Any Way to Change TPMS Settings???

[pa-outdoorsman]

I’m running 245/70/17 tires on my lifted truck. Proper inflation for these tires on my Maverick is 27 psi. Problem is the truck gives me a constant low tire pressure warning.

I can clear that by adding more air but the ride is so much better at 27 psi than 35 psi I really don’t see that as a permanent fix.

I tried to make some changes to the TPMS settings in the BCM module but the system wouldn’t accept any of them when I tried to write the changes.

Anyone with more FORSCAN knowledge than me know if this can be done and how to do it?

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[SiGmA_X]

How'd you calculate the PSI for your tires?

 

[pa-outdoorsman]

There's an online calculator here:

https://tiresize.com/pressure-calculator/

 

[Darnon]

There may be a minimum pressure that it accepts. If you can get it to accept 30 or 32 that should be in the ~25% margin before it'll trigger. That or since I assume you're using the plain-text setting menu you may need to try entering it as the hexadecimal value (1B) in the appropriate as-built fields.

 

[pa-outdoorsman]

There may be a minimum pressure that it accepts. If you can get it to accept 30 or 32 that should be in the ~25% margin before it'll trigger. That or since I assume you're using the plain-text setting menu you may need to try entering it as the hexadecimal value (1B) in the appropriate as-built fields.

I played around with the plain text menu in the BCM configuration, but it wouldn't accept anything. I can go into the "as built" area, but I don't know what all the numbers mean. I do feel comfortable changing something, but I have to be certain I'm changing the right field.

Can you give me some additional details on what you are talking about in terms of "hexadecimal value (1B)"? If it is as easy as entering a lower number for the minimum tire pressure threshhold, I think I can do that. Again, just need to be sure I'm messing with the right line of code.

Thanks!

 

[AVC]

DItto; anyone in Forscan come across the module section that sets the TPS "low pressure" threshold? I do know that there is considerable hysteresis built into the threshold; i.e.. 28PSI on my hybrid appears to trigger low pressure warning, but it has to be inflated to about 32PSI to clear the warning on that wheel.

 

[paneubert]

Are you willing to just disable the TPMS warnings completely? I believe that is an option in ForScan.

 

[Carlitos_92]

I do know that there is considerable hysteresis built into the threshold;

I can't add anything of value here since I run my tires at over 35 psi rather than under - but that's the first time I've seen that word on a car/truck forum. Nice!

 

[The Real Maverick]

For the record.....

I've gone up to 50 psi and found no HIGH pressure warning.

 

[AVC]

Are you willing to just disable the TPMS warnings completely? I believe that is an option in ForScan.

I do want the pressure warning, but to trigger at say 27psi, as I typically run about 30 PSI cold for the 90% condition of just me, for daily commute and errands. I have to pump to 31/32PSI to get the warning off. For the MUCH improved ride quality, I gave up some crispness in steering response. Undetectable change in MPG. The tires are also wearing very evenly.

 

[AVC]

I do want the pressure warning, but to trigger at say 26/27psi, as I typically run about 30 PSI cold for the 90% condition of just me, for daily commute and errands. I have to pump to 31/32PSI to get the warning off. For the MUCH improved ride quality, I gave up some crispness in steering response. Undetectable change in MPG. The tires are also wearing very evenly.

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