yea so here is another issue with my car... the car wont rev past 2500 rpms... at first when i heard it, MAF sensor came to mind but i just chaned and use datdude20 MAF sensor and it still wont go past 2500... i was talking to aackshun and he asked what codes did i get for the transmission.. which i do have a bunch of them but he said the code for transmission selenoid is the reason for it going into limp mode... now my question is, without going through the full ECU swap which im not doing, what is the way around tricking the ECU to not go into limp mode???

 

I have never had a car go into limp mode so excuse my question if I am way off base, but resetting the fault codes with an ODB2 reader or with the pedal dance to reset fault codes ... would this not reset the ECU from the limp mode of course if the problem is sever the codes will reappear quickly.

 

My dad had that same problem i heard get Viagra

 

we tried resetting the codes... nothing... i thought the same... basically the ECU is thinking the tranny is fcuked, and i need a way around that

 

.................................................. ..... right joke, wrong time

 

MAF, MAF, MAF.

It is either a wiring issue or a bad MAF. Check your wiring. The only other time i know of these cars to limit there revs is when they overheat.

Awkward as this might sound my friend's 350Z went into limp mode on a bad knock sensor so check that aswell.

 

You know theirs a guy in NYC maxima he figured a way to by pass it So the car won't go in to limp mode can't remember his name tho... I'm sure he showed up in the ghusler thread and talked about it once about how to by pass it IF i remember correctly

 

lol yea my 4th gen went into a semi limp mode off knock sensor once but knock sensor is good and i didnt have to wire up a MAF... its plug n play, un installed my bad one and used manny's, the good one... read the 1st post... MAF was my 1st thing, but no buddy its not that

 

his name on NYCnissans is Ohh noes and i think its like Max0225 here, something like that, he is very rearly on any forums so i cant really get to him at will

 

yea but maybe hes got an home page or a link to his nyc maxima name or email address

 

i know he did explain it on the ghustler thread your just going to have to go back and readddddddddddd...........

 

that would take years... lol

 

i would start from page 600 it cant even be that far back and read ... i think you'll get your answer faster that way honesty... get some body to start at page 500 to 700 and you start from 700 up

 

if you remember.. ill check... i even tried doing post by him and nothing... he did post in the "ghustle down........ again" thread but nothing to do with the issue i have

 

Have you tried disconnecting the negative side on the battery for a short period of time? to assist in clearing the ECU

The other thing I keep reading is to check the wiring going into the MAF sensor make sure there is no line break or wire pulled from making a connection.

Limp mode is described as the ECU cutting signal to the MAF and fuel systems

 

here is a question... going to a 6spd ECU would it be just plug n play??? im really not trying to get rid of the auto ECU

 

you know what... this is a possibility.. the wire is pulled from having no mid pipe

 

Have you tried to contact Aaron92SE as he seems to be the guru on the ECU swap and perhaps he can answer a possible way to fool the ECU & limp mode

 

another good one

 

it would plug right in, but from what i read you need to have it programmed for your key

 

so there is no re wiring needed??? why did i thought you needed to re wire the dash hardnes??? where'd i get that???

 

a few interesting comments on getting the ECU into closed loop in this link
http://www.elantraxd.com/forums/show...n-ECU-tweaking...

 

This is a good idea. Drain the ECU and Tranny ECU batteries down, causing them to forget everything that ever happened, then see what happens. Monitor your codes IMMEDIATELY after restarting, if one pops up, shut the car off and check it right away. Check it every few miles/hours afterwards, in case another code pops up. This way you can catalog all fault codes. Then, if the car goes into 'limp mode' again, shut it off, and check for any new codes.

I've never heard of such a killer limp mode on the Maxima, but I've never dealt much with the 5.5+

I'm fairly certain the 5th and older don't have a limp mode that would cause this.

You said you checked codes, didn't post though, what do you have right now?

 

im not 100% on it to be honest, i just recall guys wanting to get junkyard ecus and send them out for a flash, but their cars would run cause of the nats system? i think thats what its called

 

here is a loooooooooong shot... can this be a possible problem.. i haven looked at it yet... now with the battery gone dead and all, would the VAFC have resetted itself to default settings causeing this problem??? just a long shot

 

adjust the tps? i had same problem i just relearned my tps and reset codes and it works great now

 

i cant remember but im getting all tranny codes (which is cool being as though im using the auto ECU, the only one im not sure about is tranny selenoid... the car was at the shop when the code was checked so i dont remember

 

one guy from NYC was trying to sell me the ECU harness

 

Unhook battery, rehook, DO NOT clear codes. Leave CEL on. It should rev past 2500 now

 

o.k ill try that tomorrow... i have no tools right now

 

Ok. LMK how it goes.

 

so in no possible way can vafc cause this????

 

Do you need to ground or apply 12V to the PNP switch? Then maybe the same with the solenoid harness?

 

I had a safc2 before and I pulled it out my wrecked 5th gen and hooked it up to a 4th gen months later and the settings were still saved. So I don't see why the vafc would reset anything, the same settings should still be there it only resets when you reset it yourself through the menu.

 

oh o.k .. just checking... botch that then
mmm... i dot even know what that look like or how to do it

 

alot more than fuel cut goes on in fail safe or "limp" mode. in some cases the injectors go into simultaneous injection and all fire twice per cylinder per revolution, along with timing, throttle position opens at a set % and i would assume a/f. I had a maf go out and it caused the ecu to enter fail safe mode and had fuel cut at 2400 rpm.

its detailed in the FSM for what codes will cause it to enter fail safe mode.
P0102, P0103,P1102,P0117, P0118,P0221, P0222,P0223, P1223,P1224,P0226, P0227,P0228, P1227,P1228,P1121,P1122,P1126,P1129

 

Did you have a look at the AT section of the FSM? There are many things that will cause limp mode from the tranny. You need to somehow tell the TCM that everything is there and working. Like I mentioned solenoids and park position switch. Also TPS, speed and rev sensors. Good luck.

 

^^^^ that's what I'm trying to figure out how to do.... how do I tell it everything is o.k????

 

Easiest way is to swap in the ecu from a 6spd maxima and have your key programmed to it. The actual ecu connector is the same on the auto and maxima harness so it will plug in. However the auto engine harness has plugs that go into the TCM. Probably the guy that was telling you to install a harness was because so you would not have those spare connectors and because the maxima manual harness also has the connectors for the solenoids on the manual trans.

Have you touched any of the wiring on the car when you did the swap?

 

Never messed with any wiring except the one to fool the ecu fr park n neutral... green w/orange stripe... that's it