GolfGTIforum.co.uk
Model specific boards => Golf mk5 => Topic started by: jphealy on 23 February 2009, 09:05
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I filled my tyres to 2.4 bar the other day, and tried out the tyre pressure button (I've only just got my GTI). So I turned on the ignition, and pressed and held the button and waited for a beep. I didn't get anything though. Eventually I let the button go (probably after 10 seconds or so) and it beeped as soon as I let it go. I tried it again, holding the button for even longer, and again it only beeped when I let it go. Is that what's supposed to happen? How are you meant to know how long to hold the button? Do you reckon my pressures are set correctly?
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Not an answer but I am also interested to know how this works, I presume you are talking about the set button?
Do we need Highline to tell us the pressures of our tires or what? :undecided:
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I don't think it tells you the pressure. AFAIK the idea is you set the tyres to the correct pressure, then press the "set" button by the gear lever - then, if one or more tyres deflate beyond some specified limit, the warning comes up on the dash. My problem was that when pressing the set button, I didn't get a beep until I let the button go, whereas the manual says to hold the button down until it beeps. Hope that makes sense!
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You have done it correctly, hold button in and wait for light on dash to flash, it bleeps when you let go of the button, forget the manual. After that the system works via the ABS sensor, ie if the tyre deflates, it will rotate faster, the ABS sensor will flag this as a problem.
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+1.
I did this recently when I found the garage had deflated the tyres down to 2.2bar. Pumped them back up, turned on the ignition (but didn't start the car) and press and hold the button. It was about 5 seconds before it "bong"ed
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Thanks guys. Two conflicting views though. Kent, like me, only got a beep on release of the button (I didn't notice the light flash on dash, but I wasn't looking for it - I'll try it again to see if I get this); and stealth held the button and got a bong after about 5 seconds. Maybe slightly different systems are in different model year cars or something.
Anyway, it's not life or death - but thanks for the info!
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Are the sensors paired with the axles? i.e if you change the wheels front to back or N/S to O/S they will not work?
I am sure when I had my tyres done a few months back the chap was speaking about this being the case?
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Mine does what the manual says - it bleeps after about 5 seconds holding the button.
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I filled my tyres to 2.4 bar the other day, and tried out the tyre pressure button (I've only just got my GTI). So I turned on the ignition, and pressed and held the button and waited for a beep. I didn't get anything though. Eventually I let the button go (probably after 10 seconds or so) and it beeped as soon as I let it go. I tried it again, holding the button for even longer, and again it only beeped when I let it go. Is that what's supposed to happen?
Nope. That sounds like the TPMS was never 'initialised' by the stealer during the PDI.
OK, try this. Double check the actuall pressures in all four wheels again. Use only a PCL-type pencil tyre pressure gauge or a dial type gauge. Do NOT use any of the 'digital' pressure gauges - they are just far too unreliable. And don't rely on the gauge on the tyre inflator at you local petrol station, nor rely on the gauges (digital or analogue) on portable 12 volt tyre inflators.
Then, to "initialise" the TPMS, sit in the car (and ideally, have your normal 'loading' in the car too), turn on the ignition, start the engine and put on your seat belt (or wait for the seat belt warning to disappear). Then, press and HOLD for at least 2 seconds (so make that 5 seconds, just to be sure :wink:) both the TPMS and ESP buttons at the same time - and watch the instrument panel. Whilst holding both buttons down for at least 2 secs, you should a warning 'bong/ping' noise, and the TPMS amber warning light in the dash should briefly illuminate. Stop the engine, get out, lock the car, wait a good five minutes, and then the TPMS should be fully activated (and also have the tyre 'pressure' stored - although to be pedantic, it doesn't actually store the actual pressures).
How are you meant to know how long to hold the button?
Normally, about 2 seconds.
Do you reckon my pressures are set correctly?
The ONLY way to guarantee that your pressures are correctly set is to use your own old skool tyre pressure guage. The TPMS on the Golf5 is actually shyte.
