Anyone else have the EVAP Code after recieveing their JWT ECU and installing it ??

I was wondering if its a generic problem or just my case ?? My evap canister and all that stuff is all new from nissan so i dont know what its reading wrong ??

BTW: I have it programmed to ::
370cc injectors
Z32 MAF
S/C Program
7200 RPM Rev limiter...

 

there is more to ur EVAP system than just the canister...there are line and hoses all over the car for it

 

Where'd you get the ECU that they reprogrammed.

 

hey, i know "possibly" what the deal is. lookie here, i talked this problem out before in this thread:

http://forums.maxima.org/showthread.php?t=394807

i think jwt gave you a 95 reprogged ecu, according to your info, you have a 96 max. i've heard of many people sending in their ecu's and they receive back ecu's that are not theirs. jwt thinks it's all the same.

i know for sure we get 8 evap codes if i run a 96 ecu in a 95's evap setup. i know also that there is at least a set of 2-3 codes from the evap if you run a 95 ecu, the one the controls the canister evap, onto a 96 max, which runs an electronic evap.

as far as the problems go, they are equally interchangeable and still runs strong. however, i think jwt's advance timing isn't activated with these codes laying around. in my knowledge, once an ecu has a engine light on, it runs in a safe mode, doesn't allow advance timing, air/fuel map may still be present, ext redline may still work, but i'm pretty sure the jwt's advanced timing feature isn't activated once the codes are up. so basically, if you have this problem, you are not running your ideal potential.

does this help?

 

I don't know where you get that idea and your explanation is kinda retarded. JWT's timing isn't "activated"? Do you know how the whole process works or are you just kinda making things up in your mind and guessing?


Matty, if you indeed got your own ECU back there really shouldn't be any reason for what JWT does to throw a CEL for the EVAP system. Did you "mark" your ECU or write down any identification #'s on it before you sent it in? I did when I had my NA program done, I was always worried about them trying to send me a different ECU than my original. At the same time, using a different year ECU generally causes more than one CEL, I would expect to see multiple codes. I have messed with 4th gen ECU's alot and there are tons of different model ECU's even for the same year and tranny type, and none are exactly the same unless the model # is exactly the same.

 

No that's not the case at all... check engine light and these codes doesn't have anything to do with the advanced timing. You still get all the performance benefits, even with your ECU throwing ten million codes like my old one did.

 

well, i am glad you are correcting me. i'm not sure what the deal is then. i know i can always reset the ecu and make the codes disappear. but then i can crank up the engine and run without a code, but once i shut if off and turn it back on again, the evap codes showed up again. and that's a way i deal with these codes, but i don't want to reset my ecu every time i drive.

also, i noticed a significant performance difference running the car with and without the cel's. it seemed like this engine light does affect performance. it was out of my expeirence, there is no two ways about this phenomenon.

about the explanation that you call retarded, i have only assumed a safe mode to have occured when the cel is on. about advance timing, i haven't gotten that far of knowing the whole thing, yet. so yes, you are right, mike. i stand corrected, i was guessing my days off about it, not knowing how it really worked. so i'll claim my appologies right now about what i said, and i don't have to go back and edit that post to cover up my mistake. thanks alot mike.

well, at this point, i just hope to help out the guy figuring out his problems. i am pretty sure the 95 and 96 ecus' interchangeability is bottlenecked by this evap difference. that's the main thing i'm aiming to tell him. what's your input on this, mike?

 

The only code I see making a difference is a 0304 since that is the only code that can send the computer into the "low octane" map. It is actually called the "low octane map", but people please don't think that it means you ECU can detect your octane level and change maps. It is just called that, it is just a retarded timing map your ECU can switch to if there is not a working knock sensor, ie; 0304, or your getting detonation or pre-ignition.

 

ok, so there's that much different ecu's for even the same year models? dude, i am becoming very lost about this ecu thing. well, so evap isn't the only thing we will have concerns about. then i'll have to be very careful because i am tired of my 8 evap codes; and i am guaging to send in my own stock ecu in for reprogs. well, if it gets that serious; i better make sure i get my own ecu back. thanks for clearing these things up mike and neal.

