94 240 conv with AT shift problems

Re: 94 240 conv with AT shift problems (speedgods13)

kc240guy — 2009-10-20T19:39:05-08:00

My old vert had the stuck in first problem so I unplugged the rev sensor and it worked. Then a couple years later it started not going above 2nd most of the time. Since it was rusted all to hell anyway I got rid of it and now I have a rust free 5 speed coupe.

Re: 94 240 conv with AT shift problems (pktj21)

speedgods13 — 2009-10-14T13:27:07-08:00

Have not found a solution to it. Doing a 5 speed swap, and never buying an automatic 240 again, unless I have everything to to the 5 speed swap on hand.

Re: 94 240 conv with AT shift problems (speedgods13)

pktj21 — 2009-10-14T08:48:30-08:00

you still having issues or have you figured anything out?

Re: 94 240 conv with AT shift problems (pktj21)

speedgods13 — 2009-08-12T18:22:26-08:00

I've just learned to deal with it, until I swap out the automatic to 5 speed.

Re: 94 240 conv with AT shift problems (speedgods13)

pktj21 — 2009-08-12T14:53:02-08:00

did you ever find out what was wrong because mine is doing the samething

Re: (AZhitman)

kosh1986 — 2009-07-02T16:19:07-08:00

iv been having trouble with mine for a couple days now wont shift till around 3 grand rpms think on just doing a 5 speed swap also

Re: 94 240 conv with AT shift problems (speedgods13)

angHELLic — 2009-06-13T00:56:01-08:00

Hi guys just ran into a problem that i need help with - I have a auto 91 240, 120000 original km's, just had 5 bolt s14 brake upgrade : problem occured while pulling into my driveway, when in park it is impossible to shift into gear without the use of the shift release, drives fine in reverse, but when in D, 1, or 2 car barely moves forward...please help any advice would be greatly appreciated.

Re: 94 240 conv with AT shift problems (khmer1)

speedgods13 — 2009-04-08T14:38:54-08:00

My 240 has this problem. It shift perfectly from 1st to 3rd gear. Now, when going on the freeway, it will only shift to 4th, when the trans is cold. Once it warms up, it will only drive in 3rd. Another thing I noticed, is when it's cold, and I hop on the freeway, if I throttle lightly, it will switch to 4th. When warm this technique does not work. When it's warm, and I try to accelerate, it doesn't grab, and just revs from 2500-3500 rpms, going about 45mph. If I can't find a solution, i'm just going to do the 5 speed swap.

Re: 94 240 conv with AT shift problems (khmer1)

khmer1 — 2009-03-29T15:45:42-08:00

bump it i need answers?

Re: 94 240 conv with AT shift problems (khmer1)

khmer1 — 2009-03-27T17:26:07-08:00

ok so i just got my car back from the mechanic and he said it not the transmission it is something electrical and he said when he took off the tcu/tcm? he said he was able to manually shift from d1 to d2 to d3 and he checked the tcu/tcm opened it and said he didnt see no burnt circuit but had water marks soo any one know what might be the problem?

Modified by khmer1 at 7:59 PM 3/27/2009

Re: 94 240 conv with AT shift problems

khmer1 — 2009-03-26T18:21:06-08:00

hey yah im having a shifting problem my transmission doesn't upshift but you can manually shift it(1 to 2 to d but it doesn't feel like it even shift when you put it on D so yea)so it just climbing the rpm without upshifting and slowly gaining speed so i was wondering if this is a same thing as every one problems on it here would it work?but it seems like it from the 91-94 models with the ka24de dohc? would this be the same as the 89-90 sohc version the one with the sohc would it have almost all the sensor from the dohc

btw does anyone have a picture of the location of the rev sensor,the tcu,and maybe other sensor that might be the cause of this problem

and is the rev sensor plug at the same location as the dohc in the sohc..pics would be very helpful thanks

i just change my tranny but that didnt do anything good so now im looking for other causes and if fix it i be one happy sob and wouldnt regret getting my 240sx were i put so much money into just to get it running good

Re: 94 240 conv with AT shift problems (guyaverage)

saltfish — 2009-03-20T05:29:26-08:00

I could deal with the long shifts...I can't deal with going into failsafe mode. When it has happened I notice that stopping and turning the ignition off and on seems to fix it. It just sucks when you are on the highway at 6000rpm doing 30 mph with nowhere to pull over.

