42rle adaptive learning reset?

[tdamocles]

42rle adaptive learning reset or reprogram?

I've just bought a used 04 Liberty Rocky Mountain edition with 17k miles and love the car but with one concern: It's shifting. When driving up a hill the trans seems to upshift to a higher gear when it is not needed. I then need to mash the peddle for a downshift for it not to bog down. From what I read on the 42rle trans it learns shifting habits. Is there a way I can do a nice fresh 'reset' for the adaptive learning so it can relearn my habits? Is this possible?

 

[Vtolds]

I dotn know about the liberty or jeeps but computer Resets on a Hyundai are unhooking the battery for at least 15 minutes and hitting the brake peddle to discharge any left over energy. Then you drive the car like you stole it for 30 minutes and your set. Of course that is Hyundai not Jeep.

 

[_UnLiMiTeD_]

that is just a regular problem for those ******'s. they always want to shift to a higher gear when going up a hill. Mines done it since the day i got it and so does everyone elses

 

[tdamocles]

that is just a regular problem for those ******'s. they always want to shift to a higher gear when going up a hill. Mines done it since the day i got it and so does everyone elses

I guess one could not have it reprogrammed to not upshift?

 

[flair1111]

I guess one could not have it reprogrammed to not upshift?

im wondering the same thing but cant find the answer. i did have mine reflashed for a weak reverse problem but the forward gears still shifted the same.

 

[tdamocles]

I guess one could not have it reprogrammed to not upshift?

Let me restate.... Could one have it reprogrammed not to upshift so quickly?

Flair, Looks like you understood me anyway....


Is there any Jeep techs in here who would know?

 

[JeepJeepster]

Normal, they do it to try and save gas and to annoy the heck out of me.

Never heard of anyone getting a flash but I would love to know if there is one.

I frequently use the O/D off button on back country roads.

 

[tjkj2002]

Let me restate.... Could one have it reprogrammed not to upshift so quickly?

Flair, Looks like you understood me anyway....


Is there any Jeep techs in here who would know?

Transgo makes a shift kit for the 42RLE that corrects that problem,it's cheap and easy to do also.

Also you can take your KJ to a dealer and have a ****** quick relearn done.

_UnLiMiTeD_that is just a regular problem for those ******'s. they always want to shift to a higher gear when going up a hill. Mines done it since the day i got it and so does everyone elses

You need to stop saying that everyones does that,not everyones does it,mine certinally doesn't and I now many others that don't and with both trannies,the 45RFE and 42RLE.I has alot to do with how you drive,if you drive like a old lady it will shift that way,if you drive it like a guy(with some balls) it won't shift that crappy way since the ****** "learns" how you drive,it's not going to "learn" overnight also,it takes about a week of the same style driving for it to "relearn".So switching driving styles everyday will confuse the ******.

 

[flair1111]

Transgo makes a shift kit for the 42RLE that corrects that problem,it's cheap and easy to do also.

Also you can take your KJ to a dealer and have a ****** quick relearn done.

You need to stop saying that everyones does that,not everyones does it,mine certinally doesn't and I now many others that don't and with both trannies,the 45RFE and 42RLE.I has alot to do with how you drive,if you drive like a old lady it will shift that way,if you drive it like a guy(with some balls) it won't shift that crappy way since the ****** "learns" how you drive,it's not going to "learn" overnight also,it takes about a week of the same style driving for it to "relearn".So switching driving styles everyday will confuse the ******.

im getting that kit very soon as i stated a few weeks ago. and i guess i drive like an old lady with no balls. sorry but gas is to high to drive like my balls would normally want to drive.

 

[Ry' N Jen]

that is just a regular problem for those ******'s. they always want to shift to a higher gear when going up a hill. Mines done it since the day i got it and so does everyone elses

Sorry buddy but my transmission doesn't do what "everyone else's" or your's does.
Mine performs the way it is supposed to perform.

 

[BoyNamedSue]

When I am speeding up to merge onto a highway mine will upshift to 4th gear at the same time I am still pressing the pedal down to accelerate. That makes no sense at all. At least wait until I let up on the pedal a bit.

I am now a frequent user of the OD button.

 

[LibertyOrDeath]

This may sound odd?

I've noticed that sometimes a transmission will act funny if it needs a fluid change. Not sure if it's a dirty filter or the fluid but a change or flush seems to correct odd shifting.

 

[JeepJeepster]

If you give it a decent amount of gas it wont upshift early. If I hang around 3k it shifts just fine but if Im taking it easy and only hit 2-2.5k it upshifts to early.

Im a fairly conservative person when it comes to things like taking care of my Jeep so I dont like to hit high rpm's that often. Unless Im passing or going up a big hill I wont get over 3k.

 

[tdamocles]

If you give it a decent amount of gas it wont upshift early. If I hang around 3k it shifts just fine but if Im taking it easy and only hit 2-2.5k it upshifts to early.

