Need help with auto trans issue - JeepForum.com
 
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post #1 of 14 Old 07-07-2021, 10:19 PM Thread Starter
BackwoodsJeeper
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Need help with auto trans issue

Hi all, just had a brand new transmission put in my wrangler (4 speed auto 42rle), my previous transmission would not shift out of overdrive (until about 20-25 mph, as if its forced to downshift at that point) and would recommended that a new transmission was required

Well with the new trans(Jasper) I'm having the same issue. Could it be something with the computer at all? i've ordered a new tcm, as ive been told that that may be failing, however I'm afraid that may not be my issue. Any pointers would help, I'm desperate to fix this issue as i can only throw parts at it for so long. The only solution i have for now is turning off overdrive, but that shouldn't be a permanent solution.

Info about jeep:
2003 jeep wrangler
42rle, 4.0
132,450k
35x12.5r15
5.13s


Last edited by BackwoodsJeeper; 07-07-2021 at 10:23 PM. Reason: details
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post #2 of 14 Old 07-08-2021, 04:06 AM
jerseyjeeper09
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Not real familiar with your set up as I have a 98 with a 3 speed auto, but on mine I know the trans will act wacky if the kickdown cable isn't set right. Again, I'm not sure if your model has this cable but if mine's not set right it can make the Jeep not want to upshift OR downshift like its supposed to, and it can feel like there's something wrong with the trans...There are several write-ups on the web about how to set the cable and probably several on this site...
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post #3 of 14 Old 07-08-2021, 06:52 AM
jtec
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With OD off, shifts 1,2,3 up and and down. With OD on 1,2,3 and stays in OD (TCC?)

quick thoughts -
Could it be stuck TCC? I am thinking maybe a wiring issue.
Did you use a SCANNER to check codes?
No other issues- speedo, Cruise (if applicable) ?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #4 of 14 Old 07-08-2021, 08:55 PM Thread Starter
BackwoodsJeeper
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Quote:
Originally Posted by jtec View Post
With OD off, shifts 1,2,3 up and and down. With OD on 1,2,3 and stays in OD (TCC?)

quick thoughts -
Could it be stuck TCC? I am thinking maybe a wiring issue.
Did you use a SCANNER to check codes?
No other issues- speedo, Cruise (if applicable) ?
Thats an interesting thought that i have not seen before, and further looking into the TCC, it would make sense that it shifts fine without od, but has issues with od on. There are no codes present on the dash, so i assume an OBD scanner would tell no different, although i could be wrong. Speedometer is accurate, and cruise control works as it should.

Where should I start looking to diagnose the TCC thing? (plugs, wiring, etc)
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post #5 of 14 Old 07-08-2021, 10:21 PM
jtec
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get a scanner on the system would be step 1,

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #6 of 14 Old 07-09-2021, 11:56 AM
Rubi4MyMrs
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^^x2


As I recall the various trans codes (P07xx) are not displayed in the odometer display when using the key trick other than maybe the P0700 code which is just a basic code indicating a malfunction in the trans. Then a reader or scanner that reads trans codes is needed.

Also according to the FSM the TCC is used to lock the converter in 3rd gear as well as in O/D so it seems strange that turning the O/D off releases the lockup. But since it did the same with both old & new transmissions you would have to think TCM or wiring.


The torque converter clutch is hydraulically
applied and is released when fluid is vented from the
hydraulic circuit by the torque converter control
(TCC) solenoid on the valve body. The torque converter
clutch is controlled by the Powertrain Control
Module (PCM). The torque converter clutch engages
in fourth gear, and in third gear under various conditions,
such as when the O/D switch is OFF, when
the vehicle is cruising on a level surface after the
vehicle has warmed up. The torque converter clutch
will disengage momentarily when an increase in
engine load is sensed by the PCM, such as when the
vehicle begins to go uphill or the throttle pressure is
increased.

This is how/when the pressure switches are checked. I would think a failure here would set a specific code so getting that checked is definitely your next step.

A Diagnostic Trouble Code (DTC) will set if the
PCM senses any switch open or closed at the wrong
time in a given gear.
The PCM also tests the 2/4 and OD pressure
switches when they are normally off (OD and 2/4 are
tested in 1st gear, OD in 2nd gear, and 2/4 in 3rd
gear). The test simply verifies that they are operational,
by looking for a closed state when the corresponding
element is applied. Immediately after a
shift into 1st, 2nd, or 3rd gear with the engine speed
above 1000 rpm, the PCM momentarily turns on element
pressure to the 2/4 and/or OD clutch circuits to
identify that the appropriate switch has closed. If it
doesn’t close, it is tested again. If the switch fails to
close the second time, the appropriate Diagnostic
Trouble Code (DTC) will set.
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post #7 of 14 Old 07-09-2021, 12:15 PM
ravenworks
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I'm going to ask you a question that may sound dumb, did you replace the torque converter and flush the cooling system before you installed the transmission?

Semper-Fi "81-84"
I.U.O.E. - 18
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post #8 of 14 Old 07-09-2021, 12:27 PM
jtec
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is there a OD switch in 2003 IDK

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #9 of 14 Old 07-09-2021, 12:31 PM
jtec
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oops there is a OD switch..... wrong MY diagram, now who can I blame for that.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #10 of 14 Old 07-09-2021, 01:03 PM
jtec
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with the new PCM, did you check if it needs programing - pinion factor?
ANd maybe a quick learn....

Again I suggest a SCAN - step 1.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #11 of 14 Old 07-09-2021, 04:08 PM Thread Starter
BackwoodsJeeper
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Quote:
Originally Posted by jtec View Post
get a scanner on the system would be step 1,
Hooked up to a scanner, no codes being thrown, nor any on the dash
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post #12 of 14 Old 07-09-2021, 04:10 PM Thread Starter
BackwoodsJeeper
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Quote:
Originally Posted by jtec View Post
with the new PCM, did you check if it needs programing - pinion factor?
ANd maybe a quick learn....

Again I suggest a SCAN - step 1.
Also new TCU has not come in yet, however i did attempt the reset process of touching the battery negative and then flicking the headlights, and now change
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post #13 of 14 Old 07-09-2021, 04:11 PM Thread Starter
BackwoodsJeeper
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Quote:
Originally Posted by ravenworks View Post
I'm going to ask you a question that may sound dumb, did you replace the torque converter and flush the cooling system before you installed the transmission?
New torque converter was installed with new trans and obvious new fluid was put in. Coolant has not been flushed.
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post #14 of 14 Old 07-12-2021, 12:10 PM Thread Starter
BackwoodsJeeper
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Update: New TCM came in and my problems went away, thank you for all the responses and suggestions!
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