RTD Interface & MPVI2 – How to Calibrate the Speedo.

Step 1 – Plug up your RTD Interface and your laptop to your vehicle.

NOTE: You will be using VCM Scanner BETA (not the RTD Flasher) for this procedure, so open up that too.

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Step 2 – Connect to the vehicle by clicking on the Connect to Vehicle icon.

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Step 3 – Click the Vehicle Controls & Special Functions icon.

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Step 4 – Inside that box click on the Speedometer tab and select Speedometer Adjustment.

NOTE: If you get an empty window and do not have the option for the adjustment,  go to Vehicles>Vehicle Profiles>Vehicle Profile Editor. Then enter the code KTFK3A7 in the User OS box that pops up. Then continue on from here.

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Step 5 – You will not change the current gear ratio, just confirm the current size by typing in the box, then click “OK”.

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Step 6 – Enter the new tire height then click “OK”. If there are any other prompts, just click “OK” on them. That’s it. Done!

NOTE:

If you do not know your tire revs per mile, click here for a calculator that will do the figures for you. Tire Size Calculator

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