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I/O not working - MS3 Basic

 
Old 07-14-2018, 04:57 PM
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Default I/O not working - MS3 Basic

Hey guys it's been a while...

I'm currently building an Exocet from my 96 Turbo miata. I'm having issues with the I/O on my MS3 Basic. I've successfully run my MS3 Basic for a few years, but the exocet did require me to rebuild my harness.

I'm currently setting up the following I/O

input- datalog***************MS3 Datalog- AC Idle up input on stock harness - Switch to Ground
input- tableswitch***********MS3 Tableswitch- Grey- Pin 14 on DB37 - Switch to Ground
output- boost****************MS3 EBC Out- Dark Green- Pin 20 on DB37 - Low side output -
Output- VICS****************MS3 INJ F- AC Compresssor output on stock harness - Low side output -
Output- Warning LED******MS3 IAC1- Light Green- Pin 18 on DB37 - Low side output
Output- datalog LED ******MS3 INJ G- AC Fan output on stock harness blu/grn pin1a - Low side output

None of the pins changed from my old setup, and the tune did not change, and yet I cant get any of them to work..even in test mode. Other I/O outputs work such as my Fans, CEL, & Canbus wideband. All factory IO like injectors, spark, fuel pump, TPS, all work - Engine runs fine.... I'm scratching my head because I literally had no other wiring issues with my harness. Is it possible I burned something up internally?

Any help is much appreciated!

-Dave
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Old 07-15-2018, 03:44 AM
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All these inputs and outputs come from separate points, including different ribbon cables and have different ground routes on the board etc. So I don't see how they can all fail at the same time. For the outputs, check that your devices do have 12V, and that the ground that you use for the inputs is ok.
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
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Old 07-15-2018, 07:26 AM
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That’s good news I suppose. I’ll start debugging the harness. I checked the outputs in test mode with a multimeter checking continuity to ground with no success so that would take tune setup and 12v supply out of the equation.
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Old 07-15-2018, 10:36 AM
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You can't check the outputs by testing for continuity to the ground, it doesn't work that way.
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
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Old 07-15-2018, 10:38 AM
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Inputs (generally speaking) frequently need pull-ups.

check voltages.
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Old 07-15-2018, 02:00 PM
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Slight update -

input- tableswitch - Retested and it works fine
output- boost - Tested in test mode with LED - Works fine
Output- Warning LED - Had a mistake in wiring polarity - Now it's working fine

So the only things that aren't working are the ones that tie into the stock harness plug rather than the DB37. Time to dig in & track each wire down.
input- datalog***************MS3 Datalog- AC Idle up input on stock harness - Switch to Ground
Output- VICS****************MS3 INJ F- AC Compresssor output on stock harness - Low side output -
Output- datalog LED ******MS3 INJ G- AC Fan output on stock harness blu/grn pin1a - Low side output
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Old 07-15-2018, 04:47 PM
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Originally Posted by 240_to_miata View Post
Slight update -

input- tableswitch - Retested and it works fine
output- boost - Tested in test mode with LED - Works fine
Output- Warning LED - Had a mistake in wiring polarity - Now it's working fine

So the only things that aren't working are the ones that tie into the stock harness plug rather than the DB37. Time to dig in & track each wire down.
input- datalog***************MS3 Datalog- AC Idle up input on stock harness - Switch to Ground
Output- VICS****************MS3 INJ F- AC Compresssor output on stock harness - Low side output -
Output- datalog LED ******MS3 INJ G- AC Fan output on stock harness blu/grn pin1a - Low side output
Update again.... Wiring Wiring Wiring.

Found a few mistakes. Only thing that isn't working now is VICs - Which seems to be wired properly to pin 1G, INJ F, AC Compressor Output.

I may just move the output to the DB37 and see if I can get it going.
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