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Old 11-10-2015, 01:35 AM   #1
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Default Used Megasquirt 2 and harness testing

I picked up a used ms2 with a harness. The harness looks a little sketchy and a few wires are not hooked up to any pins. It came out of a running but I'd like to test it before plugging it in.
I plan to check all the wiring against the instructions. What's the worst that can happen if I plug it into my car as is?
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Old 11-10-2015, 09:43 AM   #2
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What's the worst that can happen if I plug it into my car as is?
It can blow up?
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Old 11-10-2015, 09:58 AM   #3
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The car or the MS?
The MS looks well put together and has the jumpers and mods for a 1.6. I just have concerns about the harness. I just need to find a good this wire goes to this pin diagram. I found some for 1.8 motors but I'm not sure the are the same.
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Old 11-10-2015, 10:01 AM   #4
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Old 11-10-2015, 10:13 AM   #5
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Thanks, time to break out the reading glasses and soldering iron.
I want to fire up this MS so bad and getting it talking to Aeryn (the Miata )
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Old 11-10-2015, 10:15 AM   #6
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Oh I just saw that's for a MS3, it's the same for MS2?
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Old 11-10-2015, 10:23 AM   #7
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Yeah, you need to remove the wiring harness from you car and install Mazda's MS3 harness...
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Old 11-10-2015, 12:07 PM   #8
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I'm on it , will start ripping out soon, pics to follow....
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Old 11-10-2015, 12:16 PM   #9
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I'm starting with this
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Used Megasquirt 2 and harness testing-photo4294966678.jpg  
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Old 11-10-2015, 12:17 PM   #10
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But if things so badly I might give this a shot:
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Old 11-10-2015, 12:25 PM   #11
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But if things so badly I might give this a shot:
why would you do that to yourself?



the MS requires it to be opened up so you know how it was built. Or the loaded tune needs to be looked at in the least.

the dangling wires could be anything, the pink is the O2 input for one. The others could be EBC out or a handful of other input/output wires that the builder chose to access. youd have to trace where they are going back to the DB37 connector, then see what circuit they go to on the ECU itself.

one does not simply install and turn-key a custom built ECU without any knowledge/knowhow.
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Old 11-10-2015, 01:10 PM   #12
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Yes, I have a problem with patients, but I'm working on it. I took the tape off and it's a pretty messy job with bent pins and heat shrink that might have been done with a candle.
I think I'll de-solder, trim back and do it all pretty like.
In the meantime I think I need a MS Stim to test and load a base tune pre turbo.
I did take the cover off, it's a version 3 pcb with the ms2 daughter board.

Oh an the Link ECU control will be for sale soon
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Old 11-10-2015, 01:12 PM   #13
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Used Megasquirt 2 and harness testing-photo4294966967.jpg
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Old 11-10-2015, 01:40 PM   #14
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That's a one scary harness.

one wrong move and youll short out the computer and blow up the car in a raging fire.


looks like whoever built it already caught it on fire using his iron to shrink the insulation -- foreshadowing.
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Old 11-10-2015, 07:02 PM   #15
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Inside the jumpers look different than the ones you have on the sticky
Used Megasquirt 2 and harness testing-photo14.jpgUsed Megasquirt 2 and harness testing-photo84.jpg
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Old 11-10-2015, 07:03 PM   #16
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Used Megasquirt 2 and harness testing-photo621.jpg
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Old 11-13-2015, 04:19 AM   #17
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Finished cleaning up the harness.
Checked wiring, some show tps blue wire connected some don't. Also found a spot for O2 purple wire. This leave fuel pump and one other wire unconnected.
Attachment 154807Attachment 154806
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Old 11-13-2015, 10:48 AM   #18
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Here's a shot of it
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Old 11-13-2015, 11:23 AM   #19
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I'd trim all those leads shorter to make sure they cant accidentally touch if bent somehow. also insulate them (i use hot glue) so you cant short them out on the chassis once installed.

internal mods look fine.


it makes me agnry you used that disgustingly awful diagram and not mine.
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Old 11-13-2015, 12:20 PM   #20
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Thanks. I do plan to insulate the rest. I haven't even shrunk the heat shrink yet. I just wanted to make sure it all was connected right then I will fill it will some silicone.
I'm waiting for my Stim and IAT to arrive from diymegasquirt so I can bench test and load a basic tune for my non-turbo engine.
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