545 RFE Musings - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WJ > Troubleshooting/Problems

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 10-24-2015, 10:47 PM
Member
 
Join Date: Oct 2015
Posts: 19
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 472
mhuppertz is on a distinguished road
545 RFE Musings

When driving in a cruise condition my wife's 2002 GC would feel like it was locking and unlocking the converter in a regular heartbeat pattern. Other issues followed like coming out of gear, downshifting to China, and hesitations or delays shifting between reverse and drive, etc. I changed both filters, new fluid of course, no difference. Changed the TCM, TPS, same deal. The issue seems to go away until the evap system sets a check engine light then it comes back. Pulled the valve body and replaced the solenoid pack with the new design, same.

The issue kept feeling like electronic noise, but there were no codes being set other than the pesky evap code.

Finally the battery went out followed by the alternator. When I stuck on the new alternator the issue stopped for a good while, but came back, but much more infrequently.

Now it appears my PCM might have died (in another post).

I know that there is a lot of data sharing between the two computers, so now I am wondering if there hasn't been some bus issue.

Anyone had these transmission issues?

Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 10-25-2015, 06:57 AM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 7,321
Thanks: 17
Thanked 377 Times in 364 Posts
Rep Power: 529478
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: 545 RFE Musings

Many time shifting issues are caused by one of the two speed sensors.
But indeed, several parameters are shared between the PCM and TCM, so i would first focus on the engine starting problem and have it running properly and than see if the shifting problem is still there.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #3  
Old 11-04-2015, 09:03 PM
Member
 
Join Date: Oct 2015
Posts: 19
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 472
mhuppertz is on a distinguished road
Re: 545 RFE Musings

Ok, I will replace the speed sensors, and if that doesn't fix it pull the pan for the millionth time and change that pressure solenoid.
Already have another round of ATF+4 ready to go if need be.


(If it were my daily, I would ignore the heartbeat, unlock and lock..............unlock and lock converter issue, but to my wife this is a major problem!!!
Reply With Quote
  #4  
Old 11-05-2015, 04:46 AM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 7,321
Thanks: 17
Thanked 377 Times in 364 Posts
Rep Power: 529478
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: 545 RFE Musings

You already changed the TRS/solenoid block, that has all the solenoids in it. There are no other solenoids inside the transmission. Did you get the TCM scanned, to see if it gave any faults. In fact the solenoid which activates the torque converter clutch (TCC), is also used for first gear, so it should not be a problem with this solenoid.
The input speed sensor is used as a signal by the TCM for the TCC operation.So besides this, there is only a pressure sensor on the right hand aft side of the transmission housing, but i would think that you would have other problems as well when that thing is faulty. You can simply disconnect the connector to it and there will be a fixed line pressure regulated at all time, just to see if it will change anything to the TCC operation.
What i´m thinking now, do you see the rpm going up and down when the locking/unlocking happens? Because if it doesn´t, than the TCC is not unlocking at all, but its a kind of a surging of the engine. In that case, i would think about the crank position sensor.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #5  
Old 11-05-2015, 05:32 AM
tomk's Avatar
Premium Member
My Jeep: 2014 5.7L WK2
 
Join Date: Jan 2012
Location: Amherst, MA
Posts: 747
Thanks: 15
Thanked 87 Times in 73 Posts
Rep Power: 1566024
tomk has a reputation beyond reputetomk has a reputation beyond reputetomk has a reputation beyond reputetomk has a reputation beyond reputetomk has a reputation beyond reputetomk has a reputation beyond reputetomk has a reputation beyond reputetomk has a reputation beyond reputetomk has a reputation beyond reputetomk has a reputation beyond reputetomk has a reputation beyond repute
Re: 545 RFE Musings

On Durangos, TCC locking/unlocking is often caused by the throttle position sensor.. might be worth a check.

Also possible that the alternator failure was just a symptom, and there is something wrong with the battery/charging system.. these PCMs are known to be sensitive to unstable line voltage, so maybe another look at the charging system is in order..
__________________
2007 WK Limited 5.7L
2014 WK2 Overland 5.7L
And a few past Durangos
de W1PF
Reply With Quote
  #6  
Old 11-05-2015, 06:59 AM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 7,321
Thanks: 17
Thanked 377 Times in 364 Posts
Rep Power: 529478
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: 545 RFE Musings

Quote:
Originally Posted by tomk View Post
On Durangos, TCC locking/unlocking is often caused by the throttle position sensor.. might be worth a check.

Also possible that the alternator failure was just a symptom, and there is something wrong with the battery/charging system.. these PCMs are known to be sensitive to unstable line voltage, so maybe another look at the charging system is in order..
Good sugestions, but TPS, battery, alternator and PCM where changed already. So there is not much left on the charging system then wiring or bad ground(s).
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #7  
Old 11-06-2015, 11:06 AM
Member
 
Join Date: Oct 2015
Posts: 19
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 472
mhuppertz is on a distinguished road
Re: 545 RFE Musings

All my grounds are perfect, even added a 2 gauge ground from the engine to the chassis just to be 150% sure. Not burnt or stressed wires anywhere I can find.
The fact that is it a regular pulse makes it unlikely to be something totally erratic and analog.
Reply With Quote
  #8  
Old 11-26-2015, 08:02 AM
hoffmanestates's Avatar
Senior Member
 
Join Date: Nov 2011
Posts: 1,244
Thanks: 57
Thanked 10 Times in 10 Posts
Rep Power: 3717
hoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond reputehoffmanestates has a reputation beyond repute
Re: 545 RFE Musings

Possibly the torque convertor internally?
I had a trans issue of not locking for over drive either highway or city driving.
Replaced tq convertor and trans as it was cheapest ($300 used)
And now i am happy and everything works at least on the trans side of things.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Jeep 5-45 RFE tranny problems Frango100 Troubleshooting/Problems 7 07-11-2011 12:09 AM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 07:16 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.