I think the Tazer resets the ESS AFTER the vehicle is started. In other words, when the vehicle starts, it looks at the condition of the the ESS when you last shut it off and then sets it that way. Jscan may be permanently setting it to off and that could make the difference.
I put BFG KO-2 285s on my JT Sport. The BFG spec was 32.8 inches and I ended up having the Tazer set to 32.79 (Tazer does oddball numbers for some reason) to get the speedo to match my GPS.
Had the TSB done on Aug 26. It was a good and bad experience.
The good:
After the replacement, It was everything I had hoped for. No more pull to the right and no more "sloppy steering" and wandering down the road.
The bad:
I had an 8:30am appointment and dropped it off at 8:20am. Lucky for...