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Sanity Check: MSLabs MS3 Basic Fused Output Pin1

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Sanity Check: MSLabs MS3 Basic Fused Output Pin1

 
Old 07-07-2018, 05:01 PM
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Default Sanity Check: MSLabs MS3 Basic Fused Output Pin1

Brand new MS3 Basic from MSLabs, purchased from TSE.
Followed all install steps provided, successfully. Now adding power/ground/analog signal for MTX-L.
Pin 1: Fused 12v Out (6A)
Pin 2: Device ground
Pin 4: Analog input

MTX-L face comes up as normal with no sensor attached. Went to calibrate in open air for the first time, and it went ER9 (insufficient voltage) and went blank. Battery/voltage is fine.

Tested Pin 1 output, no voltage.
Opened MS3 case. Only fuse I can find is a small glass tube type. 500ma. Not 6A. But, it does appear to fuse the output for Pin 1 according to a glance at the board traces. It doesn't visibly look toasty, but does not pass a continuity test. It's blown.

Questions:
Have I identified the appropriate fuse for the 12v+ wideband output?
If so, why the heck is it a 500ma?
If it was erroneous, I'm assuming I can go find a 5-6a tube style fuse and replace?

Thanks in advance.
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Old 07-07-2018, 05:54 PM
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Edit: Disregard my post, I didn't realize MS3 Basics have 12V outputs for widebands
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Old 07-07-2018, 05:57 PM
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Pretty sure the 500mA fuse is for 5vref
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Old 07-07-2018, 07:09 PM
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Sourced a replacement 500ma fuse, so I've got my MTX-L display back (no sensor).

Don't want to replace with correct? 6A fuse until I can confirm I've got the facts straight. Again, I can't find another fuse elsewhere on either board.

I'll write Andrew/TSE as well.
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Old 07-08-2018, 03:40 AM
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The fuse should be a 6A, not a 500mA one. Please post a picture of the fuse. We don't have 500mA fuses as there's nothing we would use them for, so I don't see how this could have happened. The only way I can think of, is if a 500mA fuse was put in the 6A lot from the factory. I just checked all our fuse stock and there is no 500mA fuse in there.

tldr; put a 6A fuse, not a 500mA fuse.
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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 07-08-2018, 08:37 AM
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Thanks for confirming. Here's what came out of it:

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Old 07-08-2018, 09:12 AM
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These are the only two fuses we have ever used, both are 6A. Thanks for bringing this to our attention, we'll need to be a little more cautious in the future.
Attached Thumbnails Sanity Check: MSLabs MS3 Basic Fused Output Pin1-20180708_160753.jpg  
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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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