545RFE, harsh 2 to 3 upshift fix?

racertracer · **Posted:** Mon May 05, 2014 6:25 am

Yeti, ricordati che..... piano piano si va lontano.

Yeti · **Posted:** Mon May 05, 2014 4:57 pm

grazie racetracer , I'm refining the details and i think next week I'm ready , I want to test at early morning when here is cold and if work ok we can start

Yeti · **Posted:** Fri May 23, 2014 4:34 am

guys, I'm late, but I have problems to my kj sorry

ebbnflow · **Posted:** Sat May 24, 2014 4:39 pm

No worries Yeti. I hope you solve that noise issue soon.

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lars0247 · **Joined:** Sat Oct 12, 2013 12:09 am **Posts:** 98

I believe I have found the solution. During the 2 to 3 upshift, the 2C clutch disengages, as the OD clutch is engages (see page 21-172 of the 2005 FSM Automatic Transmission 545RFE section). When my Jeep Liberty CRD shifts good, this happens simultaneously, and the shift is transparent. When it binds up, the 2C clutch takes longer than it should to release. This can be seen by graphing when the 2C and OD pressure switches release and are made with Autoenginuity's Enhanced Chrysler program.

Now here is the kicker. The FSM talks about how to drive learn the transmission for a smooth 2 to 3 upshift, but the problem is that this procedure only updates the OD CVI. The 2C CVI is only updated during a 3 to 2 kick downshift. (see excerpt of FSM below). They both have to be right for the shift to be smooth as can easily been seen in the graphs I mentioned.

With my driving style and loads of torque with the CRD, the 3 to 2 downshift is almost never necessary and therefore rarely happens. For me, I have been regularly doing 3 to 2 downshifts as described below , and have not experienced the rough shifting (binding) at all over the last week.

I would recommend all who have this issue take their Jeep, and warm it up, and do a series of kick down shifts from 3 to 2 (once it shifts into 3rd, just push the accelerator down until it shifts back to 2nd and hold it for maybe a second or two to be sure the shift is complete). This should fix your problem as the transmission will learn the proper value for the 2C CVI, which should cause it to release in sync with the application of the OD clutch thereby eliminating the bind. I now simply make sure I do the 3 to 2 kick down shift from time to time so that the 2C CVI remains correct.

3.3.7 CLUTCH VOLUMES – 45/545RFE
...
The 2C clutch volume is updated when doing a
3-2 shift with throttle angle between 10° and 54°.
The transmission temperature must be above 43°C
(110°F). The clutch volume should be between 25
and 85.
...
The OD clutch volume is updated when doing a
2-3 shift with throttle angle between 10° and 54°.
The transmission temperature must be above 43°C
(110°F). The clutch volume should be between 30
and 100.
...

Yeti · **Posted:** Fri May 30, 2014 11:29 am

nice solution , I'll try It

ebbnflow · **Posted:** Fri May 30, 2014 12:44 pm

Lars,

Thanks for posting that. I'll give it a try. Although my jeep has been shifting great all this month.

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lars0247 · **Joined:** Sat Oct 12, 2013 12:09 am **Posts:** 98

My harsh shift is back. The 3 to 2 update to the 2C CVI did not help. I'll keep searching for the answer.

Ebb,
Anything particular you did recently that might have contributed to your month of trouble free shifting?

ebbnflow · **Posted:** Sun Jun 01, 2014 12:48 pm

lars0247 wrote:

Ebb,
Anything particular you did recently that might have contributed to your month of trouble free shifting?

Well that is a bummer. Your logic seemed like a good solution.

I have been driving the jeep a little more often ( jeep is wife's daily driver) and I have a heavier right foot than her. The temp here has been a lot warmer since we're getting into summer. Other than that, I have not changed or serviced anything. I'll post up when the problem comes back as I am confident it will

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ebbnflow · **Posted:** Sun Jun 01, 2014 11:46 pm

A little update. I asked the wife if she has done anything different and she said yes. The jeep has the drain back issue. Mostly when the uengine is still somewhat warm after it sits for 1-3 hours. Overnight doesn't seem to cause problems. Done everything including transgo kit in front pump, but the problem is still present.

Anyways, the wife has been shifting into neutral after every start up and has revved the engine for 3-5 seconds before shifting into gear and driving away. She just started doing this regularly in the last 30 days. Coincidence. I am not sure. Time will tell.

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Yeti · **Posted:** Thu Jul 03, 2014 5:28 pm

I think my Transmission knock ..........hope to fix it soon

lars0247 · **Joined:** Sat Oct 12, 2013 12:09 am **Posts:** 98

I have now had a month of trouble free shifting since cleaning the pins / TCM connector as described in viewtopic.php?f=5&t=79424

I recommend anyone who has the problem try this.

ebbnflow · **Posted:** Sun Aug 03, 2014 2:59 pm

Thanks for an update. I will give this a try. Although our jeep has been shifting pretty good lately. A slight harsh shift , here and there, but not as bad as it has been in the past.

ebbnflow · **Posted:** Sun Aug 03, 2014 10:20 pm

I used deoxit today on my TCM. I will report back in a few weeks if it works. I also noticed that the lid on the TCM did not sit flat and had a slight gap between the lid and the shell. I put a bead of rtv on it to seal it up.

thermorex · **Posted:** Tue Aug 05, 2014 9:54 am

I may try this also, it's a good preventive maintenance.

Yeti · **Posted:** Tue Aug 05, 2014 11:20 am

today at the Fiat center , I have done a relearn , during the process the AT Kick at every shift and the mechanic said that my transmission is gone , what do you think ?

Yeti · **Posted:** Tue Aug 12, 2014 1:33 pm

for who have a scan tool try to see if the temperature sensor in the valve body solenoid read a correct value , if the tranny show a not normal temp , this is the problem , the TCC engage going down hill and when the pedal is released in 2° too , if the TCC do not disengage the hard shift occur

ebbnflow · **Posted:** Sat Aug 16, 2014 2:29 pm

I'm sad to say cleaning the TCM connector did not work for me.

Shifting from 2-3 is worse than before.

Yeti · **Posted:** Sat Aug 16, 2014 5:13 pm

try to make the test described here

viewtopic.php?f=5&t=79424

lars0247 · **Joined:** Sat Oct 12, 2013 12:09 am **Posts:** 98

The rough 2 3 shift is back. I had two months of driving bliss, but as soon as the weather started to get cooler in the mornings, the rough shift returned. I even tried another thorough cleaning of the pins and connector, but that did not help.

545RFE, harsh 2 to 3 upshift fix?

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