Using AlfaOBD on a 2022 Fiat Ducato Series 8 no matter what values I enter for the tyre pressures I still get told that they are outside of the allowable range. Is there any way of determining what the allowable range is or bypassing this message?
Technical Unable to change TPMS pressures with AlfaOBD
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Technical Unable to change TPMS pressures with AlfaOBD
theoneandonly
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I'm afraid you have a SGW that blocks 2 way communication. You will need to go the official route.
I've found and bypassed the SGW and have been able adjust other settings including a proxy alignment. It's just this one which won't play ball.
theoneandonly
Established member
Well thats almost good news.
Yes, but considering that changing the TPMS pressures was the main thing that I wanted to do then perhaps not so good news.
So who set the TPMS to 80 psi, that's not the Fiat standard TPMS settings so it must have been done by the campervan people. Might be worth asking them how they did it. If you find out please let me know.
Otherwise no solution as yet, the general consensus of opinion seems to be that the settings are in the RFHUB (Radio Frequency Hub Module) but AlfaOBD won't let me adjust them and MultiEcuScan doesn't support this module.
I asked my local Fiat dealer to locate and change the settings but they said that they couldn't find them although I don't think they looked in the Radio Frequency Hub Module.
The Fiat recommended tyre pressures for my 2022 Fiat Ducato are 4.5 bar front and 5.0 bar rear or 65.0 psi front and 72.3 psi rear on Continental VanContact 4Season tyres. I've worked out by trial and error that the TPMS warning set points are set at 80% of these values. So I've been using cold tyre pressures of 55 psi front and 62 psi rear which improves the ride and doesn't give any TPMS warnings.
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theoneandonly
Established member
Yes, but everything changed for the Ducato Series 8 (2022+) and the TPMS isn't available separately as you've shown. It's now supposed to be in the RFHUB which isn't supported as in the MultiEcuScan report below.
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theoneandonly
Established member
Well then i'm one of the lucky ones with a 2017 twin egr model no SGW no TPMS (other than Tyrepal) no blocked LPEGR cooler yet and a Multiecuscan that works. Unfortunately with no actual newer model on my drive i have to resort to the simulate mode.
Agreed, newer is not necessarily better, as I am finding out.