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| Author |
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deblouthomas
Offline
3 posts
1990 Red 300ZX 2+2 auto black leather
lafayette la
6-14-2006
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| « Re: 94 240 conv with AT shift problems (oldbald_sarge) | 10:00 PM 6/14/2006 |
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I had a black 93 that did that exact same thing at only about 70K. I solved the problem by trading it in on a red 95 the same day. Although I loved the new body style, I have always regretted giving up my black beauty ragtop Debbie
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kc240guy
Offline
328 posts
90 champagne coupe
Kansas City mo
6-29-2006
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| « Re: 94 240 conv with AT shift problems (deblouthomas) | 6:38 PM 6/29/2006 |
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hey i know how to fix it and it costs nothing. you see theres a sensor that measures the resistance in the line and makes it shift according to that. cuz its an electronic tranny. theres a second way the car can shift. it just goes by the engine rpm and throttle position which is the better way to do it but it doesnt by default. all you gotta do is pull a sensor plug. its behind the battery a little bit and its the top one. pull it and the car will never do it again. the previous owner did the research and fixed it and told me about it . so far ive helped a couple other people with the info.
you will also notice the od on light blinking right after you start it.
Modified by kc240guy at 6:54 PM 6/29/2006
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sudcricket
Offline
4 posts
hyundai elantra
phoenix az
8-7-2006
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| « Re: 94 240 conv with AT shift problems (kc240guy) | 10:15 PM 8/7/2006 |
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Hi,
I have a hyundai Elantra 1997 model. and I have a gear shift problem. The problem doesnt happen when the car is cold, but as it runs and temp increases the car wont shift from 15-20-25 mph. as if its stuck and then moves hard. I read the topic on nissan 240 similar problems with many owners and the solution found was "removing the plug from revolution sensor, and the backup speedometer will tell the module when to shift". Is there any such solution for Hyundai Elanta aswell. Please do let me know, you can also e-mail me at simsudra1@yahoo.com.Thanks,
Sudhakar
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tcrow31
Offline
23 posts
94 J30
houston TX
9-10-2006
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To everyone that posted here, did replacing the Revolution Turbine Sensor fix the shifting problem? I am currently having the same problem. i have no 2nd and 4th gear here is a link to my post. http://forums.nicoclub.com/zerothread/197088
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NISTECH
Offline
12294 posts
nowhere none
5-25-2003
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I read through your post and know it doesnt sound like your rev sensor I think you have something internal going on inside the trans. perhaps wrong fluid or contaminated fluid.
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tcrow31
Offline
23 posts
94 J30
houston TX
9-10-2006
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| « Re: (NISTECH) | 7:07 PM 9/14/2006 |
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It could very well be. I tried unpuging the turbine sensor and it didnt make a change. the only weird thing is that this happened all the sudden with no warning. that morning it shifted fine and i parked for like 2hrs then drove home and at first it was fine then i noticed no 2nd gear and 4th. now im wondering if a silonoid is cloged. i know this section is for the 240s but would you happen to know where to get to the silonoids and where i can download a FSM possibly for free for my car. Did a search and found one for everyone else except mine.