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You have done it correctly, hold button in and wait for light on dash to flash, it bleeps when you let go of the button, forget the manual. After that the system works via the ABS sensor, ie if the tyre deflates, it will rotate faster, the ABS sensor will flag this as a problem.
Actually, to be pedantic, they arnt called 'ABS sensors'. The correct name for them is 'road wheel speed sensors' - and they provide rotational speed information to many other components/systems - engine ECU, transmission ECU, Haldex ECU, satellite navigation, CAN-BUS (for the dash panel insert - for the speedo), TPMS - as well as the ABS and ESP systems. :nerd:
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Are the sensors paired with the axles? i.e if you change the wheels front to back or N/S to O/S they will not work?
Nope. The TPMS works on a 'four channel' basis, whereby all four wheels are indvidually monitored.
However, if you happen to change the wheels around, then if the tyres have different rolling radiuses (either due to tyre wear, or simply due to different tyre brands/types), then the TPMS may very well send a warning.
I am sure when I had my tyres done a few months back the chap was speaking about this being the case?
Hmmmmmm . . . I doubt most tyre fitters would know the detail of how TPMS works - though they were correct in advising you of ramifications of rotating wheels around.
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Welcome back T_T.
Do NOT use any of the 'digital' pressure gauges - they are just far too unreliable.
Last weekend, inflated all tyres (after stealers seemed to have deflated them!) using a foot pump. Checked pressures using both an analogue guage like >this< (http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_566763_langId_-1_categoryId_165648) and a digital guage like >this< (http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_566871_langId_-1_categoryId_165648). Both were congruent in their readings so I'm assuming this means that the digital one was adequately accurate compared to the analogue guage.
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I am sure when I had my tyres done a few months back the chap was speaking about this being the case?
Hmmmmmm . . . I doubt most tyre fitters would know the detail of how TPMS works - though they were correct in advising you of ramifications of rotating wheels around.
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Ohh dear I didnt realise this would be a problem! What are the ramifications?
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Welcome back T_T.
Do NOT use any of the 'digital' pressure gauges - they are just far too unreliable.
Last weekend, inflated all tyres (after stealers seemed to have deflated them!) using a foot pump. Checked pressures using both an analogue guage like >this< (http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_566763_langId_-1_categoryId_165648) and a digital guage like >this< (http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_566871_langId_-1_categoryId_165648). Both were congruent in their readings so I'm assuming this means that the digital one was adequately accurate compared to the analogue guage.
You slightly missed my point. The digital tyre pressure guages can be accurate, as you have found. However, they have two problems - when the battery starts to go flat, the reading can then start to vary - and this error can be worsened by cooler temperatures (just like watch batteries - take the watch off your wrist, leave in a cold garage - and the LCD display will be very sluggish). The other issue with digital ones is that they need to actually 'bleed' air out of the tyre to make a reading.
So, whilst they may be accurate, I would personally NOT recommend using them as your only source of checking tyre pressures - particualarly if you leave the digital gauge in a cold garage.
HTH
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I am sure when I had my tyres done a few months back the chap was speaking about this being the case?
Hmmmmmm . . . I doubt most tyre fitters would know the detail of how TPMS works - though they were correct in advising you of ramifications of rotating wheels around.
Ohh dear I didnt realise this would be a problem! What are the ramifications?[/quote]
If you swap part worn front tyres with virtually new rear tyres - then not only can the actual pressures be different, but more importantly for the Golf5 TPMS - the rolling radii will now have changed front to rear. If you don't re-check your pressures, and press and hold the TPMS button - then the TPMS will not be as reliable compared to before the wheel rotation.
HTH
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You slightly missed my point. The other issue with digital ones is that they need to actually 'bleed' air out of the tyre to make a reading.
So, whilst they may be accurate, I would personally NOT recommend using them as your only source of checking tyre pressures - particualarly if you leave the digital gauge in a cold garage.
Thanks TT. Didn't know they 'bled' air out to check the pressure. Both guages are kept in the boot of the car, so it shouldn't be freezing cold, I hope!