 

yeah, along with those 8 codes, i read 0304 many times, too. that could have been evap related, or it could have been just a real bad knock sensor. however, running back with my stock ecu. i do not get any codes at all. and 0304 doesn't even come up. so i guess my "sense" of significant performance loss is probably due to that knock sensor code that sometimes come up and down and cause a retarded timing map to be used. then that all makes sense. well, i just bought a new knock sensor anyway, but i'll see to install it later on, after my stock ecu gets reprogged, if it still comes on, i'll change it in...

 

I would not be sure about performance loss with light CEL's unless you had a dyno or even track times to back it up. The car can "feel" different and the cause be assumed to be a CEL, when really it could either be a totally unrelated reason like weather changes or it just being in your head. Here are two examples that prove that CEL's don't automatically cause a car to read off the "low octane" map or go into "retard mode". Neal had two ECU's. His factory 96 5spd ECU that came with his car and caused no CEL's. He did two dyno pulls with that ECU. He then switched out ECU's to a 98 auto ECU which right away tripped a buch of codes. Did two dyno pulls with that ECU and got the exact same #'s as his stock ECU. No power difference between the two ECU's. Another example is that I am running a 98 maxima auto ECU in my 5spd I30t. You couldn't get any more different type ECU's for our cars. I constantly have a CEL for 12 different codes. VIA my SAFC my MAF voltage, which is directly related to power, is the same with the two ECU's. Neal ran his PB in his old black NA car with 02 sensor CEL's. This is how I know that a CEL does not automatically cause a car to go into "limp mode". The only code I know of that causes that to happen is the 0304 code. And it is really not the function of the little light being illuminated on the dash, but the relationship between the ECU's map and the kncok sensor. The CEL is seperate from the whole process.

The way a JWT ECU works is very simple, not simple to do, but simple how it works. Our cars have set WOT or open loop maps that determine ignition timing and AF ratios. JWT simply makes a daughter board with a burned chip that contains modified open loop ignition and AFR's. When the car goes into open loop it reads off the JWT daughter board with the modified maps instead of the stock open loop maps.

 

ah, words of wisdom, i see. mike. thanks a lot. i'm getting better at this now. in 2 more semesters, i'll be taking the internal combustion class, that's when i'll get into further details of how everything works. right now, i'm still doing thermofluids and instrumentation classes. i'll be up there soon. but thanks for the explanation. we kinda jacked this thread from matty, sorry mat.

 

Well when I sent my Computer in, Right from my Car (I bought one, to use in my car while I send mine in) I marked it up with a marker with my name, address, year, model, 5spd, all that stuff..I should have ground my name into the metal...when i got it back none of that was on the computer...I didnt think anything of it...well I put it in the car and I get the EVAP code...JWT claimes they clean the computers off with paint thinner before they go and re-do them...JWT said there is no real reason why i didnt get "my" computer back..

I just dont know why the JWT modle ECU would trip an EVAP and when it was stock ECU progrom it wouldnt ??? this is why i went through the time and wrote on it...

-matt

 

I just dont know what to do now...I went like 30K miles without a code..now the JWT is in, and Im getting this stupid code..even with my comptuer that I had in for the time being, there was NO codes

-matt

 

They clean it with paint thinnner??? Why in the world would they do that, sounds like a bunch of BS to me.

 

me too.....

 

Hi.

I can't open a new thread, since I am a newcomer. However, my problem is related to changing the ECU. I need some advice. (MAXIMA 1999)

Here is the story:
1) The car has beed working rough every now and then for a year.

2) The fuel pump has been noisy for a couple of weeks.

The gas tank was almost empty. I drove the car to the mall. when I came back and started the car, the car turned on and ran for 10 seconds and went off. In the second trial, the car ran for 2 second and went of as if it was out of gas. I filled the gas tank with a gallon of gas but the car never turned on again.

