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ECU over-voltage protection ... ?

Old 04-13-2019, 10:13 AM
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Default ECU over-voltage protection ... ?


In the passing years I noticed a few friends ECUs burning up in smoke because of over voltage (as far as I can tell), Haltech E8, DIYPNP, ME221.
The E8 and the ME221 burnt up while driving normally....

The DIYPNP died with a lot the other electric devices in the car (lose battery cables ?)

Bottom line is, How do I protect myself from over voltage ? or maybe other ECUs has over-voltage protection built in to them ?

I use MS3 Basic.

ME221 burnt:


btw I fixed the DIYPNP, on the microsquirt board and the main board too...
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Old 04-13-2019, 10:19 AM
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Install a voltmeter somewhere that you can see it, and if the voltage is too high then fix it?

In an NA the voltage is regulated internally inside the alternator, but in an NB it's managed by the ECU in software.

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Old 04-13-2019, 10:45 AM
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I want to protect the ecu and all the other car electric devices automatically from over-voltage - what can I use ?
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Old 04-13-2019, 01:24 PM
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If your ECU is a version 3.1+ (late 2014 onwards), then there are exactly ZERO voltage related failures on these ECUs, don't worry about it.
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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