![]() 8b)For smaller tyres, subtract this number from 2278mm.Write this number down you will need it later when programming The Controller Area Network Module(CANM).” Divide this number by 1000 to get Your New Vehicle Speed Sensor’s Effective Circumference In Kilometers(km).This is now your new vehicle speed sensor’s “effective circumference.8a) For larger tires, add this number to 2278mm.This number is how much narrower your new tires are than your old ones in millimeters (mm).7b For smaller tires, divide your measured width by 25%.This number is how much wider your new tires are than your old ones in millimeters (mm).For larger tires, multiply your measured width by 25%.If you are calibrating for smaller tires, place the tire gauge on top of one of the lugs and measure down to where it meets the edge of the tire (include tread in this measurement).If you are calibrating for larger tires, place the tire gauge between the two lugs on the hubcap and measure the width of the tire at its widest point (do not include tread in your measurement).Place a block of wood behind one of the rear tires to keep it from rolling while you work on it.Unplug the speed sensor wire from its connector.The speed sensor is a small, black box with a single wire running to it.Locate the speed sensor on the transmission.Remove the negative battery cable from the battery to prevent any electrical shorts.Park your Ford F150 on level ground and set the emergency brake.The process is fairly simple and only takes a few minutes. Fortunately, there is a way to calibrate the speedometer for larger tires on your Ford F150. This can be frustrating when you are trying to obey the speed limit. If you have ever driven a vehicle with larger tires, you know that the speedometer is usually inaccurate. How to Calibrate Speedometer for Larger Tires Ford F150
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