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jamesblonde82
Offline
783 posts
1992 Nissan 240sx convertible RIP 5/10/07 1993 Nissan 240sx convertible
jacksonville FL
3-20-2006
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| « Re: 94 240 conv with AT shift problems (240ROCKER) | 12:24 PM 9/15/2006 |
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| Quote, originally posted by 240ROCKER » | | Well guys I found out something interesting about having your automatic transmission rebuilt. Apparently, when you opt to have your automatic transmission rebuilt, this does not include rebuilding the "valve body" which is the brain of the transmission. Several people have posted on here and on other places on the internet who decided to rebuild their transmissions only to find out that they still had the shift problem. What a bummer to know that you spent all that money for a rebuild and it didn't actually fix the problem. The valve body has all sorts of control valves and springs and is a very expensive part to replace, which is why most tranny shops don't rebuild or replace these. I have learned that more than likely I have a stuck control valve in the valve body and the reason that I normally don't have a problem in colder weather (50° or lower) is because there is more pressure being built up in the valve body to compensate for the colder temps. and when it's warmer weather, the pressure isn't as high and therefore one of the control valves that pertains to the 1st to 2nd shift is getting stuck. I was told that an additive called "Transmedic" might unstick this valve. It will take about two to three weeks to really get into the system, but that it might keep that control valve from sticking. What are your thoughts on this? 240ROCKER
Modified by 240ROCKER at 1:03 PM 3/1/2005
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i can vouche for that. i rebuilt my A/T about 6 months ago. it was slippin, shifting slow. then finally the torque converter went out. so i did the whole nine yards. i seen the valve body, made sure it was operating by blowing pressure in it. it shows u how to check in the rebuilt kit manual. basically all i changed was the clutches and rings and what not and of course the torque convertor. so now it drives a LOT better, but it still shifts slow. like the valves are working but not fast enough. this must be a issue with these cars for sure. while doing this, i also found out you can use pathfinder transmissions. so if any of you guys ever just want to swap to a used one, you can use the pathfinder as well. but if you rebuild a pathfinder tranny, make sure you get the parts for the pathfinder, not the 240. the 240 clutches arent as thick. if u put them in a pathfinder tranny, you will have serious shifting probs. and dont ask me how to tell the difference if youre not sure. i found out when mine was completely apart that it has the pathfinder tranny in it by measuring certain internal parts and comparing them to a chart. then i wrote on the tranny for any future reasons, that its a pathfinder tranny. good to know these things. 
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jamesblonde82
Offline
783 posts
1992 Nissan 240sx convertible RIP 5/10/07 1993 Nissan 240sx convertible
jacksonville FL
3-20-2006
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| « Re: 94 240 conv with AT shift problems (kc240guy) | 12:46 PM 9/15/2006 |
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| Quote, originally posted by kc240guy » | hey i know how to fix it and it costs nothing. you see theres a sensor that measures the resistance in the line and makes it shift according to that. cuz its an electronic tranny. theres a second way the car can shift. it just goes by the engine rpm and throttle position which is the better way to do it but it doesnt by default. all you gotta do is pull a sensor plug. its behind the battery a little bit and its the top one. pull it and the car will never do it again. the previous owner did the research and fixed it and told me about it . so far ive helped a couple other people with the info.
you will also notice the od on light blinking right after you start it.
Modified by kc240guy at 6:54 PM 6/29/2006
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can you be a lot more specific. was it the fuse box? what relay or whatever was is that you pulled?
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kc240guy
Offline
328 posts
90 champagne coupe
Kansas City mo
6-29-2006
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| « Re: 94 240 conv with AT shift problems (jamesblonde82) | 10:45 PM 9/16/2006 |
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the fuse box behind the battery. there is a set of plugs behind that box. pull the top one.
 Attachment: shift.JPG (35263 bytes, downloaded 1678 times)
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Glyph
Offline
180 posts
1993 Nissan 240SX Converible
San diego Ca
4-18-2006
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| « Re: 94 240 conv with AT shift problems (kc240guy) | 3:03 AM 9/17/2006 |
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This write up is incredible. The amount of cumulative time and money that has been saved by the efforts and diligence of a couple of dedicated Niconauts is staggering. When I first bought mine I too had the exact same problem. Instead of dumping big bucks into it only to receive nothing back but frustration, I found this post, followed it to a tee, and haven't experienced even a hint of the problem in over three months now.
THANK YOU guys. You know who you are.
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acidbbg
Offline
108 posts
2006 MazdaSpeed6 GT
Somewhere NJ
10-4-2006
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good work guys! Charlie
By My Parts!Upgraded Bushing Set Clutch & Flywheel Combo For SR20 http://forums.nicoclub.com/zerothread?id=263296
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Florida240sx
Moderator
Offline
11625 posts
93 Hatch 5spd 93 vert 89 hatch
DeLand FL
7-1-2004
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Been going good now for 3 weeks  Too ba dmy engine is toast, and now swapping in a vg30dett
http://www.itsfunnyhoney.com/v..._timeKA-T why settle for anything less?
