Official DIY ECU EPROM programming discussion

Post by **fraz** » Thu Jul 21, 2005 12:06 am

hey datsunboy, i have a couple of z32 maf's lying round here. I pay roughly 39 NZ$ (20$ US) at pick a part in auckland. They are rare, but you can find them on vg30de j30 maximas, but only on the j30 model, the other real common model maxima (also vg30) has the same maf as the rb20de/det

Post by **datsunboy** » Fri Jul 22, 2005 3:24 am

awesome....too bad I can't find one in chch. are you willing to sell me one of your spare Z32 MAF's?

Post by **nab911** » Fri Jul 22, 2005 4:31 am

If shipping to New Zealand isnt bad (customs and what not) im going to a junkyard tommarow that has 2-3 and im getting the plugs so i could get an extra and ship it to you. Will be around $150 shipped.

Post by **c-rad** » Fri Jul 22, 2005 4:59 am

nab911 wrote:If shipping to New Zealand isnt bad (customs and what not) im going to a junkyard tommarow that has 2-3 and im getting the plugs so i could get an extra and ship it to you. Will be around $150 shipped.

It costs $9 to ship a Z32 MAF to New Zealand USPS Global Priority Mail (4-6 business days).

Post by **nab911** » Fri Jul 22, 2005 10:36 am

Well if yall want one, let me know by tommarow morning, $150 shipped.

Post by **datsunboy** » Fri Jul 22, 2005 3:32 pm

cheers man, but I'll pass for now, and see if either fraz or my mate who said he may be able to get me one cheap first.cheers for the offer tho!

Post by **fraz** » Fri Jul 22, 2005 4:50 pm

hey datsunboy, just had a hunt round, i only have n60 maf's left.sold both n62's last week. ill keep an eye out for you if you want

Post by **datsunboy** » Sat Jul 23, 2005 12:41 am

sweet as I already have a N60 MAF.....would be good if ya could keep an eye out!give me an email if you find anything..... [email protected]!

Post by **nab911** » Sat Jul 23, 2005 7:21 am

Ok, i need to know the difference in the numbers. I picked up 2 n62's today off of 93ish j30's. They both look great and they came off vg30de motors. So i have an extra one if anyone needs it. Up for trades too.

Post by **datsunboy** » Sat Jul 23, 2005 1:11 pm

haha.....I got a N60 MAF and a set of factory 370cc injectors and a set of factory coil packs for trade?lol

Post by **nab911** » Mon Jul 25, 2005 5:32 am

lol well actualy there was a lot of interest. But i think i just found a new hobby so i may be getting some more soon.

Post by **nab911** » Mon Jul 25, 2005 12:07 pm

Well i burned the chip... got the maf... got it all hooked up and it wont even crank anymore. I think one of the ecu wires came apart but im not real sure. I turned it on, could the hear the fuel pump but it never stopped going... like the sound of it priming never stopped and it didnt sound like it was igniting... Im gonna go home, check that wire, then check the plugs to make sure they arnt fowled.

Post by **datsunboy** » Mon Jul 25, 2005 5:18 pm

same thing with the fuel pump happened to me once......I think it was just the blue ECU connector wasn't bolted in properly....it's gotta be up quite tight.I've had a few probs tho....another time, I fired a ECU....think the fuel pump didn't go at all.and the other time was when I switched ECU's, and forgot that the one I put in the car didn't have a chip in it lol.......think the fuel pump stayed on then too......

So check your connector, the Chip is inserted properly, the right way around, and that your socket is all soldered up good.

if it's none of that, then maybe it's a wiring problem, or somehow you didn't write the chip properly?

Post by **Not_a_sr** » Mon Jul 25, 2005 7:44 pm

did you put the chip in the right direction.

also did you plug in the smaller harness clip, i have left that unplugged a few times and it wouldnt start.

make sure the chip is in correctly should have a little notch on one side on both the socket and the chip.

Post by **Dattebayo** » Tue Jul 26, 2005 5:53 am

Hey datsunboy, what do you want for the factory injectors?

Email me at [email protected]

Edit: I have a question about a rom tuned for emissions:I am worried about when I have to pass emissions next year. I know that a turbo CA in my S13 will not pass without some help, so is it safe and possible to get a rom tuned simply for passing emissions? Would it have to be done specifically to my engine or could anyone just burn up one and mail it off to me? Thanks, didnt mean to clutter th thread up if its a dumb question...
Modified by 2BN_S13 at 12:10 PM 7/26/2005

Post by **nab911** » Tue Jul 26, 2005 7:11 am

The chips could be dependent on the specific motor but its more of a general ca18 thing until you get it on a dyno with a wideband and tune actualy fuel map and ignition points.

As for putting the chip in right... i have no clue at all. There was no notch on either one so ill have to pull it back out and take a look at it. Whats with this clip thing? I Just pressed the plug in and bolted till it was tight.

Post by **biosehnsucht** » Tue Jul 26, 2005 7:45 am

he may be referring to the daughterboard that sits above the ROM that you have to remove to get at the ROM.