I towed the car to a mechanic with a suspicion of fuel pump breakage. The mechanic diagnosed the same thing based on the fuel pressure and changed the fuel pump. The car did not start. After working on it for a day, he told me that based on the symptoms the immobilizer had been activated for some reason and sent me to the dealership (read hell) after charging me for the fuel pump!!!

After "working on it" for two hours, the dealership diagnosed that the ECU is dead!

Now my questions:
1) Knowing that the dealership was really upset why I had not brought the car to them at the first place, do you think if they have changed my ECU with a dead one?

2) He wants to charge me $900 for a new ECU and $400 for re-programming and installation. However, I know a used ECU for $350 taken from a 1999 Maxima. Do I need to reprogram it at all? Because the installation just takes 10 minutes?

3) In case of need of reprogramming, is there anywhere else at all to go, other than the Nissan dealership. I know that the guy is trying to rip me off.

Thanks

 

UPDATE:

I sent the ECU back to JWT..I figure the light is coming on for some reason and its definetly not my car making it come on..the EVAP stuff was replaced by Nissan nearly 15K miles ago...I figured there is no way for me to fix the problem since its most likely not my car

I figured out why the ECU is not from my car. On my original ECU, the test screw was able to turn all the way around without resitance..the JWT i got in the mial, turned and stoped when its suppose to..unless JWT fixed that while it was there...

 

What is JWT anyway? Please lighten me up!

 

After reading this I am definately gonna carve some sort of seal or logo on mine so I know it is the same one I sent in.

 

A 4th gen ECU 96-99 should not need to be "flashed" or "reprogramed" at by a dealership before install. I know 99 ECU's are a bit different but they are still not the 5th gen type that can be reflashed. Sounds like they are trying to take you for a ride becasue I can't imagine that a Nissan dealership is that ignorant about their own cars.

If you indeed need a new ECU do this, get the number off your stock ECU and match it up to a used one on www.car-parts.com. You can usually get one for around $100. Install is really not that easy actually, but it can be done by even a novice.

With that said, running out of gas should not have effected your ECU. I have a feeling we are not getting the whole story becasue it just sounds way to odd.

 

After apology to Matty for using his thread, I have the same feeling. Either the first mechanic has done something wrong or the dealership is lying, which is more likely!

Thank you for the advice; ite really helped.

 

washed his name off with paint thinner? that's such f-ing BS. that's the most un-professional siht I ever heard in my life. those guys can reprog our ecu's but they can't come straight with an honest reply to matty, now, that's some major BS. why do they even try to lie like that? always treat us like idiots. I remember calling those f-er's up to talk about my current mods and future mods, and told them how I wanted to do my ECU. Those f-er's sent stonewall jackson on me and brick-walled my intensions. I don't know that much, but I do know enough to play. Those guys need to lower down their lazy-azz pride and start customer-servicing. If an else company can do rev limiter extension on a 5 speed ecu; I bet JWT will get their lazy-azz to work and start thinking for their customers. word...

 

i have a 95 ecu in my 97 and the only code i throw is the rear o2 code 0707. Im not sure if it runs in limp mode or not but i feel a difference with it. By the way i have a g-force ecu not the jwt but im just sharing my experience. I throw no other codes

 

my personal experience is a recent one. i mistakingly purchased a 95 tecnosquare cali spec ECU for my fed spec. they were both 5speed ecu's. it immediately threw an EVAP code. i think JWT switched your ECU with the opposite spec. because im throwing fuel temp sensor and EVAP canister purge control valve codes. hope that helps

 

Bull**** on the paint thinner. I can't believe they would even make something like that up. I marked my ECU before I sent it to them, and I got my ECU back with the markings on it.

 

was it markings in the metal or markings with a marker ???? if it was with a marker, im gonna bring that up to him on Monday

-matt

 

I say get your money back and run the Greddy Emanage Ultimate.

 

Well what is needed to run the Emanage Ultimate ?? after wireing it all up, what else will I need ??

