Speedometer incorrect 2019 4Runner

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offkamber
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Posts: 2
Joined: Tue Oct 22, 2019 7:09 pm

Speedometer incorrect 2019 4Runner

Post by offkamber » Tue Oct 22, 2019 7:30 pm

I have 34" tires in my 4Runner. When I was doing some testing this is what I got:

79 MPH on cell phone speedometer (most trusted and used 2 cells with 2 different apps to compare)
75 MPH on Toyota dash speedomter
73 MPH on Alpine ILX-F309FRN head unit using Maestro kit.

Initially I though that the Maestro was getting speed from the vehicle speedo... but I noticed it is 2-3 MPH less than the factory Dash.

So my question is where is the Maestro getting it's speed reading from and can I adjust it? I would like for it to at least match the factory dash... but would be better if I can adjust it to match actual speed due to tire sire increase.

Photos of problem in action can be seen here (Post 8): https://www.toyota-4runner.org/5th-gen- ... tment.html

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Zack Flynn
ADS Team
Posts: 744
Joined: Mon Dec 12, 2011 9:46 am

Re: Speedometer incorrect 2019 4Runner

Post by Zack Flynn » Tue Oct 22, 2019 7:47 pm

The RR gets the vehicle speed from the diagnostic protocol at the OBD2 connector. Whatever value is sent to us from the vehicle ECU is what is displayed. Unless you can use a factory scan tool to change that, it is unlikely that you will be able to change that value. Most vehicles read within a few percent of actual vehicle speed, which is all the standards require.


https://www.thrillist.com/cars/your-spe ... anese-cars
Zack Flynn
Automotive Data Solutions
Technical Support & MECP Master Installation Technician
Zachary.flynn@adsdata.ca

offkamber
New User
Posts: 2
Joined: Tue Oct 22, 2019 7:09 pm

Re: Speedometer incorrect 2019 4Runner

Post by offkamber » Tue Oct 22, 2019 9:31 pm

Is there any way to get an update for Maestro to read the speed from a GPS sensor vs factory OBD?

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Dara DeGrand
ADS Team
Posts: 6344
Joined: Mon Dec 02, 2013 1:34 pm

Re: Speedometer incorrect 2019 4Runner

Post by Dara DeGrand » Wed Oct 23, 2019 8:19 am

Unfortunately, no. The gauges page pulls exclusively from the data lines of the vehicle; re-coding it to pull from a different place isn't possible.
Dara DeGrand
Maestro Technical Support Manager
Automotive Data Solutions Inc.
8400 Bougainville, QC
T 514.807.2888
TF 866.427.2999

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