hey guys, I don't post often tend to keep to myself but always spend hours on here reading and learning and searching but am in need of some help if someone has been through the same issues before!!
This winter/spring I built up my 2012 jku Sahara with junk yard one tons
2003 GM 14 bolt with 5.38s
2007 HP60 ford sueprduty with 5.38s
theres lots more like 3 link long arms oris, lockers steering rolling on 42" SX2 blah blah blah but that's not what my problem is haha
The stock JK uses 52 tooth tone rings for the abs last year my jeep ran stock axles built up with 5.13s and 37's and I used my pro cal to calibrate my speedo and shit (which for some reason this year will NOT work to reset to factory just get blinking red light on dash horn wont honk very stupid)
The new setup is rocking factory ford sueprduty wheel bearing which are infact 60 tooth tone rings inside and I am running dodge ram abs sensors as they plug right into the ford bearings!
so to sum it up:
Last year 52 tooth tone rings with 5.13s and 37
this year 60 tooth tone rings with 5.38s and 42s
Old program from last year stuck in computer Procal will not allow me to change anything so its going in the garbage not impressed with their service.
The jeep is currently stuck in what I am guessing is a "limp mode"
jeep is an automatic 5 speed with trip tronic, currently the trip tronic will not work and the jeep is not shifting gears correctly it is like stuck in 2nd or 3rd doesn't want to shift from forward to reverse and shit...
Was thinking I can limp it to the dealer friend works there and he can wipe my computers and flash factory up to date software on the jeep quick and I bought a superchips programmer to teach it the new setup..
I do have a check engine light to go with this issue which is a freeze frame and will not allow me to remove it with my code reader at home and it is a P0731 "gear ratio error in 1st"
what I am failing to understand is how this error can come about? weather I put 49s or 31s on the jeep or 3.73 or 5.38 how can that put the jeep in limp mode? the jeep sees pulses from the abs sensors correct? those pulses then give the speedo a read out correct? so by changing the tire size and gear ratio the speedo will be off by a lot but the jeep should drive and shift fine correct?
Maybe I don't fully understand the abs system and someone can educate me further? I understand its now seeing 60 pulses per revolution instead of 52 pulses which will throw things off is this causing my limp mode??
How are some of the builds I rear guys are telling the computer they have 33s with 4.10 gears to get their speedo right and not going into limp mode??
I drove the jeep in limp mode with my gps on and my speedo is within 2mph to my gps but the jeep is in limp mode...
Also I should state I tied my back 2 abs sensors into my front two sensors as I have read many guys do this too...
starting to wonder are all these builds on old jks and on standard jks so no one has issues?
can anyone help? if you need more info to help diagnose just ask! I clearly need a better understanding of the system to trouble shoot and fix it.