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MNVERT
Offline
70 posts
s13
Westminster ca
3-8-2007
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| « Re: (Florida240sx) | 12:15 AM 4/10/2007 |
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my tranny wont shift into any gears when in drive,reverse,etc. anyone had this problem b4?
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tumolt
Offline
45 posts
1993 240 SX SE
Ft. Lauderdale Florida
7-24-2005
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| « Re: 94 240 conv with AT shift problems (oldbald_sarge) | 5:54 PM 4/16/2007 |
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I went through the same thing. You're wasting time and money trying to figure what is wrong with your transmission. I went through two repairs only to find out the reason for the intermittent shift was a burned out resistor in my computer. It is located on the passenger side wheel wall behind the plastic cover. It is a mother to get to and you'll see two boxes, one on the bottom and one way up top. The one up top is the computer. You'll have to pull the fan motor (a big feat) but can be done. I left one clip off since it was a mother to put back on. You have to take the cover off of the computer and check to see if there are any burned components. Some companies do sell rebuilt units. Mine came from ACE in Hollywood, Florida at a cost of $150. I wish I knew before going through two rebuilds. It might be a good time to think about that too! Other than that, don't overheat your motor or you'll be going through what I am with a valve job and a mechanic who can't get it to run. These cars are nice but the mechanical problems that come up are no picknic. Good luck. Matt
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MNVERT
Offline
70 posts
s13
Westminster ca
3-8-2007
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| « Re: 94 240 conv with AT shift problems (tumolt) | 1:33 PM 4/17/2007 |
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| Quote, originally posted by tumolt » | | I went through the same thing. You're wasting time and money trying to figure what is wrong with your transmission. I went through two repairs only to find out the reason for the intermittent shift was a burned out resistor in my computer. It is located on the passenger side wheel wall behind the plastic cover. It is a mother to get to and you'll see two boxes, one on the bottom and one way up top. The one up top is the computer. You'll have to pull the fan motor (a big feat) but can be done. I left one clip off since it was a mother to put back on. You have to take the cover off of the computer and check to see if there are any burned components. Some companies do sell rebuilt units. Mine came from ACE in Hollywood, Florida at a cost of $150. I wish I knew before going through two rebuilds. It might be a good time to think about that too! Other than that, don't overheat your motor or you'll be going through what I am with a valve job and a mechanic who can't get it to run. These cars are nice but the mechanical problems that come up are no picknic. Good luck. Matt |
thanks for the info i think thats what it is , i just ordered parts for the manual 5speed swap but im gonna try that first to see if it is what u said cause i think it is a electrical problem ill keep u guys posted...
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Pathfinder_1997
Offline
1 posts
Pathfinder 1997
Canovanas PR
5-3-2007
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| « Re: (NISTECH) | 2:57 PM 5/3/2007 |
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Hey I am new in this forum but this Nico Club is the best Nissan Source on the Net.
I have a 1997 Pathfinder LE and I have a problem in the tranny. I start the engine and in about 15 minutes of driving the tranny upshift the overdrive and downshift the overdrive is just do this all the time this lasts months. I want to know if it the revolution sensor have something to do whit this?
If have something to do where is it? THANKS!!
