How to use FORScan to adjust tire size

[Nigel Chadee]

Can this be used to on a mazda 3, 2014 ,model?

[Nigel Chadee]

I don't see and bdycm in the configuration and programming section.
is there any special blocks for this?

[Ecmbuster]

@ Nigel Chadee
>>>> How to post correctly and help yourself
https://forscan.org/forum/viewtopic.php?f=5&t=24526

Include all details.

[Willfly4food]

I have a 2020 250
Default tire circumference was 2631
I was able to get it to take 2800
I have the nitto ridge grapplers 37x11xr20 measure to 36”

[ve3nsv]

This worked for me also. I was a few km/h off when putting in 2395 for my 255/55/19 tires but once I changed it to 2315 using this formula it's been bang on.

you have to x0,967 to get the correct data in mm after calculation... like mine 205/45R17 = 1935x0,967=1871 and this is for ford Fiesta MK8 from 2020
I enter 1870 and then its worked

[ddorans]

I have a 2020 250
Default tire circumference was 2631
I was able to get it to take 2800
I have the nitto ridge grapplers 37x11xr20 measure to 36”

Hi team - LOVE the site.

Making it quick - 2023 F350 6.7L HO Lifted and new tires and rims from stock to 37 X 13.5 x R22.
Speedo is off +8Km/h actual or (108) at 100Km/h indicated on dash
I did spend the time to READ the @zoodad (Rock star) threads and have tried to walk my way through the process however I keep getting the wrench and engine light when I change the Tire Circumference in the BDY module (English).

Original setting from factory = 2631

I looked to find the setting for my tire size and have tried 2941 but then realized many people are saying that is way too high, so I went to others who tried 2770, 2780.

I do the PCM TCM reset and clear DTC codes and still get Wrench etc.

Being a very JR user, get a bit scared to mess something up I put back to 2631, do the PCM TCM RESET (as there is no RELEARN) and Clear DTC's and it is fine.

I do not have "RELEARN" only RESET for PCM TCM - see attached. I have tried 2746,2770,2780,2799,2800. I'm positive there is a step I am missing,

Is there a number that has worked for similar and maybe 2023 is different? - @willyfly4food - did you change any other settings or just the tire circumference in the Bdy CM ?

Happy to take suggestions or advice from someone with same settings on same year?
Thanks!

[glen.sotheren]

you have to x0,967 to get the correct data in mm after calculation... like mine 205/45R17 = 1935x0,967=1871 and this is for ford Fiesta MK8 from 2020
I enter 1870 and then its worked

Can you please explain why the number .967 was applied. Ie. What is the significance of this number specifically. Many thanks

[Jtemple81]

I'm ready to pop my new tires, help!!!!!

I put on a set of 315/70r17's, largest on the size selection list, and went to adjust it in the BCM and it will not change it on my dash. I do not have a TCM but did the relearn of the PCM and still nothing. I started with 265/60r18 then changed the wheels and tires, now I'm off 5-6 mph. Anyone have any suggestions? TIA

2013 F-150 single cab 5.0

[Mobiletech]

Thank you for the detailed instructions. I am working on a 2024 F550 with 305/70/R20 tires. I performed the BCM tire circumference adjust and the PCM, TCM and AWD module vehicle data relearns. I did not receive the message "tire circumference parameter is out of range for this module" in any of the 3 modules. The AWD and TCM complete successfully but the PCM dues not. It reads "Service procedure has been interrupted" at the end of the relearn. I attempted the relearns of the 3 modules in varying orders. I now only have the code P160A:00-2F in the TCM, even though it's relearn completes properly. Any ideals? Thanks for your time.

[trebron59]

Hi,
We own a Transit V363 / 2022 and it is 5% off in Speed against GPS.
I have tried to change the values in BCM and in PCM and did the relearn in PCM.
TCM relearn doesn‘t work. I contacted support about it and they mentioned it is not supported / needed for my car.

Regardless what value I store in BCMii, the 5% doesn‘t change.

Any help is welcome