stuck in gear please help

[al240sx]

I HAVE A 1995 NISSAN 240SX AND IT SEEMS TO BE STUCK ON 2ND GEAR FROM START IT WONT CHANGE FROM 2ND TO 3RD OR WONT START FROM 1ST.I GOT A CODE P1605 ABOUT THE A/T Dignosis Communication line.I have checked for continuity between the a/t control unit and the ecm and it has continuity i checked the harness and pins they seem fine.I messed a little with the tps but not to much since it runs fine just in one gear.ANY HELP WILL HELP ME OUT PLEASE IF ANYONE HAS GONE THRU THIS LET ME KNOW WHAT WAS THE FIX.I have also replaced the transmission since i got it at a good price from a friend.And the problem was there even with the other transmission that was the original one.

[GEO]

ECU

[Mr1der]

bah, just convert to a 5 speed:D

auto's no fun!

[al240sx]

OJ THIS IS WHAT HAPPEN ITS MY BROS CAR HE SOLD IT TO ME FOR 400 AND I PUT ANOTHER transmission OF A 98 CUSS MY FRIEND HAD ONE.THE PROBLEM IS STILL THE SAME WITH THE OLD transmission.THE THINK IS THAT HE TOOK IT TO PEP BOYS TO GET HIS CHECK ENGINE LIGHT CHECKED.SO THEY PUT IT ON THE COMPUTER TO SEE THE CODES AND THEY TURN OUT SAYING THERE WERE 3 ERROR CODES(DONT REMEBER WHICH ONE).THEY ALSO TOLD HIM THERE GETTING AN ERROR FROM THE TRANSMISSI0N COMPUTER AND HE NEEDS TO TAKE IT TO A TRANSMISSION SHOP TO GET IT CHECKED AND FIX.SO HE DROVE OUT AND WHILE HE WAS DRIVING THATS WHEN IT GOT STUCK IN ONE GEAR IT WAS NOT THROUGH NO OTHER GEAR.SINCE THEN WHEN I START THE CAR UP ITS ONLY IN ONE GEAR I THINK ITS 2ND BUT NEVER THROUGH THE NEXT ONE.CAN IT BE POSSIBLE WHEN THEY DID THE DIGNOSTIC THEY MIGHT OF DONE SOMETHING TO MAKE THE CAR REACT LIKE ITS DOING.HE ALSO TOOK IT TO A transmission SHOP THEY TOLD HIM IT CAN BE IN SOMETHING ABOUT SAFE MODE AND KEEPING IT ON THAT GEAR TO PRVENT IT FROM DAMAGIN SOMETHING.AND HE MENTION U MIGHT BE ABLE TO LEAR THE CODE AND THEN IT WILL WORK FINE.IS THAT ALL TRUE OR BULL&*%.AND COULD OF PEPE BOYS DID SOMETHING TO MESS IT UP LIKE THAT OR IT JUST HAPPEN?

ANYINPUT WILL HELP ME OUT PLEASEEEEEEEEEEE I WANT TO GET THIS CAR STARTED RIGHT UP BUT NOT SURE WHAT TO DO OR TAKE IT TOO.I RAN THE OBD2 TEST AND GOT CODE P1605 AND I HAVE CHECKED FOR CONTINUITY BETWEEN THE A/T CONROL UNIT AND ECM AND I GOT CONTINUITY I HAVE CHECKED THE PINS THEY ALL LOOK CLEAN.

PLEASE HELP ME OUT.