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nosferatu226
Offline
7 posts
93 240sx
Belden MS
7-16-2007
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| « Re: (NISTECH) | 10:13 PM 7/16/2007 |
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I just bought a 93 240 today and it has the same problems everyone else seems to be having but a little different. It will only shift from first to second at around 6000 rpm, and from second to third at redline. I've only had the car for a few hours now but i havent seen it do anything other than that. I tried removing the revolution sensor (the top plug behind the fuse box?) but it didnt shift at all and the car had much less power. The car also has some other electrical problems that make me think it could be a problem with the wiring harness? The tail lights and brake lights stay on when i turn the car off so I have to disconnect the battery when i turn the car off, the pop-up headlights sometimes stay up but if you press the button to make them go up and down enough times they will eventually go down, also the e-brake light inside the car stays on most of the time but will sometimes go off. I didnt know if any of that stuff might be connected in some way to the transmission screwing up. Maybe i just have a lot of sh*tty wiring? I hate automatics...guess you can't complain when you get a running car for $400 though. If anyone can help that would be nice. Great job on the rest of the thread by the way. Looks like you guys spent alot of time on this.
Modified by nosferatu226 at 10:13 AM 7/17/2007
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aradapilot
Offline
32 posts
1990 240sx se
rutherford nj
3-4-2007
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I've been having a problem like this recently...I had the car off the road for a while as my camshaft snapped (yes, snapped in two) and finding another was a pain, and now that I swapped the new one in and went for a drive she wouldnt shift until near redline. It seemed electrical...as the tranny had been fine up until then and a few connectors had to be taken apart to do the timing work, including the tps. When I'm home from work tonight I'll try undoing the rev sensor...hopefully it's that, maybe hurt from sitting not running for a while during a heat wave...you'll hear back from me soon.And a note, I read this whole thread and it's been immensely helpful - would've taken me forever to test all that by myself. Thanks all! Hopefully this will get linked in a sticky or something as it seems to be a common problem.
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aradapilot
Offline
32 posts
1990 240sx se
rutherford nj
3-4-2007
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Okay...same problem with it unclipped (the top connector with 3 prongs next to the relay box, right?). So, trying to figure out what it is. More details:
shifts 1-2 at redline. shifts 2-3 at about 5500-6000. haven't gotten to 4 yet, as i'd need to go about 80 to redline it in 3rd and I don't want to go far from home to a nice highway or anything until I work this out...
also, when it finally does shift, if i let off the gas the rpms drop down to about 1k even if the engine should be held higher by the trans...not sure whats causing this. I can get back up to a normal range easily and the torque kicks right back in.
note: having gears 1,2, and 3 means all solenoids fire. I tried disconnecting the kickdown switch too...no luck there.
Could this be a problem with the tps? what other inputs are used? It seems like the rev sensor disconnect worked for everyone but me...though my problem sounds identical.
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nosferatu226
Offline
7 posts
93 240sx
Belden MS
7-16-2007
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| « Re: (aradapilot) | 2:11 AM 7/19/2007 |
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| Quote, originally posted by aradapilot » | Okay...same problem with it unclipped (the top connector with 3 prongs next to the relay box, right?). So, trying to figure out what it is. More details:
shifts 1-2 at redline. shifts 2-3 at about 5500-6000. haven't gotten to 4 yet, as i'd need to go about 80 to redline it in 3rd. |
yeah thats exactly what happens in mine. 
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aradapilot
Offline
32 posts
1990 240sx se
rutherford nj
3-4-2007
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| « Re: (nosferatu226) | 11:07 AM 7/19/2007 |
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could be tps or vss...it's going to be hell pulling my atcu out.
any other ideas?
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nosferatu226
Offline
7 posts
93 240sx
Belden MS
7-16-2007
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| « Re: (aradapilot) | 6:07 PM 7/19/2007 |
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I've got it in a shop right now. Hopefully they can figure something out. I'll post it if they do.
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aradapilot
Offline
32 posts
1990 240sx se
rutherford nj
3-4-2007
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It's the TPS. was throwing 2.68V at closed throttle as opposed to the 0.4 expected. Just got a replacement, gonna swap it in a little later, I'm tired as hell.
Check the voltage on term 20 on the ECU (NOT atcu) to ground, see if it gives 0.4 at closed throttle and 4.0 at open and ranged in between. Sounds like you're having the same problem as me.