Im a fairly conservative person when it comes to things like taking care of my Jeep so I dont like to hit high rpm's that often. Unless Im passing or going up a big hill I wont get over 3k.

Ditto here

 

[Dave]

If you give it a decent amount of gas it wont upshift early. If I hang around 3k it shifts just fine but if Im taking it easy and only hit 2-2.5k it upshifts to early.

Im a fairly conservative person when it comes to things like taking care of my Jeep so I dont like to hit high rpm's that often. Unless Im passing or going up a big hill I wont get over 3k.

x2 on giving it gas and then it won't downshift.

Also, as was previously noted, just lock out o/d if you're going up hill or merging in the acceleration lane of the interstate or something. That way you are "programming" the ****** yourself as the need arises. Besides, the ****** can't see the hill or the traffic, or the curvey road.....but you can and you should be controlling it and not it controlling you. (that is why a standard ****** is better - it forces you to shift it - where an A/T is lacking in some instances). Most of the time, you can leave it alone, but sometimes you really need to shift an A/T yourself for proper engine performance (and engine brakeing) going up steeper grades or curvey up and down mountain roads and also for towing . That's what the o/d lockout button is for.

And Blake, don't be afraid to hit over 3,000 rpm while accelerating. You won't hurt anything at that rpm. Without looking it up I believe your max hp is developed at 4,200 rpm or something like that. So if you hit that in 3rd gear accelerating occasionally before you let up on the gas and go to o/d you are not hurting it. Anything over 4,200rpm is not really productive and redline on the tach starts at 5,000 rpm anyway. All you are doing is burning extra gas and stressing the motor. Now if it was a Viper or Vette or something..................but it's a Jeep

Dave

 

[flair1111]

But i think the op has a real concern here on the programming thing. ive drove many vehicles in my life (im 33) and the lib is the first and only one ive drove so far that suck *** on shifting. even my old crap hyundai excel shifted better than my lib. jeep needs to atleast have a real reprogram avalible to those who need it. but even at that...no one has yet to comment on my balls!

 

[tjkj2002]

You all do realize that the 42RLE started it's life out as a minivan ****** right(as the A604),it's going to shift like a minivan ****** since it was built to be in one.Glad I got the truck ******(45RFE),and it shifts like a truck ******.

 

[Dave]

But i think the op has a real concern here on the programming thing. ive drove many vehicles in my life (im 33) and the lib is the first and only one ive drove so far that suck *** on shifting. even my old crap hyundai excel shifted better than my lib. jeep needs to atleast have a real reprogram avalible to those who need it. but even at that...no one has yet to comment on my balls!

tjkj answered the original question on the reprogramming in his prior post.

There is the Transgo shift kit for the 42RLE or you can take it to the dealer for reprogramming, or you can change your driving style if you do it consistantly it will reprogram itself after a couple of weeks. That is how i understood it anyway.

The ****** probably was set up the way it is to get the best possible gas mileage - for a brick.

I will not comment on balls or driving style.

Dave

 

[KeswickDave]

I cut, pasted and saved this a while ago from a post somewhere, unfortunately I don't have the original author's information to give proper credit, but this may be what the original poster is looking for - I don't know how much it applies to the ****** but might be worth a try. I was going to do it but lately my fiance has been driving the jeep more than me and I don't want it learning her habits!

Forced Flash

This very simple procedure will Erase the “Adaptive Memory” stored inside the PCM and allow a new “Adaptive Memory” to be developed.

After performing this procedure the PCM will re-learn and store into Adaptive Memory your engines performance characteristics.

Disconnect the POSITIVE battery Terminal and touch it to ground for 30 seconds. (This is to discharge the PCM capacitors, which maintain the Adaptive Memory.
Reconnect the Battery Cable
Turn Ignition Switch to the “On” position but DO NOT start the engine
Turn Headlight “On”
Turn Headlights “Off”
Turn Ignition Key “Off”

Adaptive memory has now been flashed, or erased from the PCM.

When you start the engine it will be running off a set of pre-programmed tables that come with the PCM from the factory.

When you get the engine up to operating temperature the PCM will start to collect data for the “Adaptive Memory”.

The PCM will collect data for Adaptive Memory for the first 50 Warm-up Cycles.


Warm-up Cycle

A warm-up cycle happens when all of the following conditions exist.

Engine is running
A raise of 40F in engine temperature must occur ABOVE the engine temperature at start-up
Engine Coolant Temp must reach at least 160 F.


Once your engine has gone through 50 warm-up cycles in at least a 500-mile distance the PCM adaptive memory is set.
It WILL NOT Change unless you flash it out and start all over again.

 

[JIMMY JEEP]

I will be disconnecting my battery on wednesday so i can remove my alternator and change the noisey pulley wheel that is connected to the alternator(that in itself looks to be fun)and put a new serpintine belt on whilst im at it,my question is do i drive normally ,very slowly or give it plenty of beans in order to let the transmission re-learn itself?.