I adjusted the values in my BCM to adjust the speedo to account for a larger diameter tire. Once complete the little wrench appeared stating that I needed to check my owner's manual. Other than the BCM, whas there another adjustment I needed to make?

Not sure what I did wrong but would like to undo it. How do I restore all values in forscan?

 

https://www.f150forum.com/f118/forsc...-truck-348987/

 

Check the BCM sheet in the FORScan spreadsheet. There is info there that is probably relevant.

 

THANK YOU.. Problem resolved..

 

Can you provide explanation for those who might look to your post later?

 

Good morning. Yes of course.
im still new to FORSCAN and was very hesitant to use any other feature other than the save all and write all.

Luckily I took everyone’s advise and saved all the original values in a separate folder.

I selected load all from the stored original settings And the issue disappeared. I then went back and changed one value at a time to see at what point I’d experienced the issue again and it seems that when changing the speedometer to compensate for a larger Wheel diameter it triggers an illuminated “wrench” symbol.

Im hesitant to try again unless someone here has a proven method that will not generate a fault of any kind

i changed my tire size to 295/60/20 and at
60mph I’m plus 2mph faster gps speed
70mph I’m plus 3mph faster gps speed

 

People adjust the Speedo calibration all the time with no issues. Can you post what you changed. Maybe both as built and your new ?

 

The instructions are in the spread sheet, OP missed it as an oversight. The instructions are linked literally right next to the address in the spread sheet.....meaning if you know where to go to know how to change tire size, the instruction is right next to it stating to do this if you get a wrench light.

On 2017 and newer you need to write to the PCM (instructions in the link in the spread sheet show you how to do it)
I changed values in my early 2016 and did not have the wrench light but I understand it may have affected some 2016 models.


PRO Tip:
Save the as-built information as previously mentioned (which OP has done here).
Change whatever you want in a module, could be many different features.

If/when something goes bad, do as OP indicated and 'load all' (that restores all items in that module from the original configuration).
However, you probably know which address you are now suddenly finding an error with (if it was the last changed item). In this case lets use 726-12-01 (tire size) as example.
Simply 'write' the values for that one (no need to write all).
This method will NOT overwrite the other changes made to that module once you exit that module.
It's nice tip to restore a particular setting to stock, but not disrupt every other setting in there.

For instance, if I load all body control module data to restore my tire size error and write all, I will have ruined my folding mirrors and global windows data.
Using my method, using 'load all', then only writing data for 12-01, my folding mirrors and global window entries would be untouched.

 

JAMIE,

The original value was 099E and I changed it to 0A08, and that's when the issue occurred. Although the GPS reading and speedo were pretty much synced, i didn't care for the illuminated wrench icon on the dash and felt I screwed something up.

 

16Ingot,
I'm still new to the forum and forscan as a whole. I've had my truck less than a month and still learning all the tricks of there trade. I downloaded a spreadsheet from a popular YouTuber that seemed to have all the "cool" hacks.
I've never seen the print out above, but now I wish I had. Sorry not sure who or what OP is.Where can I find the spreadsheet with the information above?