Ford tire size configuration / recalibration for larger tires?

[jspa]

Don't the other modules need to be forced to learn new input

yes, I believe that is the case, however the "module initiation/learn vehicle data" module does not show up in the menu on Forscan for me. Not sure if that is a forscan issue or a Ford Maverick issue.

Thoughts?

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[Chris_G]

yes, I believe that is the case, however the "module initiation/learn vehicle data" module does not show up in the menu on Forscan for me. Not sure if that is a forscan issue or a Ford Maverick issue.

Thoughts?

No, hopefully someone has already successfully done it.

 

[jspa]

No, hopefully someone has already successfully done it.

Im gonna do some more searching. I might start a new thread if I don't uncover a solution.

 

[Chris_G]

Im gonna do some more searching. I might start a new thread if I don't uncover a solution.

Sorry I wasn't much help.

 

[jspa]

I appreciate the effort.

 

[ATL_Mav]

Were you able to mess around with this any more? I am trying to adjust mine using forscan and I am getting AWD errors (DTC codes) for any value I input with the exception of the original number. I am interested to see if there are any workarounds to not get these errors and fix the speedo.

Thanks!

No I have been slammed at work, plus after checking it with GPS it's only off by about 1 to 2 mph at higher speeds so I'm not as worried about it.

 

[Maverick2022XL]

yes, I believe that is the case, however the "module initiation/learn vehicle data" module does not show up in the menu on Forscan for me. Not sure if that is a forscan issue or a Ford Maverick issue.

Thoughts?

Depends which version. If you are getting P160A DTC errors you need to do a an adaptive relearn for the modules in question. Also some of the earlier 2.34.7 betas do not read the AWD module correctly or can even do a module reset with it.

You need a test version FORScanSetup2.3.47.test20220220.exe or later which has the adaptive relearn functions for the PCM and AWD modules and a bunch of fixes for the AWD module including the ability to correctly do a module reset and read the actual module addresses correctly.

https://forscan.org/download/FORScanSetup2.3.47.test20220307.exe

That is one of the most current betas and has all this in it including other fixes for Mavericks.

 

[Maverick2022XL]

I've played around a little bit with this myself and for tire circumference, it is also tied to the tire type which I believe but have to double check is in the ABS module. If you use any circumference other than what is stored for those tires you'll also get a bunch of errors elsewhere. I'll have to look more into it to see if there is a generic code for rim size and / or tire tread aka A/S vs. A/T that can be used in conjunction with a custom tire circumference setting in the BCM.

As far as the circumference setting. Once you know what it is in MM. The ones on the stock XL are 225 65/R17 A/S tires and translates to 2273 MM using an online tire calculator site or 08E1 in hex. The actual addresses that a Maverick uses are the following

BCM
726-04-04
xxxx-xxxx-**xx
This line gets the first 2 digits and in this case ** = 08

726-04-05
**xx-xxxx-xxxx
This line gets the last 2 digits of the tire circumference in MM translated to hex and in this case ** = E1

You can double check your default settings before doing any changes to verify by taking those 2 values combining and convert the number to decimal. Take that 4 digit decimal number and compare it against the easy mode value for tire circumference. They will match up exactly.

 

[Maverick2022XL]

To do the actual calculations here by hand for example using 225 65 / R17 as your tire size.

First we need to calculate the sidewall height which is (profile ratio * width) / 100

That value will be in mm.

SH = (65 * 225) / 100 = 146.25 mm

Next we need to calculate the tire diameter.
First we need to convert the rim size into mm.
To convert any value from inches to millimeters and vice versa
X inches * 25.4 = Y mm
conversely
Y mm / 25.4 = X inches

rim = 17 inches * 25.4 = 431.8 mm

Second the actual diameter which is rim size + (2 * sidewall height)
tire diameter = 431.8 mm + (2 *146.25 mm) = 724.3 mm

Finally the actual tire circumference is
C = tire diameter * pi
C = 724.3 mm * 3.14159 = ~2275.45 mm

 

[jspa]

Depends which version. If you are getting P160A DTC errors you need to do a an adaptive relearn for the modules in question. Also some of the earlier 2.34.7 betas do not read the AWD module correctly or can even do a module reset with it.