And driving with the bad tps disconnected was fine. Obviously it shifted based on the charts in the fsm rather than pedal pressure, but otherwise performed beautifully.
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nosferatu226
Offline
7 posts
93 240sx
Belden MS
7-16-2007
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| « Re: (aradapilot) | 9:30 PM 7/20/2007 |
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thanks for the info, let me know how it turns out
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LushPenguin
Offline
30 posts
1992 Nissan 240 Conv
Tallahassee Fl
4-13-2007
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| « Re: (NISTECH) | 8:35 PM 7/22/2007 |
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hey man, you're totally correct!!!!After noticing "rockers" photo I dropped what I was
doing, went out ,and unplugged the top plug behind the
battery & fuse box..... That was 3 days ago and
I've put almost 80 city miles on my car since then
and it has run perfect!!!!! THIS IS A HUGE DISCOVERY!!!! YOU ARE SAVING US BIG $$$$$ Give me a few weeks
and if this still works I will mail you both a check for
$75.00 each.... I wish I could do more but I'm at a
transitional stage in my life currently and can't really
afford much more.... Eitherway I think
anyone who's found this to work for their 240 AT's
should salute you at the minimum and cut you
a check or money order for for fixing the problem at
zero cost!!!! Again man thanks!!!!!
-Dennis "Nframe346@hotmail.com" 
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LushPenguin
Offline
30 posts
1992 Nissan 240 Conv
Tallahassee Fl
4-13-2007
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| « Re: 94 240 conv with AT shift problems (kc240guy) | 8:41 PM 7/22/2007 |
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I said "rockers" photo but I meant yours!!!! Dude that has
totally repaired my shift problem at zero cost!!!! Bill me if ya'd
like but I prefer to send ya $75.00 in a few weeks when I
get paid again... My car was not shifting two or three times
in a 5 mile period... I pulled the plug and WOW it runs fine...
I've put 80 "city" miles on it in 3 days and it has run flawlessly!!!!Again thx, -Dennis "Nframe346@hotmail.com" 
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nosferatu226
Offline
7 posts
93 240sx
Belden MS
7-16-2007
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| « Re: (aradapilot) | 2:17 PM 7/24/2007 |
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aradapilot, where is the tps located? you wouldn't happen to have any pictures would you?
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nosferatu226
Offline
7 posts
93 240sx
Belden MS
7-16-2007
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| « Re: (nosferatu226) | 3:38 PM 7/26/2007 |
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ok i got the tps off but i havent had a chance to try it yet because i think my battery is fried...i guess its new battery time 
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ishkabibble
Offline
4664 posts
1992 NX2000 hardtop, 1993 NX2000 t-top, 1997 Infiniti I30t
Portland OR
11-5-2006
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Well, I hated the way my car shifted (seemed to sometimes hesitate for a second before shifting, never wanted to let the car rev up, etc.), so I tried out disconnecting the rotational sensor. Shifts much better now, so I'm leaving it that way.
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nosferatu226
Offline
7 posts
93 240sx
Belden MS
7-16-2007
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| « Re: (nosferatu226) | 6:34 PM 8/1/2007 |
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ok so i got the tps unplugged and the car started but i'm still having the same problem...no shift until redline. anyone have any other ideas?
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Jesda
Nice Pants, full of bacon and win
Offline
30657 posts
LETS GO VANNING
ITS A PARTY IN THE USA
5-5-2003
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Happened to me once. I bumped it into neutral and back into drive, and all was well.
| Quote, originally posted by MinisterofDOOM » | | Get out of my gene pool. And take your ES350 with you. |
BUY INFINITI PARTS - 1-888-216-5328 | NICO Porn Thread | http://www.q45.org | http://www.vh45de.com
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omg240
Offline
109 posts
93 240sx vert, 1991 300zx TT
Cincinnasty OH
6-1-2007
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My convertible was shifting the same way everyone elses is. I didnt really know what to do and just found this topic tonight. I found a s14 tranny that shifted perfectly a couple weeks ago and I am having installed as we speak. Am I going to run into the same problem with an s14 automatic tranny?