Re: 94 240 conv with AT shift problems (saltfish)

guyaverage — 2009-03-19T13:45:03-08:00

If by long 1-2 shift you mean it holds 1 until too high an rpm before it shifts, thats either a bad rev sensor, bad speed sensor, or the throttle position sensor is defective or out of adjustment. Unplug the rev sensor first.

If by long shift you mean it shifts at the proper speed, it just takes a while to get into 2, thats normal. The 1-2 shift in 240's is intentionally slow to smooth it out. There are ways around that. One involves replacing the 15 ohm dropping resistor with a 100 ohm power resistor (Radio Shack) or better but not as easy, replacing the 1-2 solenoid spring in the valve body with a larger spring from a 300zx or Pathfinder (i'm not sure which one has it but I bought a spare tranny from a guy that had the larger spring and it really firmed up and sped up the 1-2 shift nicely without being harsh.)

Re: 94 240 conv with AT shift problems (guyaverage)

saltfish — 2009-03-19T05:00:43-08:00

This forum is a great service to all Nissan owners...I'm a new owner of a 94 Vert and have been having trans issues (like nearly everybody at one point or another)

The car will drive fine (has a long 1-2 shift but I was dealing with that) then at about the same point in my daily commute the check engine light will go on and shortly thereafter the trans will go in failsafe mode....this sucks to say the least. In the past I have pulled over and put it in park and then back into drive and this has temporaily fixed it. Sometimes the check engine light will go off and other times it won't but it doesn't always go into failsafe but it usually does around 15-20 min into the commute almost always at the same place in the road.

After reading these posts I'm going to try disconnecting the rev sensor but it seems that helped people with the 1-2 shift...what about the fail safe problem? Is there something else I can do for an easier fix? Thanks!

Re: 94 240 conv with AT shift problems (speedgods13)

guyaverage — 2009-03-17T16:55:32-08:00

^^ Yes it may do that because the tranny ECU is detecting the sensor "missing" from the circuit. Not a problem.

Re: 94 240 conv with AT shift problems (DoctorRobert)

speedgods13 — 2009-03-11T19:03:50-08:00

To everyone who has disconnected their rev sensor, I ask you this: Did your o/d light start flashing? I disconnected mine, started the car, and no flash whatsoever. I haven't taken it for a test drive yet, but I will when I get off of work. I don't mind if it fixes the problem, and my o/d light doesn't flash. It would be even better, if it worked out that way. Well, that didn't fix it for me. I'm so pissed. I guess, it isn't going to be an easy fix.

Modified by speedgods13 at 6:54 PM 3/11/2009

Re: 94 240 conv with AT shift problems (guyaverage)

DoctorRobert — 2008-12-12T18:48:42-08:00

You know the car seems to drive much more sporty now that it's shifting off of the engine RPMs and not the revolution sensor.

Re: 94 240 conv with AT shift problems (DoctorRobert)

guyaverage — 2008-12-03T17:56:27-08:00

The solenoid(s) is/are inside the transmission, right on the other side of the pan if you remove it. You will have to remove the valve body (not for the faint of heart) if you want to replace all of them. It can be done with the transmission still in the car, though. They do go bad occasionally but late shifts are usually either the revolution sensor or the throttle position sensor.

Driving with the rev sensor unplugged wont hurt anything except maybe burn out your overdrive light sooner. You wont hurt the transmission or computer.

Re: 94 240 conv with AT shift problems (BiXLL)

DoctorRobert — 2008-12-02T22:03:25-08:00

Wow. I have had this exact problem with my car. Some days it's worse than others. Well, I just read this and, even though it's 1:01 AM, I had to go try it out on my car. I unplugged the revolution sensor, and took it for a very brief drive. It shifts differently now, but seems to have much better power. I haven't driven it long enough to find out if it's made a change to the shift problem, but I'm really counting on it.

Ok - so I do have a couple questions, one that has been asked before and I've never seen an answer to, and another...

