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  1. #1

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    MS2 V3.57 issues

    Does anyone know of a clear wiring diagram and settings instructions for a ms2 running v 3.57 on an obd1 car? I have a turbo build going and all I can find is conflicting information everywhere I look. Very little info on the 3.57 from what I can find.

  2. #2
    HNIC SC2Sick's Avatar
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    Sixthsphere.com Owner
    2016 Honda Fit
    2003 BMW e46
    2001 Saturn SC2 - Forged with everything but boost - FOR SALE PM FOR MORE INFO
    1998 Ford Ranger

  3. #3

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    Recently got mine started, but has not been on the road yet.

    GM DIS Pinout
    6pin connector:
    A) 12v power (pink), needs to be hot in run & crank. Use 7.5 amp fuse.
    B) 6X ref (white) -- unused, might drive a tach output?
    C) EST wire (WHITE) -- used for Timing Advance signal. Wired to D14/SparkA.
    D) Reference High (Purple w/white tracer) -- Tach input to MS
    E) unused
    F) EST Bypass wire (Tan w/black tracer) -- when 5v is applied, module will use timing signal from MS on pin C. When no signal, timing should be in limp-home 10* BTDC. I have this wired to D16 via SPR3.

    5pin connector:
    A) Positive crank sensor wire (yellow) -- goes to crank position sensor
    B) Negative crank sensor wire (purple) -- goes to crank position sensor
    C) not used
    D) Reference low (red w/black tracer -- Goes to MS sensor ground
    E) High current ground. Ground to the block.

    Used with Basic Trigger ignition setting, with a 10 degree trigger angle, it seems to work pretty good.

    -Dave

  4. #4

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    Thanks for the reply. I finally got it going and took it to buttonwillow this weekend. Didn't have much time for photos but the 24hrs of lemons Facebook page and website will have plenty of photos. Blew a head gasket after about 5hrs of running due to a cooling issue. Car runs solid! I'll replace the head gasket with a Cometic and throw some forged pistons in there and I think it's a solid setup on 8lbs of Boost.

  5. #5

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    Quote Originally Posted by Tiresmoker View Post
    Recently got mine started, but has not been on the road yet.

    GM DIS Pinout
    6pin connector:
    A) 12v power (pink), needs to be hot in run & crank. Use 7.5 amp fuse.
    B) 6X ref (white) -- unused, might drive a tach output?
    C) EST wire (WHITE) -- used for Timing Advance signal. Wired to D14/SparkA.
    D) Reference High (Purple w/white tracer) -- Tach input to MS
    E) unused
    F) EST Bypass wire (Tan w/black tracer) -- when 5v is applied, module will use timing signal from MS on pin C. When no signal, timing should be in limp-home 10* BTDC. I have this wired to D16 via SPR3.

    5pin connector:
    A) Positive crank sensor wire (yellow) -- goes to crank position sensor
    B) Negative crank sensor wire (purple) -- goes to crank position sensor
    C) not used
    D) Reference low (red w/black tracer -- Goes to MS sensor ground
    E) High current ground. Ground to the block.

    Used with Basic Trigger ignition setting, with a 10 degree trigger angle, it seems to work pretty good.

    -Dave
    So obvious question maybe not. Dave are you using optical input or VR input . Is your vr- going to sensor ground? Or ground straight to obd1 icm?

    Sent from my Moto G (4) using Tapatalk

  6. #6

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    Quote Originally Posted by leighv View Post
    So obvious question maybe not. Dave are you using optical input or VR input . Is your vr- going to sensor ground? Or ground straight to obd1 icm?

    Sent from my Moto G (4) using Tapatalk
    The VR input circuit. That's the preferred circuit for MS in general anymore. I'm using the OBD-1 ICM, so both VR+ and VR- are going to the ICM, on the 5pin connector. Tach signal to the MS comes from the 6pin connector.

    -Dave

  7. #7

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    I'm running Microsquirt so they have separate opto in and VR in, thats why i was asking. right now i got it wired like yours but i was using opto in since i thought the ICM convert to hall signal. i will try VR in. i was getting crank signal but it was sporadic and brief...

  8. #8

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    and also by vr- i meant on the megasquirt side, not the vr in on the icm

  9. #9

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    There is so little accurate information to see someone running it successfully i need to pick your brain like a vulture. especially since theres no info other than mainstream megasquirt (microsquirt is technically the same but it seems theres some differences in wiring)

  10. #10
    Approved Vendor ZombieSatty's Avatar
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    It's so easy they said, just MS it they s said.

    And people wonder why ive kept mine stocker for so long.
    It's not my fault, blame the radiation.

  11. #11

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    LOL yea.. i had to make the attempt though. otherwise i'd be stuck with a stock ECU with no way to tune. i can still run stock ECU as i left the OEM harness in place. igot the fuel side right, i just cant for the life of me get a good tach signal and theres so little documentation on GM 7X. there's so many little details left assumed by documentation. ahhhh

  12. #12

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    Yeah, I'd try the VR input. You're right, the ICM does output a hall-type signal, but I think they've found over time, at least with the regular non-Microsquirt units, that the VR circuit works better. I don't know electronics and circuitry enough to know why, though.

    -Dave

  13. #13

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    does the VR input ground from your microsquirt go to a sensor ground or does it ground to the ICM?

  14. #14

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    I dunno, it's not that hard. Did my homework on the ICM wiring, then I made my own harness. I made my own so in case something wasn't right, I could plug the stock stuff back in with minimal effort. Is it tedious? Yeah, a little. But if you can solder & shrink wrap, you can do it.

    I started with the 10' MS1/MS2/MS3 harness from DIYAutotune.com ($80), snipped the sensor/ICM connectors from the junkyard, bought an injector harness off ebay ($20) for some other engine to save a little effort, soldered everything together, and it runs. I wired this all up on a parts-car as a proof-of-concept before I transfer it into our Chumpcar endurance racer. Granted, I've only run it in the garage and moved it around in the driveway because the trans has a couple holes in it. But the engine sounds 'normal' and smooth. I've been running MS for years on a small-block Chevy, so I have some experience, but this stuff isn't rocket science either.

    If anyone has questions, I'll try to help out as best I can.

    -Dave

  15. #15

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    Quote Originally Posted by leighv View Post
    does the VR input ground from your microsquirt go to a sensor ground or does it ground to the ICM?
    I'm running regular MS2/Extra on a 3.57 board. I have mine wired with the VR sensor going to the ICM, just like the factory OBD-1 wiring. The 5-pin connector has two ground wires-- one to the engine, one to MS sensor ground. See the pinout I listed above.

    -Dave

  16. #16

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    Yea i was hoping to save $$ and complexity with Microsquirt vs megasquirt (i dont need the extra features nor do i desire to deal with the vague instructions) but it doesnt seem to be the case

    I might try what Alex is doing in another thread and run the OBDII module to fire the coils and OBDI to clean the tach signal. functioning as a cheap and tough filter for the signal.

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