tyre pressure control

[thosoneill]

after the fitment of new tourance rubber by my bmw dealer i have to ride at least two miles before the rear tyre pressure is indicated on the on board computer - the front tyre pressure is displayed almost instantly on the on board computer - i took the bike back to the dealership today and the technician claimed that he had reset the TPC and that it was normal to ride a couple of miles before the readings appear on the on board computer - despite the reset i still have to cover a couple of miles before i get a reading for the rear tyre pressure - ok guys - is the technician talking bollocks - i had no problem with the TPC prior to the fitment of new rubber

 

[Belizibub]

Mine does that and has always done that, personally i thought that was normal

 

[Balders1450]

Mine works after 100yds!

 

[Hexme]

Mine works after 100yds!

Me too.

 

[Beemerman59]

Mine works after 100yds!

+1 same here

 

[thosoneill]

thanks guys - i contacted rainbow motorcycles for a second opinion - the technician agreed that it could take a while for the pressures to be indicated on the on board computer

 

[snerkler]

The user manual for the DOHC GSA states that the tyre pressures will be shown as soon as the bike goes over 30kph (18.6mph), which is exactly what happens with mine
Generally I find Rainbow's service excellent, but sometimes their knowledge on small details like this can be a bit lacking. I don't think they read the manuals

 

[thosoneill]

The user manual for the DOHC GSA states that the tyre pressures will be shown as soon as the bike goes over 30kph (18.6mph), which is exactly what happens with mine

the manual does not say the pressures will be shown as soon as the bike goes over 30kph - "because the sensors do not transmit tyre pressures until the motorcycle accelerates to 30 kph" - nothing there about actually displaying pressures - if you refer to the engineering details on page 92 of the users manual it states "the display shows - - for each tyre until the tyre pressure signal is received for the first time" it clearly does not specify when this should occur - so i don't think that you should cast aspersions on the knowledge of the techs at rainbow motorcycles

 

[snerkler]

the manual does not say the pressures will be shown as soon as the bike goes over 30kph - "because the sensors do not transmit tyre pressures until the motorcycle accelerates to 30 kph" - nothing there about actually displaying pressures - if you refer to the engineering details on page 92 of the users manual it states "the display shows - - for each tyre until the tyre pressure signal is received for the first time" it clearly does not specify when this should occur - so i don't think that you should cast aspersions on the knowledge of the techs at rainbow motorcycles

I stand corrected I would assume that as soon as info is transmitted it will be displayed. Unless you can come up with a logical explanation as to why, it makes no sense to me that the pressure is transmitted and then the OBC holds this info for 3-4 minutes before it decides to display them because as you say it displays -- until the signal is received. Well the signal is sent as soon as it reaches 30kph. So the signal is sent at 30kph, the ECU will surely receive it within ms's and send it to the OBC within ms's. Plus as I said, my bike does display as soon as I reach 18-20mph on the speedo. I've even experimented (sad but true) and mine is definately speed related and not time or distance related.
As for the Rainbow comment I think you may have taken it out of context. I stated how their service is excellent and was said tongue in cheek that they don't know all the finite details of the manual sometimes. I've had my own experience of this myself so not just relating it to this one issue. However, I know that they're not all so anal as to read every single manual that they get
But you find that with all dealers, bikes and cars. For example I know how my idrive works better than half the salesmen at my dealer

 

[littleredrooster]

Mine displays anywhere between 100yds and 2 miles. Always has - never been able to figure it out!

 

[thosoneill]

the purpose of my thread was to clarify whether i was being told nonsense by my local bmw dealership - i merely found it odd that after the fitment of new rubber the characreristics of the tyre pressure control would change - it is clearly evident that each bike is different - thanks for all the help in any case

 

[skywalker]

The pressure display can take a while to display on the dash.
The pressure sensor communicates to the bike either by the tyre pressure control unit or the alarm unit if fitted by a wireless signal which can be open to corruptive outside influences.

 

[snerkler]

The pressure display can take a while to display on the dash.
The pressure sensor communicates to the bike either by the tyre pressure control unit or the alarm unit if fitted by a wireless signal which can be open to corruptive outside influences.

Interesting. So I'm one of the lucky ones who's TPC is working right then

 

[skywalker]

Interesting. So I'm one of the lucky ones who's TPC is working right then

It would appear that yours reads quicker.

 

[thosoneill]

The pressure display can take a while to display on the dash.
The pressure sensor communicates to the bike either by the tyre pressure control unit or the alarm unit if fitted by a wireless signal which can be open to corruptive outside influences.

as you seem to know what you are talking about can you suggest why after the fitment of new tyres by my bmw dealer the effectiveness of TPC on my bike has diminished - its already been back at the dealer who said he had reset the system however today the readings on the on board computer disappeared and the yellow warning triangle was evident - after a half hour stop the readings reappeared however the rear tyre reading consistantly disappears and then reinstates on the OBC - i was so agrieved i phoned the dealer who said bring it back on tuesday - i am a bit pissed off as i had no issues whatsoever with the TPC prior to the fitment of new rubber
metzeler tourance by the way

 

[TeaPig]

Pehaps the metzeler has more steel in the carcass and the radio worms can't get through as easily? Or they bent the transponder a bit when they changed the tyre?

 

[snerkler]

Pehaps the metzeler has more steel in the carcass and the radio worms can't get through as easily? Or they bent the transponder a bit when they changed the tyre?

Nothing to do with the tyre as I've just had Tourances fitted and mine works as well as it always had.
Sounds very much like something's broken after reading the OP's last post with the reading flicking on and off.
I would ask the dealer to take the tyre off and look at the sensor itself.

 

[Beemerman59]

as you seem to know what you are talking about can you suggest why after the fitment of new tyres by my bmw dealer the effectiveness of TPC on my bike has diminished - its already been back at the dealer who said he had reset the system however today the readings on the on board computer disappeared and the yellow warning triangle was evident - after a half hour stop the readings reappeared however the rear tyre reading consistantly disappears and then reinstates on the OBC - i was so agrieved i phoned the dealer who said bring it back on tuesday - i am a bit pissed off as i had no issues whatsoever with the TPC prior to the fitment of new rubber
metzeler tourance by the way

Yours are doing exactly the same as mine did. It wasn't until they failed predictably that the dealer could say they were broken and replaced them under warranty. The rear totally failed a few months after the front so they were replaced seperately. That was two years ago and since then I have changed my own tyres - no problems to date.

 

[skywalker]

as you seem to know what you are talking about can you suggest why after the fitment of new tyres by my bmw dealer the effectiveness of TPC on my bike has diminished - its already been back at the dealer who said he had reset the system however today the readings on the on board computer disappeared and the yellow warning triangle was evident - after a half hour stop the readings reappeared however the rear tyre reading consistantly disappears and then reinstates on the OBC - i was so agrieved i phoned the dealer who said bring it back on tuesday - i am a bit pissed off as i had no issues whatsoever with the TPC prior to the fitment of new rubber
metzeler tourance by the way

I would suggest that they reteach in the TPS into the system rather than just clear the fault.
Alternatively get them to reflash the software for the RDC unit.
Its unusual for a fault like this to occur if it was ok prior to new rubber fitment but the case for "hamfistedness" can't be ruled out.