In order to configure your tire size using FORScan, you will need a reliable OBD2 adapter. *Special thanks to the online community who have created the original resource This will update your PCM and get rid of the P160A DTCs that may appear when you change your tire size. Using FORScan, run the "Module initialization/Relearn vehicle data" procedure for the PCM ( also TCM if necessary). Speedometer MPH: 70 GPS MPH (tenths) : 80.0 Current Hex Value: 097c If line 726-12-01 reads xxxx 0856 xx for example, the 0856 would be your current value. The current hex value in your vehicle is found on the second block. Then use FORScan to read the hex value of your car for BCM line 726-12-01 and get your baseline. GPS will still provide a highly accurate reading for as long as your speed is constant. Normally, GPS won’t instantly provide your speed rather it shows your speed averaged over intervals. 75mph) while in cruise control on a leveled surface. Use the speedometer needle and have it dead center over an MPH hash at the highest reasonable speed (e.g. *x's mean leave the value that's already present.Īlternative/Optional Way to Fine-tune Tire SizeĬompare the speed indicated in your speedometer with the speed indicated in your GPS. Set BCM line 726-12-01 to the following using FORScan: Here’s how to do it using the Ford As-Built Tire Calculator and FORScan:Įnter the following details of your tire size (Mustang & F150 - Rear, FWD cars - front): Section Width, Profile, Rim Diameter
When changing your tire size, you need to fine-tune your programmed tire size so that your car will match with your particular tires.
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