What The Hell

can someone here write a proper HOW to use eprom or eeprom, what the hell is that, how does it work in stupid terms not terms used by all you compu geniouses.
i was trying to figure it out and i was just like "what the hell are they talking about"

thanks guys
Bess

Well, if you think of your ECU like your PC ...

If the ECU uses an EPROM chip, that means all the tables (what the ECU uses for all its functions) can be erased, and rewritten.

If your ECU does not have an EPROM chip, you're stuck. If it does, you could "flash" the EPROM, which deletes the information. Then when you reload the code onto the EPROM

So if your ECU was programmed for 270cc injectors, in the "look up table" for fuel, there is a number in there that represents the injectors.

So the ECU does the math for you. It takes your MAF reading, calculates that against the "table" and decides how much fuel to send the motor.

So let's say your MAF signal is 4.0 volts
The ECU takes that information, compares it to the "look up table"

On the "lookup table" is all the information. Nissan would program all that. So the ECU knows that at 4v MAF signal, with 270cc injectors, it needs to send a signal of "X" to the injectors.

With an EPROM reader/writer, you can go in, find that information, and change the injector value (270cc) to whatever you put in. The ECU will then be able to fuel even a monster.

Anyone know of a good eprom reader/writer? I might try my hand at it with a spare ecu I've got laying around.

Well, if you think of your ECU like your PC ...

If the ECU uses an EPROM chip, that means all the tables (what the ECU uses for all its functions) can be erased, and rewritten.

If your ECU does not have an EPROM chip, you're stuck. If it does, you could "flash" the EPROM, which deletes the information. Then when you reload the code onto the EPROM

So if your ECU was programmed for 270cc injectors, in the "look up table" for fuel, there is a number in there that represents the injectors.

So the ECU does the math for you. It takes your MAF reading, calculates that against the "table" and decides how much fuel to send the motor.

So let's say your MAF signal is 4.0 volts
The ECU takes that information, compares it to the "look up table"

On the "lookup table" is all the information. Nissan would program all that. So the ECU knows that at 4v MAF signal, with 270cc injectors, it needs to send a signal of "X" to the injectors.

With an EPROM reader/writer, you can go in, find that information, and change the injector value (270cc) to whatever you put in. The ECU will then be able to fuel even a monster.

matt i will buy the shit, 50 bucks for programming is it cool with you?
what the hell man i know shit about comps

a few problems

1) I don't know for sure the S12 has an EPROM chip

2) If it does, I still don't know what code it's written in

3) I don't have a reader or writer

But Spooled, I did find a cheap one online, let me dig it up again

a few problems

1) I don't know for sure the S12 has an EPROM chip

2) If it does, I still don't know what code it's written in

3) I don't have a reader or writer

But Spooled, I did find a cheap one online, let me dig it up again

1) get me a picture of the ECU out of the case, I will tell you
2) assembly, but must be dis-assembled from rough hex to start looking at different op codes and the programming structure. This is where it gets hard. Our best bet will be to dump the code and see if there are similarities to an already dis-assembled code. If there is not, good luck boys, there just isn't enough time in the day for me to be perfectly honest.
3) there are several out there on the net, just google boys, or froogle if you are looking to buy.

or booble if you ... well, that's pretty self explanatory

can someone here write a proper HOW to use eprom or eeprom, what the hell is that, how does it work in stupid terms not terms used by all you compu geniouses.
i was trying to figure it out and i was just like "what the hell are they talking about"

thanks guys
BessAre you looking to re-program the ECU for the CA18DET, becuase I think those have been cracked...

yeah ca18DET
it uses c256 eprom shit
yeah matt i am buying the reader/burner or whatever the hell they are
i find it cool to build your own chip at the comfort of your living home

the M27C256 IS the ecu chip ( well it is the EPROM....electronically reprogramable Read only memory )
it is the chip that stores all the fuel/ign maps e.t.c..
you need to buy the M27C256 ( or a M27C128 is the factory chip...but quite hard to get nowadays....and the 256 one works just the same )
then get it "programmed" ( data written to it ).
unsolder the factory EPROM chip, solder in a 28 pin IC socket so that you can pull your new EPROM in and out faster for ease of prgramming.

I'd suggest that you get someone else to do this for you if you are having trouble understanding how it works

what that means i have no clue i just see reprogram and i can kinda understand

the M27C256 IS the ecu chip ( well it is the EPROM....electronically reprogramable Read only memory )
to put it in computer terms thats basically like a CD that spins really fast.
it is the chip that stores all the fuel/ign maps e.t.c..
you need to buy the M27C256 ( or a M27C128 is the factory chip...but quite hard to get nowadays....and the 256 one works just the same )
The stock ECU's chip size is 128 bits, which is hard to come by these days. The 256 chip works fine, you either put the good data in the first 128 and just put "FF" in the last half or make a double program to fill the chip.
then get it "programmed" ( data written to it ).
that one is pretty self-explanitory
unsolder the factory EPROM chip, solder in a 28 pin IC socket so that you can pull your new EPROM in and out faster for ease of prgramming.
This is actually the first step in my book. Desoldering can be a PITA if you do not have the right tools.
I'd suggest that you get someone else to do this for you if you are having trouble understanding how it works
I think this sentence applys to you if you are posting this thread.

eprom work isn't that bad. as i've said time and time again the problem is after we get the chip off the board trying to disassemble the code from hex back into assembly. The rest of it is very easy if you know what your doing and have done your homework.

again, if you have any questions, just google. I am willing to bet you can find the information you're looking for.

If the car already has the eprom cracked, and you don't understand things to this point, I would suggest not fooling with the eprom. Either that or just dump some code that someone has already tested and forget about it. I am sure someone has hosted some code out there that you could grab. Once again, search.

i have searched man
thanks for the good info though
the thing is that i just don't get the hole language thing
ok a chip holds the data that the ecu can read
how do you upload that data into the chip?
it's just that
i am reading too much and this thing isn't going into my head
too much terminology i can't understand
oh well i guess reading more and asking some compu ppl's like you even the most of the idiots would learn a 1%
thanks guys