[al240sx]

OJ THIS IS WHAT HAPPEN ITS MY BROS CAR HE SOLD IT TO ME FOR 400 AND I PUT ANOTHER transmission OF A 98 CUSS MY FRIEND HAD ONE.THE PROBLEM IS STILL THE SAME WITH THE OLD transmission.THE THINK IS THAT HE TOOK IT TO PEP BOYS TO GET HIS CHECK ENGINE LIGHT CHECKED.SO THEY PUT IT ON THE COMPUTER TO SEE THE CODES AND THEY TURN OUT SAYING THERE WERE 3 ERROR CODES(DONT REMEBER WHICH ONE).THEY ALSO TOLD HIM THERE GETTING AN ERROR FROM THE TRANSMISSI0N COMPUTER AND HE NEEDS TO TAKE IT TO A TRANSMISSION SHOP TO GET IT CHECKED AND FIX.SO HE DROVE OUT AND WHILE HE WAS DRIVING THATS WHEN IT GOT STUCK IN ONE GEAR IT WAS NOT THROUGH NO OTHER GEAR.SINCE THEN WHEN I START THE CAR UP ITS ONLY IN ONE GEAR I THINK ITS 2ND BUT NEVER THROUGH THE NEXT ONE.CAN IT BE POSSIBLE WHEN THEY DID THE DIGNOSTIC THEY MIGHT OF DONE SOMETHING TO MAKE THE CAR REACT LIKE ITS DOING.HE ALSO TOOK IT TO A transmission SHOP THEY TOLD HIM IT CAN BE IN SOMETHING ABOUT SAFE MODE AND KEEPING IT ON THAT GEAR TO PRVENT IT FROM DAMAGIN SOMETHING.AND HE MENTION U MIGHT BE ABLE TO LEAR THE CODE AND THEN IT WILL WORK FINE.IS THAT ALL TRUE OR BULL&*%.AND COULD OF PEPE BOYS DID SOMETHING TO MESS IT UP LIKE THAT OR IT JUST HAPPEN?

ANYINPUT WILL HELP ME OUT PLEASEEEEEEEEEEE I WANT TO GET THIS CAR STARTED RIGHT UP BUT NOT SURE WHAT TO DO OR TAKE IT TOO.I RAN THE OBD2 TEST AND GOT CODE P1605 AND I HAVE CHECKED FOR CONTINUITY BETWEEN THE A/T CONROL UNIT AND ECM AND I GOT CONTINUITY I HAVE CHECKED THE PINS THEY ALL LOOK CLEAN.

PLEASE HELP ME OUT.

[al240sx]

Ok THIS IS WHAT HAPPEN ITS MY BROS CAR HE SOLD IT TO ME FOR 400 AND I PUT ANOTHER transmission OF A 98 CUSS MY FRIEND HAD ONE.THE PROBLEM IS STILL THE SAME WITH THE OLD transmission.THE THINK IS THAT HE TOOK IT TO PEP BOYS TO GET HIS CHECK ENGINE LIGHT CHECKED.SO THEY PUT IT ON THE COMPUTER TO SEE THE CODES AND THEY TURN OUT SAYING THERE WERE 3 ERROR CODES(DONT REMEBER WHICH ONE).THEY ALSO TOLD HIM THERE GETTING AN ERROR FROM THE TRANSMISSI0N COMPUTER AND HE NEEDS TO TAKE IT TO A TRANSMISSION SHOP TO GET IT CHECKED AND FIX.SO HE DROVE OUT AND WHILE HE WAS DRIVING THATS WHEN IT GOT STUCK IN ONE GEAR IT WAS NOT THROUGH NO OTHER GEAR.SINCE THEN WHEN I START THE CAR UP ITS ONLY IN ONE GEAR I THINK ITS 2ND BUT NEVER THROUGH THE NEXT ONE.CAN IT BE POSSIBLE WHEN THEY DID THE DIGNOSTIC THEY MIGHT OF DONE SOMETHING TO MAKE THE CAR REACT LIKE ITS DOING.HE ALSO TOOK IT TO A transmission SHOP THEY TOLD HIM IT CAN BE IN SOMETHING ABOUT SAFE MODE AND KEEPING IT ON THAT GEAR TO PRVENT IT FROM DAMAGIN SOMETHING.AND HE MENTION U MIGHT BE ABLE TO LEAR THE CODE AND THEN IT WILL WORK FINE.IS THAT ALL TRUE OR BULL&*%.AND COULD OF PEPE BOYS DID SOMETHING TO MESS IT UP LIKE THAT OR IT JUST HAPPEN?

