ok here's the deal i got a megasquirt with the t2 i bought it isn't wired in.The previous owner said he had it wired up and it was running but took it out because of some other electrical problem the car had,which he found and just never wired it back in.it is a ms2 v2.2 and the chip inside says v3.0 so i don't know what this means.He did do the lm1825(i think thats what its called ) and said it just needs to be wired up but i've got no instructions on how to wire this thing up and the only diagram i find is for the v3.i just need a diagram so i can wire it in. hopefully i can get this thing going,the runs its running of the stock ecu for now.but the guy i got it from doesn't return calls so i'am asking my fellow rx'ers for help. Thanks hopefully you guys can help

 

The FAQ shows you the wiring for the ignition inputs on the V2 board and the outputs on the V3 board. The outputs (pullup resistors) are the same on the V2 as on the V3.

 

Aaron you are a megasquirt guru but i have not a clue what that means i just wanted a diagram like i got with my safc some thing tha shows me what wire goes where.i know you a re willing to help anyone but i really don't understand all those crazy scematics.i just need a good diagram to wire this thing in so i can have someone tune it

 

If you can't understand basic schematics, then STOP right now and find someone with some electronics knowledge.

While the Megasquirt is a great ECU, the learning curve is very steep and if you don't have some electronics knowledge, you're going to have a lot of problems. Unlike just soldering harness wires together, modding the Megasquirt requires some skill and will end up in a mess otherwise.

As far as I know, no actual picture of all the connections exist because it's far too complex to represent that way.

 

I wouldnt say that. I had little or no experience with electronics or soldering pc boards etc.....but I managed to assemble my MS2 and wire it into my car and it all worked first time . It just takes a little reading and some common sense. Here is the diagram, it may look confusing at first but its actually quite simple.
Go through it and then tell me which parts you dont understand and ill help you out.

 

ok this is what i am trying to do ,i'm trying take the diytune harness and tap it into the stock harness.the megasquirt is already built ,the harness is from diytune which is labeled and doesn't match the v3.0 wiring that have.i just need to know how to go about finding out what wires to tap into and get this done. i also got a safc but that won't support the 1600cc injectors i have for my car.i just need to find out what to tap into so i can get this going

 

Get a service manual for your car (Proper Electrical Schematics), take the wiring information of the forum and MS site and hand the car and information to some one that can do wiring. By your questions and discriptions I think you may be over your head on this. I,m not an expert but I do understand electrical and schematics.
Best Regards

 

Don't use the stock harness. It's junk and 20+ years old. The wiring is corroded, most of the connectors are probably bad, and you're going to have grounding issues. One of the nicest things about a standalone is that you start with a fresh wiring harness.

The DIY AutoTune harness is exactly what you need for any version of the 'Squirt. It matches the wiring diagram perfectly. What you will need to do is add the shielded cable for the 2nd reluctor input, and then use the IAC wires as your ignition outputs. In addition you'll need to actually build that 2nd reluctor circuit.

 

Check the ground wires on the DIY harness. I've heard of a few of the connections simply falling apart. I had to redo mine for this reson.

 

ok is the wiring diagram the same for the v2 and if not where can i find it i think i just figuered it out diytune has the pin out for the harness on their web site so i'm trying to match them up

 

The wire diagram can be found at www.megasquirt.info. Most wires are the same for V2.2 and V3. You will also need to look at the stock wireing diagram to find any wires that you still need to keep, around page 50-22 is what you need to look at. As well, in one of the sub folders with megatune you will find the additional schematics for the ignition wireing which will need to be done.

As others have said, if you don't understand don't understand the schematics than you will have a tough time with this. It can be done, but it will be a steep learning curve.

 

ok finally i got the right schematics.i was confused because the v3 wiring did not match my diy-tune harness for the v2. ok so let me get this right i have a ms v2.2 with the two vr conditioners lm1825 already made,in which i need to find the cas positive and neg on my harness which i can find on the faq. as far as the stock harness i ve to tap into its brand new and its easier that way for me this way i don't have to figure out relays and just use the stock ones. if any of this is wrong let me know

 

Take a photo or two of what you have and post them here so we can tell you what you have.

 

I would have to agree with Aaron here. It is much easier to use the new MS harness rather than using the old one. and it looks soooo pretty compared to the factory mess.

 

ok here are the pics of it. i'm thinking of just using the stock sensors and using the megasquirt harness. let me know if its the right setup and if its put together right

 

You have a Megasquirt 1 on a V2.2 board with the daughter card attached. It looks like the mod to run the BAC valve has been done already, and you have the dual 4bar MAP sensor so you can run insane boost (on race fuel) and do constant barometric correction.

You will want to follow the V2.2 wireing for everything except the Tach signal, which you should follow the pictures for rotary. In case you have not seen them, I will attach them at the bottom. As well you will have to follow the spark outputs for rotary which I will also attach at the bottom. These pictures are included in the additional hardware folder with megatune.

If you don't understand these then you should find someone who does. Don't guess and hope your right, that could cause a problem down the road that would be hard to figues out.

Good luck

 

ok i understand it now i'll follow the first pic as far as wiring in the ignition using my pins. as far as the second pic do i need to use this because my vr conditioner is wired to the megasquirt

 

You'll need to follow it to hook your CAS wires up to the megasquirt properly. That picture is very good in that it even tells you which colour wire to hook up where. You should also make sure the PO hooked up the daughter card according to that diagram.

 

cool i got i'm going to order the diy tune relay board already assembeled so i loose the stock harness

 

Why? Even when you loose the stock harness there are still all the relays and such that you need available.

You can get it if you want but in the end it will probably make more work for yourself. You need to look through the Wireing diagram of the FSM and be sure you understand what wires need to go where on the megasquirt.

 

ok the diy relay board comes withe the relays for the injectors,fuel,and other stuff including the fuses. aaron told me to use the diy harness because the stock one was crap

 

Yes, the DIY harness plugs directly into the Megasquirt ECU. The relay board is really only needed when you are converting a Carb engine to EFI. Otherwise everything you need is already in the car, and you would have to either re-wire EVERYTHING or you will be running everything through 2 relays rather than just one. The Stock engine harness is crap. A number of the things you need to use don't run off that harness, like the main power, fuel pump, coil's, and probably others that i'm forgetting right now too. There are also parts of the engine harness you will want to keep, ie. the windshield wipers. As everyone has been saying, there is a little more to it than unplugging one thing and plugging the other in.

 

ok what i'm going to do since i got a week of is take the harness out little by little so i can see what i do need and what i don't.my stock harness must of got f up some how because its sutting down one set of coils at idle until about 3,000 rpms it kicks it back on. i got to put the squirt in before my engine blows.but thanks for your help you are a wise person and have some insite on this squirt thing