here is the notorious big 8:

0803- Manifold absolute pressure sensor or circuit fault
1302- Manifold absolute pressure solenoid valve or circuit fault
0801- Vacuum cut bypass valve of circuit fault
0402- Fuel tank temperature sensor or circuit fault
1305- Fuel pump control module or circuit fault
0903- EVAP canister vent control valve circuit fault
1008- EVAP canister purge control valve circuit fault
0807- EVAP canister purge control valve solenoid

ok, this is the scenario:

i'm running a 95 max 5-speed with pretty much all the mods i can get for bolt ons. now i'm ready to do some engine work. i recently slapped on a mevi and a pathfinder throttlebody. runs fine and everything. but what good does it do without the ecu, right?

so i bought this 96 JWT ECU w/7200 rev limit. put that puppy on the car and it gives me the "EVAP 8" codes shown above.

i searched and a few of the orger's got these codes, too. but no one ever got around it. Now, after much debate and research, my observations are listed below:

1) Not all 4th gen maxima's have the same emission equipments. We all know that. At least I also know that there are the upper gen and the lower gen of the 95 5-speed models made:
upper gen=manufactured after 07/94
lower gen=manufactured before 07/94

the difference between the two are hardly distinguishable. The flywheels, for an example, are different. That's why some 95 5-speeds would have issues with the fidanza flywheels, which some distributors claimed perferct fitment for all 95-99 models. However, the lower gen 95 maxima will have fitment problems. I am a prime victim of such case. I had to buy a stillen flywheel to get-r-done.

2) EVAP system for a 95 is different than the 96-99's. i have 5 maxima's sittin at home right now, and from observing them, here is what I got:

a)96 auto (wrecked) electrical evap equipments
b)95 auto (running) canister evap equiments
c)96 auto (running) electrical evap equipped
d)97 auto (running) electrical evap equipped
e)95 5 speed (running) canister evap equipped

the electrical equipped evap would have more items to run the vacuum lines and such. the canister is located near the rear left tire.

the canister equipped evap has its canister sittin under the brake booster. it runs in conjunction with the solenoid purge control valve, and that's it.

3) ECU's on the 2 different evap setup is still compatiable, but will yield the codes, "the EVAP 8"
I'm not sure what the situation is with swapping ECU's between maxima's and I30's, but for ECU's programmed to run on these two different set of EVAP's, it sure will pull the 8 codes. one way or the other.

4) The codes "EVAP 8" doesn't seem to have much defects on the performance of the car. I still think the car runs as great as it has ever been. It's just that engine service soon light is bothering the psych out of me when i drive. After all, this really doesn't contribute to any power loss in my assumptions.

Now, with enough said, this topic hasn't been tinkered by anyone with firm results on the org. But does anyone know of a way to by-pass those codes from a electrical EVAP ECU to fit on the canister EVAP ECU?


(((((((Sorry moderator, I just posted this thread on the all motor section, but I think this is a very important topic to discuss. since not much people read up in the all motor section, i thought i post it here, too. if you are going to remove one, do remove that one in the all motors. thank you.))))))

 

Just a thought..>Did you try resetting the ECU over night, unplug the battary, or jsut reset with the screw and see if they all come back ??

-matt

 

yes, i did. reset, reset, reset, after reset. did all that. it still comes on.

it is very evident that we simply can't use an ecu that controls the electronic evap system into the ecu that controls the canister evap system.

after the reset, the codes dont' just come right back on. they come about 6 minutes later. this is always the case.

 

how do you know if you have electric or canister type ??

I sent my ECU to JWT and when they sent it back it was a different ECU...this better not throw codes

-matt

 

can the evap canisters be swapped?

 

Swapping ECU's that you sent in for another is a JWT norm. I have a feeling they work on the ecu's for a short time and do whatever they have on hand. When someone submits one, it's all up to what they have on hand and when they work on them as to whether you get your's back. They told me my 1995 ecu could not be modified because it was an early version. That is bunk. My car was one of the last MY1995 Maxima's made! I get a ghost code which they said they would fix in 6 months. That was 2 years ago... no fix. Hopefully you guys don't get codes but most likely if you do, they don't affect anything. Hopefully they won't illuminate the CEL because that would bug the hell out of me. My solitary code only comes up when you pull codes.

 

to find out if you got the electronic evap, you just got to go under the car in the rear left section. check for a rectangular canister. that's the electronic control type evap. the canister control evap doesn't route all the way to the back.

i'm pretty sure the evaps for both types can be swapped. it just takes a little work to figure out all the vacuum hose routings and such. the electronic evap is a little more complicated. so i won't think about swapping at the moment.

that sucks if jwt wouldn't give your "original" ecu back. that's just not cool at all. plus, they are a pain in the butt to deal with. they need to make changes in their services.

 

Yeah. I will always wonder if I get the code because of the different ecu. When I first got the ECU back, I actually called back to say I wanted my ECU back. They were like "uhhh, we can do that, but it may take a month or two. Won't be that one you sent us but one with the same serial." If they could not modify my ecu, what the hell did they do with it? I have a hunch they did modify it and sold it to someone else.