Is this a rb25 s2 Ecu?

[camo240]

I've searched a bunch of sites and find part number lists but can't find one that says if its s1 or 2? The numbers are tk 23710 21U11 MEC-R531 A1 3X05 It has a spot on the side with holes for what looks like the led and check engine screw thing but its covered by a clear sticker that says MEC-R531 A1 6022. I think it is a auto Ecu. So my second question is can I use this on my manual? If so what do I have to do? I really appreciate the help I've been looking since 11:30pm till now 3:11am loosing my mind!!! Please help me out and thanks in advance for any help 👍

[Sileighty_85]

That is a R33 93-94 RB25DET A/T ECU

[camo240]

Sorry but does that mean its a s1 or s2? And does anyone know how to run a auto Ecu in a manual? Thanks.

[Sileighty_85]

welp if you searched R33 year productions you would see that the 93-94's are Zenki's which would make it a Series 1 ECU

AS far as using a Auto ECU on a Manual you just plug it in. Nothing else needed

[camo240]

Welp when i tried looking up what years s2 came in and found multiple posts saying so many different answers. Even that there is non neo s4's? The kid I got the Ecu from had this on a s2 so he says and he sent me a video of it running. But it wasent a close enough shot to see if I can get the signs of it being a s1 or s2. So I guess if anyone knows any way of telling by maybe looking inside the covers let me know please. I really hope I can be 100% its a s2

[camo240]

That is a R33 93-94 RB25DET A/T ECU

And my original question was is it s1 or s2. So sorry that I asked again but i just needed to know the answer.

[Sileighty_85]

Physically there is no difference between the S1/2 Engines the difference is the Coil packs,Wire Harness and ECU.

If you do not have a Z32 style ignitor chip above the #6 cylinder on the coil pack cover than its a Series 2 Wire harness, So as long as you have S2 coil pacs, Harness and ECU, then there shouldnt be any issues as long as the Harness was wired correctly

[camo240]

I know the differences between the motors I have a s2. By my question is how can I tell if its a s2 Ecu? Can I look inside of it for something? Bc the guy I got it off of was running it on a s2 motor or so he says. I just wanna be sure its the s2 so when I hook it up I don't fry nothing. Lol thanks

[camo240]

Does anyone have any way of knowing how to be sure the Ecu I have is s1 or s2 by looking inside of the Ecu or something I got it separate from my motor and was told its s2 but want to be sure

[camo240]

Bump it up please I need help

[Sileighty_85]

93-94's are Zenki's which would make it a Series 1 ECU

______________

[camo240]

Still looking for an answer on how to tell if this is a s2 Ecu. The numbers come back as posted above^^ I know that but my problem is that the kid I got it from said he had it running on his s2 with no problem and I even seen a video of it running with it. Some people say u can run s1 on a s2 but some people say u can't. So I want to make sure wich one I have by looking inside of it or something any tips incase the cover was mixed up or something like that??? Please any help would be great!!!

[Sileighty_85]

Jesus Christ man Ive told you three times its a fucking Zenki Which means its a SERIES 1 (ONE) ECU

If your Engine harness runs a Z32 Style Ignitor Chip then you have a SERIES 1 (ONE)
If Not then its a SERIES 2 (TWO).

If you are so damn worried about it then either locate and buy either the correct ECU or engine harness... its not rocket science

[camo240]

Idk what your problem is u can't read or something? U keep telling me this bc of the numbers on the damn cover. But I can take that cover off and put it on my rb20 Ecu and ur gonna tell me that's a fucking rb25 s1 also!! I'm asking if anyone else who can read the whole post and see that I have said I have a s2 motor that I know how to tell the differences between s1 and s2 motors and I know that the damn cover comes back as a s1 my question is how can I tell by looking inside the Ecu. Read my whole post before you reply if u start from the beginning and read everything I posted you only told me what I already knew. I wanted to find a way how to know for sure that it was s1 or s2 not just by reading a sticker on the cover. It was running on a s2 which a lot of people say can't work at all but alot of other people say they have done it and are still running a s1 on a s2. So unless u have any more info to give besides what I already know and what u have already copied and pasted that I already went over in original post then please don't post any more and let someone who can help me answer. ��

[Sileighty_85]

Who the fuck swaps ECU covers? I got 3 laying around and have no desire to do that for any reason.

why dont you try looking at ebay and see if company's open up the ECU when they are selling it...