ANYINPUT WILL HELP ME OUT PLEASEEEEEEEEEEE I WANT TO GET THIS CAR STARTED RIGHT UP BUT NOT SURE WHAT TO DO OR TAKE IT TOO.I RAN THE OBD2 TEST AND GOT CODE P1605 AND I HAVE CHECKED FOR CONTINUITY BETWEEN THE A/T CONROL UNIT AND ECM AND I GOT CONTINUITY I HAVE CHECKED THE PINS THEY ALL LOOK CLEAN.

PLEASE HELP ME OUT.

[Q45tech]

Fail Safe Mode locks the transmission in one gear.For $400 you get the honor of spending thousands to rehabilitate a car.

And this is what kind of an infiniti?

[al240sx]

is there a way that i can clear it or how do they clear it?

thanks for the fast reply

[PalmerWMD]

Moved cfrom engineering forum:

Al we need a lot more details like what car and year?

Fred..

PS: And keep the caps off..

[rudee023]

I had the same problem a while back. Have the the shop check the clutch master and slave cylinder.

[al240sx]

its a 1995 nissan 240sx automatic

please help

[droll]

Yes, there is a feature called "limp in mode." Usually it sticks you in 2nd gear. This happens when there is some sort of malfunction with the controls of the automatic transmission. The computer sees a problem and then puts the car in limp in mode so you can "limp" your *** to a service center. I don't see how the Pep Boys people could have done somthing to cause this since they only hooked a scan tool up to it.

[al240sx]

lol i guess ill limb my a55 to the service to get it checked and reset.thanks for the info and do i have to take it to the dealer for that and do u have any idea how much it cost.cuss my a55 is in a budget with drama?

thanks again droll and all :thinker

[droll]

The cost depends on what's wrong with it. What was the original problem with it before you put the second transmission in?

[al240sx]

the orignal problem was the same ,stuck in one gear and i had the check engine light on so i put the other transmission and same problem i put the obd2 scan and got error code p1605 something with the a/t control unit so i checked for continuity between the ecm and a/t control unit and i got it.so i no no now?

[Altiman94]

Its an auto. Try to reset the ECU

[al240sx]

i did cleared it but comes back disconncted the battery for a one day about 24 hrs goes off for a couple of hours then comes back code p1605.

[droll]

That code is for a problem with the communication between the transmission controlerl and main computer. It could be that the control controller is bad, but this would take more thorough diagnosing.

[al240sx]

i haven been trying to see what sensors to check they told me it can be the tps, or the a/t control unit itself and or maybe need to clear the safe mode if its stuck on it so i might end up taking it to the shop i would like to do it my self but to many f*@$% sensors that i should check and i dont know were to start. i will adjust and check the tps i guess first?

or maybe go to the junkyard and snatch me a a/t control unit

[droll]

Yeah dealing with trouble codes is not the easiest of DIY projects. Codes need to be looked open, reset, tested, etc. Its not something easily done without a scan tool. Though OBDI is much easier for a DIYer than OBDII.

[al240sx]

for some reason do u think if my transmission is stuck in one gear from start it can still be a bad tps or needs to be readjusted. cuss i have notice that most troublshooting guides u give out have to do with the tps? also can u tell me what else i can check other then the tps. this is my problem my car 1995 nissan 240sx auto wont go to no gear only stays at one gear got a code p1605 i checked for continuty between the a/t control unit and the ecm and i do have cont.i have replace the transmission once cuss i had a friend who had a spare good transmission same problem.my o/d light does not turn on at all and when i push the o/d button still same gear no difference if i shift from d to d1 or d2 same shift no change.it was my bros car and it all started cuss he had the check engine light not coming on with the key switch on but not the car running so he replaced the light buld for it to show and it showes it now.so he took it to pep boys to get it check the check engine light hat is(car trannys was still fine) they put the scanner on it rec 23 codes dont remeber what they were i think one was some oxygen sensor. when he step out of pepe boys he was driving and thats when it got stuck on a gear. the o/d light still turned on when u turn the switch key on.after a while the light dont come on that is the o/d light.so i really dont know what to check some people say its the transmission others say its some electrical problem just give me a clue what to check and look for and can the car be at limp in mode safe mode.if so how can i reset it or clear it i tried clearing the code p1605 check engine still comes back.