Post by **nab911** » Tue Jul 26, 2005 8:30 am

? i put the duaghterboard back and screwed it in, but that should have affected anything because the ribbon cable going to it was hardwired not, not slid into a slot.

Post by **datsunboy** » Tue Jul 26, 2005 1:12 pm

"2BN_S13".....first of all, I live in New Zealand....so you sure it wont cost too much to send over?I don't want a whole lot for them, so just make me an offer.2 of them have the little pintle caps missing ( just a small plastic cap for the end ), but I think these only cost a couple of $ each at the injector recondition shop, and you can clip them on yourself.

the notch end of the chip will be the end that is furtherest away from the SIDE wall of the ECU. ( also the end of the chip closet to the ribbon cable ) If you look at it....there is a white line on the ECU PCB that shows the semi-circular notch at this end. the socket you have installed should also have this same notch in the same position ( although the socket will work in either direction, it will just confuse you if it's backwards. ). that notch, once again should line up with the notch on the chip itself.

I have NEVER seen a chip that doesn't have this notch before....it's only small, so look good.

also make sure you have good soldered connections, that go THROUGH the PCB.....as the ECU has a double sided PCB and the solder neeeds to go through the holes to the other side to ensure that all the connections are good.

Post by **nab911** » Wed Jul 27, 2005 12:37 pm

I had a TV repair guy do it and he mentioned that he had to solder both the bottom and top because it was double sided. Im not worried about the socket but the chip may be backwards, and it could not be seated to well.

Post by **c-rad** » Wed Jul 27, 2005 1:03 pm

Which eprom chip did you use? 27C128 or 27C256?

Post by **nab911** » Thu Jul 28, 2005 2:59 am

Post by **Dattebayo** » Thu Jul 28, 2005 3:42 pm

I was under the impression that CA's were only compatible with the 27C128 chips...

I mean, we only have 8-bit computers. What I read from the bikirom site made it look like you use the 256 chip for KA and SR computers using a daughterboard or something like that.

Post by **c-rad** » Thu Jul 28, 2005 3:56 pm

nab911 wrote:256

Did you write the file to the chip twice? If you use the 256, you have to do that. The same file must be on there twice in order for the ECU to use it.

Post by **biosehnsucht** » Thu Jul 28, 2005 3:58 pm

as long as you put the same rom in each bank of 128k it should in theory work with 128,256, and 512 chips. beyond that the pin assignments get incompatible..

Post by **Dattebayo** » Thu Jul 28, 2005 4:50 pm

what about having a multi-selector for different maps? How could that setup be fabricated? Was this discussed earlier in the thread?

Post by **c-rad** » Thu Jul 28, 2005 5:01 pm

2BN_S13 wrote:what about having a multi-selector for different maps? How could that setup be fabricated? Was this discussed earlier in the thread?

I've heard of running 2 maps by either applying or removing 5v to one of the pins, but I have NO idea what the technical details of that are.

Post by **biosehnsucht** » Thu Jul 28, 2005 5:53 pm

in order to use a multibank setup, using the extra addess pins, instead of connecting into the socket or soldering to the board, bend them up away from the board and solder wires to them leading to your selector switch(es)

for two banks on 256k chips, you would bend pin 27 (A14) up and solder a wire to it leading to the switch, which would connect that wire to either 5V or 0V, preferably drawn from someplace on the ECU itself. grounded (off) is bank 0, connected to 5V (on) is bank 1

for four banks on 512 chips, you would use both pin 27 (A14) and pin 1 (A15), each going through a three position switch (you could use a 2 position dip switch where each position is connected to either ground or 5V).both switches grounded (off) would be bank 0, A14=on and A15=off is bank 1, A14=off and A15=on is bank 2, and A14=on and A15=on is bank 3.

(or 1-4 instead of 0-3 but thats how I normally think of things)

to make a bin file to burn you can do something like the following at a DOS/command prompt:

copy /b bank0.bin+bank1.bin+bank2.bin+bank3.bin rom.bin

for 256k you'd just have bank0+bank1; then burn the rom.bin to chip.for unused rom bank positions, you can just reuse others i.e. you could use 0+1+2+0 to use 3 and have something valid in the other 'unused' bank so you don't have really bad things happen if you accidentally switch it to that.

if using just one rom image on an oversized rom, use the above copy method but copy the same rom image however many times for example image+image+image+image for a 512 chip or image+image for a 256 chip.

Post by **Dattebayo** » Thu Jul 28, 2005 6:08 pm

and how do we know how to find the number associated with each pin?

Post by **biosehnsucht** » Thu Jul 28, 2005 6:25 pm

I listed the pins and their combinations for standard 27c256/27c512 and compatible pinout chips, which includes most 28cXXX and some 29cXXX variations.

Note that if you don't use switches that have 3 pins (middle common that goes to the rom, the other two going to 5V and gnd respectively) you'll have to do some electrical trickery to pull up or down the voltage when its left floating (on 2 pin switches), which I won't go into at the moment..

Official DIY ECU EPROM programming discussion

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