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Unread 06-30-2013, 02:08 AM   #1
BenJammin
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1994 ZJ 
 
Join Date: Feb 2012
Location: higganum, connecticut
Posts: 172
you guessed it ... yet another 42RE question

first let me say... i have searched until my eyes bled and still no definitive answers...

anyway...

94 zj, 42re, 231 case... all the gears engage and drive fine... but heres my issue

when in the drive position the trans works perfectly normal and everything shifts fine... but when im offroad i usually keep it locked down in 1st or 2nd... so tonight after i got off the trail i putted out to the road in 2nd gear due to the rough dirt road, i threw it into the normal drive gate and proceeded to head to get some grub, that when i noticed, 1st to 2nd was fine, then i hung second until redline and never shifted... let off, still no shift... snapped the throttle, again nothing... well damn... pulled over, shut it down, checked my TV adjustment and it is perfect, fire it up drop it in drive... back to normal... 1,2,3,OD lockup, downshift fine, came to a light, pulled off again, still fine... so i get to a large lot and manually shift it into first and second... stopped, knocked it into d and tried from a dead stop... 1 to 2 was fine then it hung in 2nd again... the only way to get it to shift again is to shut it down and restart it... theres no slipping or anything... fluids full, i have an aftermarket cooler, all my cables are adjusted properly... and it was working fine (both in D and manually shifting it at 8am this morning) so im totally lost

anyone have any ideas? im wondering is my TPS went bad... and the restart is resetting the PCM/TCM... no trans codes or Check engine code... i have a DRBII and i have monitored the entire thing, and nothing is coming up

thanks
Jammin

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Unread 06-30-2013, 05:56 AM   #2
98ZJOKC
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Join Date: Jun 2013
Location: Oklahoma City, OK
Posts: 48
Could you have hit something that might have damaged the output sensor or its wiring on the bottom of the transmission? I only know of 2 major electrical parts that help the TCU determine when to shift. The TPS and the output sensor.
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Unread 06-30-2013, 06:39 AM   #3
exmilitary
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1998 ZJ 
 
Join Date: Jun 2013
Location: Toronto, Ontario
Posts: 58
Could be the output sensor or the connected wires leading to it.
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Unread 06-30-2013, 08:11 PM   #4
BenJammin
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1994 ZJ 
 
Join Date: Feb 2012
Location: higganum, connecticut
Posts: 172
its possible, but i checked it all out today and eveything seemed ok... i guess ill grab a spare one and try it... and i replace the TPS and pigtaile today... still no change... and its really gettin to me... this trans is 8 months old, and the 4th one in the jeep since i bought it in 2011
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Unread 06-30-2013, 09:39 PM   #5
um7267
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1998 ZJ 
 
Join Date: Jan 2013
Location: Grove City, PA
Posts: 396
sounds like it loves to eat transmissions. if you have the records and they only replaced the trans and just left the original tcp/ecu id start there with junk yard stuff or swap a friends in just to see if it still does it.
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to the good times and the bad, the family we have and lost, little brother 1988-2011
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Unread 07-01-2013, 12:25 AM   #6
erob914
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1995 ZJ 
 
Join Date: Jun 2013
Location: loganville, Georgia
Posts: 2
You may have a sticking valve or broken spring in the valve body.
When in manual 1 or 2 your line pressure is higher and may cause a valve to stick or not return due to a broken spring or maybe even a burr on a spool valve. Its been a long time since I have been in one of those transmissions so I cant tell you exactly where to look in the valve body. Since it shifts fine when not putting it in manual range and then has the problem when putting it in manual range I would suspect something affected by the higher pressure. Off hand that is the only thing I can think of that is different in manual range. I didnt see any codes listed so I am assuming there is no check engine lamp furthering my suspicion that the problem is mechanical in nature.
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Unread 07-01-2013, 02:46 PM   #7
BenJammin
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1994 ZJ 
 
Join Date: Feb 2012
Location: higganum, connecticut
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its a 94 and i dont have any check engine light... and i used my DRBII to scan both engine and tranny codes... and nothing comes up... i might just drive it until it stops moving and 5 speed swap it
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Unread 07-02-2013, 01:35 AM   #8
erob914
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1995 ZJ 
 
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Location: loganville, Georgia
Posts: 2
Can a DRBII read the datastream? If it can you can watch the solonoids work when they shift. It may help pinpoint what the problem is. There is a chart to be had that shows which solonoid is on or off depending on the gear you are in.

I have used a DRBIII but never a DRBII so I dont know what it is capable of.
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Unread 07-03-2013, 10:34 PM   #9
KBUCK
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1997 XJ Cherokee 
 
Join Date: Nov 2012
Location: Hartsville, Tn
Posts: 21
I had mud stuck around the kickdown link on the trans that caused mine to stick. Car wash under the Jeep cured all.
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Unread 07-04-2013, 02:24 PM   #10
BenJammin
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1994 ZJ 
 
Join Date: Feb 2012
Location: higganum, connecticut
Posts: 172
no mud, but i hooked up my snap-on scanner and finally pulled some codes...

26 Governor pressure sensor offset drift, no idea what this really means

11 - No Crank Reference Signal At PCM (Crankshaft Position Sensor)

but the jeep runs without an issue...
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