You need a test version FORScanSetup2.3.47.test20220220.exe or later which has the adaptive relearn functions for the PCM and AWD modules and a bunch of fixes for the AWD module including the ability to correctly do a module reset and read the actual module addresses correctly.

https://forscan.org/download/FORScanSetup2.3.47.test20220307.exe

That is one of the most current betas and has all this in it including other fixes for Mavericks.

oh fantastic! I will give that a shot. Thanks for the info!

 

[HiYoAu]

To do the actual calculations here by hand for example using 225 65 / R17 as your tire size.

First we need to calculate the sidewall height which is (profile ratio * width) / 100

That value will be in mm.

SH = (65 * 225) / 100 = 146.25 mm

Next we need to calculate the tire diameter.
First we need to convert the rim size into mm.
To convert any value from inches to millimeters and vice versa
X inches * 25.4 = Y mm
conversely
Y mm / 25.4 = X inches

rim = 17 inches * 25.4 = 431.8 mm

Second the actual diameter which is rim size + (2 * sidewall height)
tire diameter = 431.8 mm + (2 *146.25 mm) = 724.3 mm

Finally the actual tire circumference is
C = tire diameter * pi
C = 724.3 mm * 3.14159 = ~2275.45 mm

I'm watching this as I'm interested in whether it's worth it to update my configuration to match my newly installed wildpeaks.

The tire circumference value, as delivered, stored in my BdyCM module for the factory installed 225/65R17 A/S tires is 2251mm (a 1% difference).

Peeking into the ABS module, and looking at the selectable tire sizes, there are 4 to choose from and match the different tires offered. Does the circumference stored in the BdyCM module have to be close to the calculated values for the selectable tire size?

I'm sort of curious to see what the tire circumference values were used with other members vehicles as delivered from the factory.

But as I write this, it strikes me that the Ford guys, to be practical, may have used a circumference value that was representative of the mid-life of a tire to factor in the reduction in diameter due to wear.

How good is good enough?

 

[Maverick2022XL]

I'm watching this as I'm interested in whether it's worth it to update my configuration to match my newly installed wildpeaks.

The tire circumference value, as delivered, stored in my BdyCM module for the factory installed 225/65R17 A/S tires is 2251mm (a 1% difference).

Peeking into the ABS module, and looking at the selectable tire sizes, there are 4 to choose from and match the different tires offered. Does the circumference stored in the BdyCM module have to be close to the calculated values for the selectable tire size?

I'm sort of curious to see what the tire circumference values were used with other members vehicles as delivered from the factory.

But as I write this, it strikes me that the Ford guys, to be practical, may have used a circumference value that was representative of the mid-life of a tire to factor in the reduction in diameter due to wear.

How good is good enough?

2251 mm is the same diameter on mine also according to forscan. It could also be due to how the MPG is calculated by the computer not just an average circumference size based upon the no to max tire tread wear.

 

[Maverick2022XL]

I think I know where they are getting the 2251 mm number from. The 2273 or 2275 mm depending how you calculate it is the unloaded weight circumference. Once you put weight on the tire it will distort some. Usually the number used is .96 * tire circumference. In this case I am guessing they are using a value somewhere between ~98.9% and ~99.03%

 

[SiGmA_X]

Has anyone been able to successfully recalibrate the tire size?

 

[MaverickSurprise]

Nice information in this thread. FYI. My Maverick Lariat FX4 that I bought a few days ago had Pirelli Scorpion 225/65 r 17. Using Forscan, the circumference entry stock was 2230mm. After purchasing 245/70 r 17 tires, I was hoping to correct the 7 percent speedometer error but could not. The maximum number I could enter into the Maverick without the "out of range" error was 2269. Addmittedly, I got tired of trying numbers and running the PCM learn and then AWD learn, etc. 2274mm failed and 2269 worked. Didn't try the numbers in between them. This corrected my speedometer pretty well, still says 40mph when I am going gps 41mph and 70 mph when I am going 72 gps. But this is much better. Not sure why Maverick has such a limited range. I wanted to go up near 100mm in size but could not. Saw a Bronco video where they were going up 350mm in size successfully.

Stock, the speedometer was about 1mph off for most things, probably actually a percentage off. for instance, said 30mph and I was going 29.

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