While I do plan on replacing the revolution sensor eventually, it may be a while, so is there any chance my precious will be damaged running it like this?

Other one... Does it decrease gas mileage? One poster I saw said it did with his car, but I was wondering if anyone else found that to be the case. This car is kind of my daily driver currently, and while gas prices have greatly dropped, I do still feel cheap, ha, ha.

Thanks!!

mv520 — 2008-11-24T21:56:34-08:00

one question where is the automatic transmission solenoid located at?

Re: 94 240 conv with AT shift problems (mv520)

BiXLL — 2008-11-23T16:40:32-08:00

OK, I did the unplug of the Rev sensor and it fixed the shifting problem. Now, has it been decided how long we can run like this without causing other problems? I mean the Rev sensor was put there for a reason, can we run with it unplugged indefinitely?

Re: 94 240 conv with AT shift problems (edward08)

mv520 — 2008-11-20T15:57:54-08:00

is it hard replacing the solenoid?

Re: 94 240 conv with AT shift problems (edward08)

rcsister4 — 2008-10-05T20:18:43-08:00

I have 2 92 240SX cov. Am new with all this and really learned a lot, pretty over wellming, My red one won't go into overdrive, the O/D light comes on, but that's all. I'm going to try some of the things I read tonight and see what happens. I also love the cars, I drive all kind of cars at the car auctions I work at but there is nothing that is as much fun to drive as they are. Thanks guys http://forums.nicoclub.com/zer...11657#

Re: 94 240 conv with AT shift problems (240sxdrifterS14)

edward08 — 2008-09-16T18:48:27-08:00

I had replace the shift solenoids and i had never had the problems ever again.

Re: 94 240 conv with AT shift problems (airborne)

240sxdrifterS14 — 2008-09-07T17:05:52-08:00

Thank you to everyone who helped bring this to an end!!! So far since I disconnected the sensor I have no problems hopefully it stays this way. Finally I have fallen in love with my car.

Re: (Seiferliny)

kc240guy — 2008-03-12T21:54:21-08:00

so back in the day i unplugged the rev sensor and went on my way with no issues. now my car wont shift out of second to 3rd at all. it started just shifting late so i thought it was the tps so i unplugged it and it shifted earlier. now it wont shift whether its plugged in or not and when i plug the rev sensor in it doesnt even shift out of first at all.

Re: (NISTECH)

Seiferliny — 2008-02-28T10:26:10-08:00

Hey guys I'm having some automatic transmission problems. I had just bought a 93 240sx se convertible and on my way home not even 20 mins in the transmission started having problems....

When i test drove it, it shifted perfect....around the same time the transmission started having problems my lower radiator hose split don't know which one occured first guessing the hose.....well i replaced the hose but the transmission is still having problems I didnt drive to far once the tranny started acting maybe a mile or 2 then i pulled over and fixed the hose....and drove it home bout another 5 miles maybe....

Now the tranny is still messed up from what i can tell it shifts from 1st to third because i manually was shifting and i went from first to second and nothing then once i put it into drive it shifted not really sure if its third cause when i down shift to second nothing happens but when i go to first it down shifts and has a bit of leeway when giving it gas before the gear starts to pull when releasing the gas and giving it gas again another weird thing i noticed was when the rpms are getting higher my temperature gauge starts dropping it hits cold then the tranny shifts usually very erratic shifting times sometimes it will do it at 3k lil hard and usually its between 4-5k

I read this forum about the rev sensor and all that i pulled it and nothing changed....

any ideas anyone ?

NISTECH please bestow upon me your great knowledge!

Re: 94 240 conv with AT shift problems (airborne)

airborne — 2008-01-28T05:18:57-08:00

this whole thread has made me scared as crap helped me decide to just change to manual. good thing I have an extra manual tranny and basically everything else on hand except for the pedals.

I bought a 92 convert that i need to pick up in ends of mar 08 and i dont know what kind of tranny problem might have. got it on ebay for 1700 from a dealer. they say it misses a little bit. who knows.

I can rebuild a manual with my eyes closed but an auto, no way. thank god all my other 240's are manual. I cant wait to get back home and get all of them painted, the fast back will be blue and the coupe and vert red. I will post pics when i start doing mods.