so please help me out anyone please:help (i know it was alot to read sorry)

[Need4Speed]

Need more info to be able to help you:

Infiniti...yes?...no?

Model?

Year?

Mileage?

Etc., Etc. Etc.

[NISTECH]

if You could find out the other codes that could help with this. I suspect one of the other codes was PO500 which is speed sensor code. If that was it you may have a problem with the speedometer head [ pretty common] If the speed code was not one of the other three codes then those codes may have been PO733 PO734 or something in the PO7XX area the cause of those is typically the TPS.

Could pep boys of screwed it up, not likely if they just plugged in and checked codes.

The transmission shop is probably correct, Its probably in fail safe mode which is 3rd gear. That happens when the trans control module does not recieve enough information to decide what gear it needs to be in or when to shift it. This is what the PO1605 code is telling you, It did not recevie accurate info from the ECM on that wire you checked so it went into fail safe and threw that code. That does not mean the wire is the problem it only means it didnt see what it expected to see during certain conditions.

See if you can recall those other codes to help determine what step to take next.

[NISTECH]

well I see most of this was covered in your second post but i will merge it with the other one any how.

[NISTECH]

Dude stop posting all over nico. Pick a forum for your problem and stick with it. PLEASE!!!

[al240sx]

sorry about all those post i tried to post it twice and some how it got all over sorry again.thanks alot for all the info and input knowldege sorry if im being a pain in the over there but some people like to make money out of those that dont have enough. ill see if i can find out about those other codes.and do u think the tps can make it act like its acting should i just replace it or try to adjust it.in other worlds would it make a difference to my car if i do adjust it or replace it.

to infinityyyyyyyyyyyy and beyonnnnnnnnnnnnnnnnnnnnnn

:icesangel

[NISTECH]

Your TPS wont cause it to go into fail safe. It will only cause the PO7XX codes I mentioned. You car is in fail safe because it either got garbbled info and doesnt know what gear to put it in or it cant mechanically attain the gear it tries to request. Fail safe is a safety lock out to prevent a catostrophic failure from occuring. This is why you need the other codes it may lead to what caused it to go into fail safe.

[al240sx]

thank god for helpful people like u.i bet u feel good when u help us people like me and u should. if i figure out what the other codes were and i fix those sensors or so. would it clear safe mode or what do i have to do to clear it from safe mode?

thanks for the fast respond

[NISTECH]

Every time you turn the car off it starts over and looks for certain info if it sees all important info clearly and no malfunctions are detected it will be out of fail safe. It goes into fail safe each time you start the car if it sees a problem, it doesnt just stay in that mode.

[NISTECH]

Here is your best course of action at this point. Take your car either to a nissan dealer or to a shop that has a Snap-on scanner and have them pull the codes from the TCM not the ECM. Alot of codes stored in the TCM will not come up in the ECM so you cant pull them by turning the screw on the ECM.

I have to take back something I said about the TPS not throwing it into fail safe. Potentially it could in 1 certain event. The TCM looks at 2 signals from the TPS. One is from the variable voltage portion and one is from the hard contact portion of the TPS. It interpits the voltage part in 8ths so if it were to see say 5/8 throttle opening from the voltage portion yet see the hard idle contacts closed it would confuse it as to what the engine was really doing and could not determine where to put the trans. Allthough this does not happen very often it could do that. I personally havent seen a TPS throw a trans into fail safe.