Or are you worried that maybe those ppl swapped the covers as well.

Or just not be a vagina and plug it in and fire it up, worse case is the ECU fries and have to spend $50 for another Mystery ECU

[camo240]

Ok obviously you are a little slow. It wasn't done on purpose if it happened to get mixed up by accident I would never be able to tell. I looked at some pics but don't know what I'm looking for and can't seem to see a difference but in not that familiar with mother boards and stuff to catch it unless I know what I'm looking for.

I honestly never had some one waste so much of my time and keep going back and forth with stupid comments I said if you don't have any more useful info please stop posting. Everyone else on here has been very helpful when I had a question and always have helped me with no hassle and did the best the could to help. I think you belong on nicoclub or something where everyone just flames people bc they don't know as much a you think you do. Thanks for your input but once again please only post if you have helpful info that hasn't already covered thanks

[Sileighty_85]

Who takes apart multiple ECU's in the same area?
Dude if you have issues Identifying an ECU the you need to just sell you car and buy a Honda.

Really you are wasting my time cuz you dont know how to use Google properly, luckily im bored at work when dealing with you.

lol me on Nico you are confused that place is for ppl like you that ask questions that can be found by using Google.

Maybe you should do some research and see how much I actually do know about this stuff?

[DJ 21o3]

Wow Camo, no one else is answering because the question was already answered...3 times! I read your original post like you told him to do. In your original question, you asked someone to identify it based on the numbers which he did. He then answered if it was a series 1 like you asked. He then said you could use it with a manual like you asked. You then asked the same question which he answered again...

So to answer your question:
93-94's are Zenki's which would make it a Series 1 ECU



If you are really that worried, buy another ECU or go aftermarket.

[camo240]

And I said thank you for what he told me it verified what I could find on google and zilvia search but if u read down I came across the problem where I was told by a few people that you can't use a s1 on a s2 motor. Some say it don't matter bc igniter is in the coils or before the coils like a s1 and the Ecu does the same job. Just maf plug is different bc of a different map. But I know the kid I got it from has a s2 and he's sent me a video of the car running. But he's in Cali and I'm in pa. So I'm just taking his word it was the same Ecu in the video. So therefore when talking to someone else about it they mentioned maybe the cover was mixed up and comes back to a s1 but its a s2 inside. It's possible. People make mistakes idk where or what happened to the Ecu before I got it...

That's y I posted again and asked if anyone knows how to tell by looking inside or any other way so I can be positive. If its a s2 I'm set but if its a s1 ill sell it for a s2. And I'm not just gonna sell it to someone and say oh here's a s2 and have them have trouble with it. And make me a bad guy.

It's a very simple question and if this means I has to be flamed and told the same damn info over and over until someone finally knows the answer or happens to have a s1 and s2 Ecu laying around that they can look for me then so be it. And as far as doing research to see what you really know I wouldn't waste my time looking at your posts or anything I don't care after u posted the same comment again after I asked if there was any other way to know for sure and then u opened your mouth an were an ass to me and obv not understanding the question I got a good idea what u know and that's how to be stubborn and just try and keep pissy comments going back and forth instead of helping me. If u don't have any helpful info then please don't post

If you don't have helpful info please don't post
If you want to piss and whine please go on face book or something
Thanks for the previous help but I need to know how to be sure I have a s2 Ecu
Not that it's stupid the cover could have been swapped
I just want to know how I can tell by looking inside if its s1 or s2

So please either help me or move on to another post if you don't know thanks for looking if you happen to have any tips or advice on who will know for sure or anything please let me know. Thanks

[camo240]

Still looking for an answer on how to tell if this is a s2 Ecu. The numbers come back as posted above^^ I know that but my problem is that the kid I got it from said he had it running on his s2 with no problem and I even seen a video of it running with it. Some people say u can run s1 on a s2 but some people say u can't. So I want to make sure wich one I have by looking inside of it or something any tips incase the cover was mixed up or something like that??? Please any help would be great!!!



