I just unpligged the battery I was putting an amp in i only had it unplugged for 10 min...i go to drive the car to test the sound system and that stupid ECU is back to learn mode again!! I did a 0-60 clock with it like this you wont believe the result: 26.7 seconds. AS FAST AS I COULD GET IT TO ACCELERATE. I hate it when its like this. I just ordered a MAF sensor so hopefully i will feel A BIG difference after i install it.

 

0 - 60 in 26.7 seconds?

That car shouldn't be on the road, 18 wheelers accellerate faster then that.

 

How long a relearn and what kind of driving did you do before you did the "0 - 60 run"? You have a known MAF issue as well?

 

i drove it about 20 miles before i did that run. last time i unplugged it it took 250-300 miles to fully back to normal....yes i am 90% sure i have a MAF problem thats why i ordered one. hopefully it'll be here ASAP i hate the car like this

 

I'm fixing to install my system in my car. I guess this will happen to me as well? How do you know the ECU is back to learn mode? And is there anything you have to do, just drive it as normal as possible or what? Aggggg......thats the only thing I don't like about reading these forums.... scare the chit out of me. lol At least I know ahead of time what is coming though.

 

you got a civic, since when?

 

Yeah 0 -60 in 26.7 seconds is a bit too long.

 

For the home mechanic disconnecting and reconnecting the battery can result in performance issues usually first noticed as an unstable/abnormal idle (even stall), and particularly if the car is driven hard prematurely (which is a no, no) before the relearn is completed. This is poorly explained in your owners manual under "Ready for inspection/maintenance test" but the procedure for the "relearn" is there. Notice the statement "ordinary usage". This is why the "relearn" can take quite awhile. If you read the requirements in the "readiness" procedure it could take quite a while to meet all the requirements of the procedure by "ordinary" driving if you didn't actually know them (or accomplish the stated procedure). The dealers of course have the Consult ll scan tool to accomplish a "quick learn", which at minimum will set the idle. Hopefully this may explain why, if you disconnect and reconnect the battery for any reason don't suddenly assume that you have a problem. The relearn can take awhile.

 

P., so what you are saying is unless I don't want to shell out no telling how much $$$$, there is nothing I can do but deal with the poor running and try to drive it as normal as I can, and not try overdriving it. How long before the reset or is it automatic when the battery is disconnected?

 

mine does a 0-60 is 6.9 secs

 

that's salt on an open wound...not cool.

 

The car will relean after you have driven for 3 times for a good distance. I'm not sure how far. It will go away soon.

 

I had the same issue's recently. Disconnected the battery and my car ran like s%^t. Do a search and find the sequence learning for gas pedal, ecu relearn and idle air volume. I know it's here somewhere I don't have the option to do a search. I found the papers in the car and relearned these parameters and the car ran great again. I had my timing bumped up to 17 degrees and the car ran great till I disconnected the battery. I thought I lost this setting because just like you the car ran great and then after the fact like hell. I started chasing the problem and all you have to do is find theses relearn settings and your car will be back to normal. The relearn is something along the lines of; turn key to on position for 3sec pump gas pedal 5 times within 5 sec's; so on and so on. Hope this helps

 

found this on another forum, guess I'll use this one when I do my system unless someone else finds another one:

Warm up engine.
-Turn ignition switch “OFF” and wait at least 10 seconds.
-Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.
-Repeat the following procedure quickly five times within 5 seconds.
a. Fully depress the accelerator pedal.
b. Fully release the accelerator pedal.
-Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL stops
blinking and turned ON.
-Fully release the accelerator pedal within 3 seconds after the MIL goes ON.
-Start engine and let it idle.
-Wait 20 seconds.

 

Thats it. There are three different ones posted for 2k2.

 

I had my battery disconnected for well over an hour while I installed my intake, and the MAF was totally disconnected during that time. When I hooked it all back up, the car was fine. My trip odometer and my radio presets were all gone, but the car definitely didn't take almost 30 seconds to reach 60mph.

This didn't just happen because your battery was disconnected for 10 mins.

 

i disconnect my battery all the time, and the only thing that ever happens is that my tripometer and radio presets are all reset....you should have a car thats slower than a freakin civic just from unplugging your battery for a while

 

So this procedure works for reseting the 00-01' ecu's also?

 

Unplugged my battery once for 1.5 hours to install my intake... and then 3 hours for my y-pipe... and then once 24 hours for the heck of it (cuz I was gullible and believed the ECU reset myth)... never had any of the problems mentioned....

 

When I installed my intake, i never unplugged the battery. Which i think affected my MAF. If u've changed ur maf, should the battery be unplugged during? Will a Nissan ECU reprogram fix this if it happens?

 

After reading all these threads.. i'm a little "iffy" about disconnecting my battery at anytime :-/

is there an actual safe way of unplugging the battery?

 

yeah unplug the NEGITIVE terminal, to the battery.. dont unplug the positive side. once you reconnect the negitive side the car should run PERFECTLY WITHOUT CODES.. yall are doing somthing wrong

 

i ahve unplugged my car several times, without having this problem arise. good luck with it!

 

I disconnected my battery when I went on vacation for a month..came back..everything was back to normal except the radio resets...

 

Which terminal did you disconnect? Did you have ANY relearn at all?

 

it doesnt matter which terminal you disconnect first. breaking the cricuit is the same either way.


ive had the battery out of both of mine for a couple hours. my blue 1 went 3 months with a dead as a door battery with no ill effects.

neither 1 showed any poor running symptoms at all.

 

So then the only reason ECU's "relearn" is when there is some other problem, such as with the MAF?

 

nope, your car has a throttle cable, not throttle by wire, so if you try that all you will do is flood the engine.

 

My auto 4th gen goes 0-60 in 6.67 sseconds. Thats why im better than all of you. :-)

 

whoa holy crap minus the guy with the vr-4

 

not me, i got the best of both worlds.

 

Good to know .

 

reset it again and for a bit longer, then give it a few drives. dont bother punchin it 0-60

 

Disconnected mine once for several hours and noticed zero change in driving when I plugged it back in. Maybe I'm numbed, senses-wise, but it definitely wasn't taking 26 seconds to reach 60.