OBD JScan to Adjust Wheel Size - JeepForum.com
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post #1 of 7 Old 03-09-2020, 10:19 AM Thread Starter
Tgrichards
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OBD JScan to Adjust Wheel Size

I have an OBDII iCarPro device and OBD JScan App on my iPhone. I can plug the OBDII into the socket and using AutoDoctor Pro scan the engine. But, so far, I can't find my way into the setting for the Wheel/Tire Size via JScan.

Any help?

Thanks!

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post #2 of 7 Old 03-09-2020, 01:45 PM
Jeep_Meister
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Just bought the same setup but haven't tried it out yet. Subscribed.
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post #3 of 7 Old 03-09-2020, 08:55 PM Thread Starter
Tgrichards
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Responding to my own post I guess, just so everyone has the answer: I used an iCarPro ELD327 adapter and OBD JScan on my iPhone. And through that matchup I was able to reset the Tire Size in the ECU.

I am still struggling with a TPMS problem; the light stays on and I can't figure out why. I have a couple calls to make in the morning, to answer questions as I move forward.

Thanks, all!
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post #4 of 7 Old 03-11-2020, 01:06 PM
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Curious what changed (MPH, transmission shift point, etc.) once you changed wheel size. My speedometer is running about 2 or 3 MPH slower than GPS which has been verified accurate already. I have a 2" lift with 33" tires and will be doing some tweaking this weekend.
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post #5 of 7 Old 03-12-2020, 08:05 PM Thread Starter
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Change the tire size...

Quote:
Originally Posted by Jeep_Meister View Post
Curious what changed (MPH, transmission shift point, etc.) once you changed wheel size. My speedometer is running about 2 or 3 MPH slower than GPS which has been verified accurate already. I have a 2" lift with 33" tires and will be doing some tweaking this weekend.
I managed to change the tire size through the iCarPro/OBD JScan combination, and now my speedometer and GPS agree.
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post #6 of 7 Old 04-01-2020, 08:59 AM
Jeep_Meister
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Originally Posted by Tgrichards View Post
I managed to change the tire size through the iCarPro/OBD JScan combination, and now my speedometer and GPS agree.
I was able to do the same using these two tools. Speedo and GPS are in sync now! My TPMS is off also. I'm running around 33 PSI but dash says 40 or 41! Seems like there is a "Pro" version needed to deal with TPMS? Not sure.
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post #7 of 7 Old 05-16-2020, 05:34 PM
sprkeng
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I received my Vgate iCar Pro WiFi for Android last Friday.

Bought the license for $22.99

This morning I changed the tire size to 34.3, TPMS down to 26psi and disabled day running lights.

I didn't buy the Bluetooth version since I've read that it's not advised for Android works best with iPhone

2011 Wrangler JK Sport
All Standard Stock 6 Speed Transmission
2.5 lift new Bestop NK softop
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