Right here is what I need to know. I understand what the numbers come back as but I'm confused on the s1 Ecu running a s2 motor. The kid had a s2 motor and this Ecu. I don't know if the Ecu cover is the wrong one so I need help on how to look inside and find a way to be 100% sure my motor isint in yet to just plug it in and idk anyone local with a rb25 just my buddy with a rb20 and another kid with my old rb20. Thanks for the help guys

[DJ 21o3]

I would just plug it in and fire her up. If it doesn't run, sell it. As long as everything is setup right, the ECU shouldn't be at risk for damage. It just won't run the engine right.

[ridesnowx4]

If you need a Series 2 RB25 ecu I will have one available soon.

[PrimeDirective]

camo240 it is painful to read this post. Everyone looks at the labels on their ecu to tell which car its for. Lets just make it plain and simple for you, since you're paranoid and can not figure it out on your own.

You have a series 1 ecu. You have a series 2 engine. It will not work on your engine. Get the right ecu. Though you'll probably have to order one from the dealership because who knows who else is out there swaping covers!

[camo240]

Well primedirective I'm so glad u were able to push through the pain and and be able to post and say dumb shit thanks. And since ur saying it won't work on a s1 u just show even more reason why I new an answer. Bc this was running a s2. Even tho it says its a s1 on the cover lmfao that's why I want someone who has both or knows about the boards inside better.

I found a guy on Instagram who has a shop and he threw another curve ball at me by saying maybe the kid had s2 coils swapped onto his s1 so he thinks the motor is a s2 its so annoying bc I don't want to sell this Ecu to someone and call it a s1 and have them stuck if its really a s2. My swap isint in the car yet or I would try and run it. Idk y everyone is being such a$$ holes when I'm stuck in a shity spot and am just trying to learn something new. It's not like I'm asking how to find my spark plugs or if I can make a Honda vtec cam work lol

So since no one can answer me with helpful info I might just delete this post and retitle it or post in pic request and maybe someone will happen to know there. Bc even if I was handed a s2 Ecu today for free I would still like to know what makes them different on the board inside just bc its something that I want to know. I've always wanted to know how things work and learn as much as I can. I love my rbs and s13s ill never get out of drifting that's why I use this forum to learn what I don't know from people who do. And I never had any trouble before. Most of the time people either tell me what I'm looking for or tell me what they think to the best of their knowledge. That's all I can ask for.

And ridesnowx4 hit me up when ur getting rid of it and with a price incase I can't figure this out ill just have to hold onto it and buy yours

[camo240]

I would just plug it in and fire her up. If it doesn't run, sell it. As long as everything is setup right, the ECU shouldn't be at risk for damage. It just won't run the engine right.

Thanks for not being a dick!! Lol and I would but right now we have 2 fc turbo 2 swaps going on and in between doing them we have a rb20 s13 getting frame rails patched and doing other odds and ends and a ka 240thats being a pain I'm the ass to bleed the coolant and find a vacuum leak on. So my swap is put off for now plus I need a driveshaft and maf still. I just was hoping that someone would know like maybe a guy who tunes them would throw me some info but rb25 ecus don't get tuned often bc everyone goes standalone.

[DJ 21o3]

Bc this was running a s2.

:smash:

we were trying to help so no need to insult everyone when they did their best to answer. If it ran a S2, then it has to be a S2.

Post a picture, ask for someone to post a pic of theirs. success. not trying to be a dick at all, but i even searched out of my own curiosity and gave myself a headache. pictures just work better. lol

[camo240]

Can anyone else verify that you can't run a s1 on a s2 motor? Bc I searched it and depending on what link you click on its a different answer. A guy in Philly pa has a r33 1 and a r34 s2 said he switched his before for a reason I can't remember and he said it still runs fine. But other people say it won't start. I'm tempted to believe it will run bc the igniter is built onto the coils or the igniter on the s1. I do know the mafs are different and have a different tune to some degree but should still run the car right? Thanks for the help!! Really this is such a pain in the ass unless some one has already done it.