hey whats up, i own a 90 Z32 N/A.
i'm replacing my fuel injectors and want to resset my ecu after i'm finished, how is this done? i've searched around but couldn't find anything.
is it just unhooking the battery for a certian period of time..
or is there ore to it?

thanks

 

Reset it for what? Why would you need to reset the ecu?

 

i was told that if the car has been running shity for a while the ecu will remap to run as good as it can in the condition its in, and whe you fix the problem you need to resset the ecu. now this is what i was told by a master technician from nissan. weather or no this is the case.. i dont know.
but better safe then sorry.
do you know how?

 

sometimes disconnecting the battery for a while will help. i'm not sure if that does any re-setting or anything though.

 

Ah... you didn't say it was running bad in your first post.

Have you checked the Z32 FAQ's / Gen Info page? https://www.zdriver.com/forums/300zx-z32-tech-tips-273/general-z32-info-8434/

And by doing a quick ZDriver / Google search: https://www.zdriver.com/forums/350z-z33-forums-6/anyone-really-know-8838/

 

You can't "resset" something that was never "sset" in the first place.




If it was once set, you would want to reset it.


Disconnect the battery for about 15 minutes.

 

so if i disconnect the battery for 15 mins, and pump the brakes to drain any remaining power. this will set the ecu?
then i wont have to do anything else???

 

why would pumping the brakes do anything if the battery is disconnected? whats even wrong with the car other than the injectors? does it run like *** or something? throwing codes? check engine light? just get the new injectors installed then disconnect the batter for 15 minutes (go get lunch) then start it and hope for the best.

 

Drain the power? WTF???

 

It is clear to me that you have no electrical background. As such, I'm going to have to recommend that you take your car to a shop.

 

So your telling me that pumping the brakes doesn't reset the ECU?!?!??! Dammit, my uncle kliedis was wrong after all. lol

 

haha. you said kliedis.

 

I'm guessing he meant pressing the brakes to discharge any remaining electricity through his brake lights.

However, I do not believe that would do anything to the small moment of electricity left in his ECU....

Then again, that's why they say wait 15 minutes...

So kid, just do as they say, don't add on "should I also turn on my windshield wipers while standing on one leg and touching my nose?"

 

Since I feel like being very clear and thorough right now, I'll explain why it was a dumb question.

Voltage is pressure. If you remove a battery while the car is not running, you remove the voltage (pressure) source. If there's no voltage (pressure) pushing electrons through the system (current), then there's no power (power is a flow of electrons), thus the brake lights couldn't even flicker. The ECU does have the ability to maintain some power for a short while (same technology as most modern aftermarket car stereos and boost controllers), but it is seperate from the rest of the elctrical system (not connected in any way to your brake lights). Leave the battery disconnected long enough and this charge will dissipate, thus clearing the ECU's memory.

 

interesting lesson about voltage. i've been trying to get educated on the topic of electicity. maybe we'll touch on it in mech. eng. school!

 

unless you have a capacitor or another method of storing the energy from the battery when the circuit was complete. but obviously a Z wouldnt have that.

 

Capacitors are only good for real short bursts of electricity - that's what makes them different from batteries. The very large ones used in car stereo systems are simply to prevent dimming of the dash and headlights during hard bass thumps that drain a lot of system energy for only a split second. So, yes, if you had a very large capacitor on the electrical system, disconnected the battery and stepped on the brakes, they'd flash and then go out. But I don't know of any car that has a setup like that other than in the stereo (and I can't think of any practical use for it either).