ForScan hurdles when updating tire circumference

[baztien.xplrz]

Hey all!

Hoping to get some advice here with some hiccups I'm running into when attempting to update my tire size via ForScan. I've recently upgraded my stock 225/65/17 (2202mm circum) to 245/65/17 (2357mm circum) -- calculated circum via two different online tire calculators. I was able to successfully write in the new circumference and that's when the expected AWD error + orange service wrench came up on my dashboard and DTC PCM alerts came up on ForScan.

I followed the directions noted here (https://forscan.org/forum/viewtopic.php?f=16&t=15994&sid=2c2e7131453abf2d477a5b00351ca3f8)
to relearn the PCM vehicle data. I also found this thread (https://www.broncosportforum.com/forum/threads/speedometer-calibration-with-larger-bigger-tires.1992/page-3#post-159972) that suggests to relearn the AWD module, however I noticed AWD module does not show/exist under my list of DTCs.

I am using ForScan v2.3.55 and Vgate vLinker FS OBD2 USB Adapter to try and make these changes.

I am wondering if I need to use a previous version of ForScan (perhaps v2.3.4 ?) or a different OBD adapter? or if AWD module is under a different acronmy?

Appreciate any help getting over these bumps ?

 

[Dude]

I read this on bronco sport forum:

Example ECU settings for:
22565R17: 2202
24565R17: 2232
Bandlands, Falken Wildtrak AT3W (245/65/17) tire circumference: 2354mm (original value 2202)

 

[Gapbriel]

I read this on bronco sport forum:

Example ECU settings for:
22565R17: 2202
24565R17: 2232
Bandlands, Falken Wildtrak AT3W (245/65/17) tire circumference: 2354mm (original value 2202)

And for 23565R17 should be 2230 ?

 

[Dude]

And for 23565R17 should be 2230 ?

Can’t say this is correct but ChatGPT has this to say:

Here’s the breakdown:
• 225/65R17 → circumference ≈ 2275 mm → ECU value 2202
• 245/65R17 → circumference ≈ 2357 mm → ECU value 2232
• 235/65R17 → circumference ≈ 2316 mm (in between the above two)

Since 2316 mm falls about halfway between 2275 and 2357, the ECU value should interpolate between 2202 and 2232.

The best estimate for 235/65R17 is ≈ 2217.

 

[Dude]

And for 23565R17 should be 2230 ?

And to add more to the prior answer:

The community consensus is that 2202 is commonly reported as the factory/configured value for 225/65R17 on Bronco Sport, and 2232 is a commonly reported FORScan value used for certain 245/65R17 tires after owner calibration. 
• Users frequently tweak the number against GPS (and some report final calibrated numbers like 2242), so a single value can vary by brand, load, pressure and how the owner calibrated it. 

ChatGPT recommendation (practical)
• Treat 2202 / 2232 as community-reported FORScan values — useful starting points, but verify on your vehicle using GPS as other owners have done

 

[Gapbriel]

I use 2230
I asked chat gpt and it’s better .. 2230 use maverick … thanks my friend

Sponsored