Indirect TPMS
- Thread starter Howzat
- Start date
ABS Long Coding, Hill Descent Control, Tyre Pressure Monitoring
Here is a couple of nuggets for everyone: How to active Tyre pressure monitoring TPM (PR 7K9) How to active Hill descent control on 4Motion vehicles (PR UG5) Of course with UG5 the hill descent switch must be installed and wired to the ABS CU to activate. TPM activation is purely just software...
That's an interesting question - my guess is the TPMS handles each tyre (or perhaps axle) separately thus it should work just fine.
Agreed, as it works of the ABS sensors after you press the save button it measures the rotation ratio between the wheels and stores it then will alert you if theres any deviation from this ratio, i assume there is a ratio tolerance that you must be within but plenty of people run staggered and oversize setups etc where there is differences in aspect ratio so i think you will be fine
Indirect TPMS monitors the actual speed of all 4 wheels. The system learns the speed pattern/variation within first 20km(approx) after the reset.
Then if one of the wheels looses some pressure its effective diameter reduces and therfore its speed increases.
This speed increase in relation to the other 3 wheels normal(same) speed is detected and indicated accordingly in Instrument Cluster.
I did a test with a diffrent tyre profile on a rear axle of my Sharan 7N(PQ35).
Approximately every 20km my TPMS was indicating a fault and I had to reset it over and over.
I am pretty sure T6 MK100 is going to behave the same(happy to be proved wrong).
Then if one of the wheels looses some pressure its effective diameter reduces and therfore its speed increases.
This speed increase in relation to the other 3 wheels normal(same) speed is detected and indicated accordingly in Instrument Cluster.
I did a test with a diffrent tyre profile on a rear axle of my Sharan 7N(PQ35).
Approximately every 20km my TPMS was indicating a fault and I had to reset it over and over.
I am pretty sure T6 MK100 is going to behave the same(happy to be proved wrong).
Panel van Tyre pressure monitor enable.
Can't believe that Panel vans don't come with the flat tyre warning enabled- its surly a good safety feature with no downside at all. Kombis come with this as standard the Panel vans don't as VW charge £60 as an option !! Considering that all the hardware is already fitted Its £60 to change...
I'm using OBD11 so for anybody else........
Went into 03 ABS then in byte 15 bit 4 there's 2 tick boxes. 1 for TPMS enabled with reset via switch and the other for TPMS enabled with reset via MFD.
Selected the MFD option then hit apply and my ABS lights and Tyre pressure warning lamps lit up on the MFD.
Didn't need to code anything else.
Found the tyre pressure option in the MFD and reset the pressures and all the lights went out.
Will see how it goes over the next few days.
Thanks again everyone for the help.
Went into 03 ABS then in byte 15 bit 4 there's 2 tick boxes. 1 for TPMS enabled with reset via switch and the other for TPMS enabled with reset via MFD.
Selected the MFD option then hit apply and my ABS lights and Tyre pressure warning lamps lit up on the MFD.
Didn't need to code anything else.
Found the tyre pressure option in the MFD and reset the pressures and all the lights went out.
Will see how it goes over the next few days.
Thanks again everyone for the help.
Hoping someone can help me on this. I activated it ages ago on my startline but have no mfd or button to reset. Had a puncture this week and the light came on dash as expected. But when I’ve gone into obd11 I cannot erase the fault. Or find a way to reset the light on dash. So I’ve disabled it for the time being. Wondering if it’s a case of driving it and it’ll clear again? Here is a picture of the fault on obd11.
Cheers
Cheers
Just for anyone in the same boat. To clear it I changed long coding back to original, cleared the fault in obd11 then did the long coding again to activate.
Done about 80 miles since activating indirect TPMS and no errors or reset requests have popped up so it seems OK with my ever so slightly different profiles on the fronts v's the rears. I guess it logs each individual wheel rotation v speed and pings when one changes. We shall see, but hopefully not.
It’s not a great system. I’ve had it on my golf where two tyres went down and it didn’t pick it up because it was two at the same time. Must compare them against each other ¯\_(ツ)_/¯
What is the exact size of your
front(265/??R??) and rear(275/??R??) tyres?
Only 1.4% in overall diameter difference,
so I guess within system limits/tolerance.
Tyre Size Calculator
A better easy to use tyre size calculator. Use our tyre size calculator to find tyre diameter, width, sidewall, circumference, and revolutions per mile.
My experiment was performed on
225/50R17 vs 225/45R17,
resulting with 3.5% diameter difference.
Concluding, the fault indication threshold must be somewhere above 1.4% in a diameter difference.
That is how it works. It monitors wheel speed from the ABS sensors. If a difference between wheel speeds is detected, it presumes that is due to the tyre rolling radius changing, ie a deflating tyre, and activates the warning.
It is important to reset the system whenever you adjust the tyre pressures, even by a small amount. The change in the sensed rotation and any tyre tread wear can be enough to trigger the alert.
This was years ago on my mk5 but I’m sure it was diagonal
What model year Golf?
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