Re: Tire size/Speedometer accuracy
"The speedometer receives wheel speed data from the CAB via the CAN data bus"
So it is coming from the antilock braking module and probably a meld of all four wheel sensors plus steering and lateral acceleration factors. We would need to know the ABS programming to know which is chosen in the event of a mismatch or what fudge factors are thrown in and when.
Computer may use other sensors but that is where the speedo gets its signal.
Last edited by Padgett; Dec 27, 2013 at 09:17 PM.