-Samantha
1993 240SX vert (for sale), 1991 300zx TT
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ishkabibble
Offline
4664 posts
1992 NX2000 hardtop, 1993 NX2000 t-top, 1997 Infiniti I30t
Portland OR
11-5-2006
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| « Re: (omg240) | 5:41 AM 8/24/2007 |
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If your rotational sensor is bad, probably.
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omg240
Offline
109 posts
93 240sx vert, 1991 300zx TT
Cincinnasty OH
6-1-2007
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| « Re: (nosferatu226) | 7:32 PM 9/18/2007 |
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Does anyone know Nissan's part number for the revolution sensor?| Quote, originally posted by nosferatu226 » | The tail lights and brake lights stay on when i turn the
car off so I have to disconnect the battery when i turn the car off |
My vert had this problem. There's a plastic tab on the back of the brake pedal that depresses the brake light switch. If the tab breaks off, the brake lights will always be on.
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dirtratt
Offline
4 posts
1996 Nissan 240SX
Marianna Florida
10-18-2007
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| « Re: (NISTECH) | 1:45 PM 10/29/2007 |
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NISTECH I have searched through the posts and cannot find anyone with this problem(96 240SX Coupe) sticks in 2nd gear. I used to turn it off and on and it would clear but that doesn't work anymore. Any suggestions?
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mazinger-z
Offline
31 posts
90 240sx
phoenix arizona
12-23-2005
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| « Re: (dirtratt) | 8:03 AM 11/22/2007 |
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my car (90 hatch) problem is not the same as the others in here but may be you guys can help. when is on the D it doesn´t move but it does works fine if i start on 2 it runs first and second fine and then i move it to D and it shift the others fine. so what can be the problem and what should i do? thanks.
plans>income
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alex4
Offline
88 posts
89 coupe, 87 supra
North Alabama
7-9-2007
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| « Re: (mazinger-z) | 10:45 AM 12/16/2007 |
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Yeah, I've been having this exact shifting problem. Wouldn't go out of first sometimes, other than that it's fine. I read this forum and looked at that picture of where to unplug it. Driving home the other day, it would not shift AT ALL. I finally had to just stop and tell folks to pass me. I got out and unplugged it- ran perfectly.
Is this a hard replacement? If so, I'll have nissan do it, but I'd rather do it myself. Also how much does a new one cost from nissan?
Thanks
89 Coupe 5 spd
KYB Shocks, Complete Energy Suspension Bushings, K&N Filter, Circuit Sports Shift Knob
~~Also have a 87 Supra...the beast...
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ishkabibble
Offline
4664 posts
1992 NX2000 hardtop, 1993 NX2000 t-top, 1997 Infiniti I30t
Portland OR
11-5-2006
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| « Re: (alex4) | 1:35 PM 12/16/2007 |
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Just leave it unplugged. I've been running mine unplugged for months.
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MXMOVRDV
Offline
22 posts
94 240sx vert 66 mousestang
Raeford NC
1-27-2008
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| « Re: 94 240 conv with AT shift problems (oldbald_sarge) | 6:36 PM 1/27/2008 |
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 This article was so helpful and very informative that I feel like ripped some one off by not paying them for it. I followed this article and it helped me to fix my problem. It was a little tough replacing the switch due to very little room beside the trans. Had to take the trans mount off and PUSH the trans side ways to get the sensor out and in. Thank's again for all the info. This is why i became a member. To help out with my knowledge that I have. 
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airborne
Offline
21 posts
89 240sx fastback, 89 240sx coupe, 92 240sx convertible, 93 240sx fastback
ft bragg NC nc
3-6-2004
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| « Re: 94 240 conv with AT shift problems (kc240guy) | 4:53 AM 1/28/2008 |
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hey kc240guy,hey man i will be moving back to KC next year with my 240's. just trying to know some people around when i move back home.
Nissan, all the way
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