Re: 94 240 conv with AT shift problems (kc240guy)

airborne — 2008-01-28T04:53:51-08:00

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.

Re: 94 240 conv with AT shift problems (oldbald_sarge)

MXMOVRDV — 2008-01-27T18:36:41-08:00

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.

Re: (alex4)

ishkabibble — 2007-12-16T13:35:11-08:00

Just leave it unplugged. I've been running mine unplugged for months.

Re: (mazinger-z)

alex4 — 2007-12-16T10:45:10-08:00

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

Re: (dirtratt)

mazinger-z — 2007-11-22T08:03:20-08:00

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.

Re: (NISTECH)

dirtratt — 2007-10-29T13:45:14-08:00

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?

Re: (nosferatu226)

omg240 — 2007-09-18T19:32:40-08:00

Does anyone know Nissan's part number for the revolution sensor?

Quote, originally posted by nosferatu226 raquo;

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.

Re: (omg240)

ishkabibble — 2007-08-24T05:41:45-08:00

If your rotational sensor is bad, probably.

omg240 — 2007-08-24T02:21:22-08:00

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?

Jesda — 2007-08-01T19:16:39-08:00

Happened to me once. I bumped it into neutral and back into drive, and all was well.

Re: (nosferatu226)

nosferatu226 — 2007-08-01T18:34:10-08:00

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?

ishkabibble — 2007-07-29T06:27:09-08:00

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.

Re: (nosferatu226)

nosferatu226 — 2007-07-26T15:38:54-08:00

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

Re: (aradapilot)

nosferatu226 — 2007-07-24T14:17:54-08:00

aradapilot, where is the tps located? you wouldn't happen to have any pictures would you?

Re: 94 240 conv with AT shift problems (kc240guy)

LushPenguin — 2007-07-22T20:41:29-08:00

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"

Re: (NISTECH)

LushPenguin — 2007-07-22T20:35:49-08:00

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"

Re: (aradapilot)

nosferatu226 — 2007-07-20T21:30:29-08:00

thanks for the info, let me know how it turns out

aradapilot — 2007-07-20T12:05:19-08:00

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.

Re: (aradapilot)

nosferatu226 — 2007-07-19T18:07:44-08:00

I've got it in a shop right now. Hopefully they can figure something out. I'll post it if they do.

Re: (nosferatu226)

aradapilot — 2007-07-19T11:07:57-08:00

could be tps or vss...it's going to be hell pulling my atcu out.
any other ideas?

Re: (aradapilot)

nosferatu226 — 2007-07-19T02:11:05-08:00

Quote, originally posted by aradapilot raquo;

yeah thats exactly what happens in mine.

aradapilot — 2007-07-18T17:26:02-08:00

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.

re:

aradapilot — 2007-07-18T12:20:21-08:00

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.

Re: (NISTECH)

nosferatu226 — 2007-07-16T22:13:55-08:00

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

Re: (NISTECH)

Pathfinder_1997 — 2007-05-03T14:57:36-08:00

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!!

Re: 94 240 conv with AT shift problems (tumolt)

MNVERT — 2007-04-17T13:33:27-08:00

Quote, originally posted by tumolt raquo;

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...

Re: 94 240 conv with AT shift problems (oldbald_sarge)

tumolt — 2007-04-16T17:54:44-08:00

Re: (Florida240sx)

MNVERT — 2007-04-10T00:15:28-08:00

my tranny wont shift into any gears when in drive,reverse,etc. anyone had this problem b4?

Florida240sx — 2006-10-11T15:04:36-08:00

Been going good now for 3 weeks Too ba dmy engine is toast, and now swapping in a vg30dett

acidbbg — 2006-10-11T00:16:00-08:00

good work guys!

Charlie

Re: 94 240 conv with AT shift problems (kc240guy)

Glyph — 2006-09-17T03:03:25-08:00

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.

Re: 94 240 conv with AT shift problems (jamesblonde82)

kc240guy — 2006-09-16T22:45:30-08:00

the fuse box behind the battery. there is a set of plugs behind that box. pull the top one.