It may be something I am thinking of

-matt

 

Just with a marker... I wasn't that concerned with it, not concerned enough to etch it in. The whole thing just sounds fishy to me, why would they purposely remove someone's identifying markings on their ECU. I can see just cleaning them, but obviously if someone puts their name and address or whatever on the ECU, they want to know they are getting theirs back... removing that info on purpose is a dckhead move basically. Fck that. That's retarded.

Also, paint thinner and electronics probably don't mix that well, and furthermore why the fck are they bothering to clean them anyways. Call them up and tell them instead of spending hours removing peoples identifying markings on their ECU, to get their gddamn act together and get people's ECUs back to them before the car oxidizes into a pile of rust. The more I think about this the more it pisses me off, not because I've got a personal stake in this, but because JWT wastes all this gddamn time making up excuses and giving out bullsht info rather than just doing their job and modifying the gddamn ECU and sending it back in a timely manner.

 

I sent an exact serial-number ECU match to my own ECU in to JWT. I even opened the ECU up and took pictures. I put an address label on the top and bottom covers. The letter enclosed stated I wanted this particular ECU back. There should have been no question this was mine and that I wanted it back. 10 weeks later and what do I get? An ECU with no stickers, no label, no serial. I don't doubt they did the paint thinner treatment to it. I get a damned EGRC solenoid code. I call JWT and ask them why I didn't get my own ECU upgraded. They ask me what makes me think it's not mine? (a shady question in and of itself) I tell them the pictures I took of the inside are different from the one I got back. Ben at JWT is hemming and hawing. Says he'll call me back (he never does). I call back and he tells me that the 1995 ecu was very early production and they couldn't modify it. I'm thinking ???. I tell him that is BS because it's the exact same ECU as my own and my build date was 5/95, one of the last MY1995 maxima made (he had assumed I bought just any ECU to send it for upgrading). Ben hems and haws again. Says he'll call me back (he never does). I call back and he says, that for whatever reason they just could not modify the ecu. I say, OK, what if I want my ECU back? He says they can't find it but when one comes along in the future (no timeframe), they'll can give it back to me if I wanted a refund (I would have to send the JWT ECU back now).

Bottom line: JWT is somewhat shady. If you want your ecu back, do whatever you must to make that known, ie. engraving/painting/labels/phone calls/etc. I will always wonder if I would have gotten a code if I had gotten my own ECU (modified) back.

 

alright, i have a better plan about this. as expensive as brian catt's stuff can run (cattman's prodcuts), I know cattman offers a line to send the ecu in for a JWT reprog. further, Brian can make sure you get yours back within two months or some period of timeline. Well, if we can pull some lines running the reprog from Brian Catts. Don't you guys think we can talk to Brian about this problem? At least Brian is more of a professional, so if he gets on the case, it would make it sound firm. Besides, it is about the same price running from Cattman's or straight from JWT. I've talked to Brian for a while, when it comes to business, he is very legit about everything. So running thru his line is most likely to make sure you get your own ecu back. (rather than us callin for empty help, JWT always think we're a bunch of ignorants, we'll let Brian handle this JWT's vaginal discharge)

How does that sound to ya'll?

 

I sent my ECU back to them and hopefully they will know more when they recieve it. I really dought they have mine still...I got this like early November of 04'...

Man the more I read the more and more I get pis*ed off...I will talking to JWT tomorrow about recieving my computer and I really hope they can come to some conclusion. If not, im gonna get it back, Greddy Emanage for the car, and sell the JWT...I cant stand a code

Cleaning off my name and address and year and model was truely pointless on their Point. No idea why they did that

 

I will be calling Brian tomorrow..I have a feeling he'll be able to help in this situation...JWT has my ECU so whatever they want to do, its in their hands

-matt

 

When I sent my I30 ECU into them for the NA tune a few years ago I got my same ECU back, I did mark it and specifically ask for mine in return but they probably did not have much of a choice since they most likley have none or very few I30 ECU's on hand.

 

you may not get anything back from brian catts that way. he is all about business. i know for sure if you paid through his deal to do the jwt, he'll be helping. but from what my xperience runs by talking to him, he sounded like no business, no talking...

good luck