doesnt know the actual psi in the tyre, it compares the rotations to what they were when the system was reset.

With this in mind, I dont understand why it would bong upon resterting the engine if the vehicle is stationary. Therefore, I suspect it possibly is a faulty sensor or something to do with water.

Thanks Kevin, hmmmmm I think you may be correct re wheel rotation so as you say I'm suspecting a duff sensor when water gets on it and its giving a false reading Will see how it goes but might be a trip to the dealer in a few weeks :x

Tim.

If you ever have a problem with anything related to water ingress, I'm a friggin expert!!!

:rofl:

Tim.