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You can also use some sort of scantool (OBD bluetooth adapter on mine) and check the actual ECU speed, it is almost always different than speedometer. In my 4Runner, the difference is roughly 3 mph on any speed over 40 mph.Hey Guys,
Thanks for reading and responding. Still on ignore by Toyota, only had time to leave 3 messages this week for the gentleman handling my case. I was able to determine the SAE (Society of Automotive Engineers) Standard for Speedometer and Odometer Accuracy. Now this is an industry standard, but is not a law. The standard is J2976-201602. The "-201602" just means that it was last revised in February of 2016. The accuracy that the SAE standard calls for is:
Speedometer - .99 to 1.04 So 1% on the low side and 4% on the high side.
Odometer - +/- 2.5%
I have not proven the odometer to be off, we only monitored the speedometer on the chassis dyno. As for those with speedometers that are off, normally it is off by a percentage, not a specific MPH.
Hopefully this information helps others dealing with the same issue.
Thanks,
Wes
How much time and energy are you exerting on this issue? And what is the best possible outcome? Compared to the worst possible outcome?
so at maximum its only 3.6 mph off?