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Old 09-04-2016, 10:01 AM   #21
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Quote:
Originally Posted by Braineack View Post
The MS has mechanical over-voltage protection (MOV1) that will shut it down if there's voltage spikes--IIRC it clamps at 18V.
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Originally Posted by nile13 View Post
Strange, though, that when voltage spikes the Tuner Studio disconnects with that kind of message, no?
Why is that so strange? Overvoltage protection shuts MS down, TunerStudio loses connection and gets confused.
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Old 09-04-2016, 06:02 PM   #22
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Why is that so strange? Overvoltage protection shuts MS down, TunerStudio loses connection and gets confused.
Waaait a second. I overlooked the word "Mechanical". So, is there a relay of some sort inside the MS that shuts it down? If so, that certainly explains all the clicking I'm hearing. If not, what's the shutdown mechanism?
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Old 09-06-2016, 01:32 PM   #23
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It's not a relay, but it also is not anything you can adjust or tune: https://en.wikipedia.org/wiki/Varistor
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Old 09-06-2016, 10:10 PM   #24
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Thanks, Matt (brings back my EE education from 25 years ago ). I heard clicking and thought it was coming from MS, so was assuming some sort of a relay. It could have been fuel pump relay clicking, I assume, depending on what MS was telling it to do as it was shutting down from overvoltage. I don't think there's anything else nearby there under NB dash?
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Old 09-07-2016, 10:11 AM   #25
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the clicking is the fuel pump relay turning off when the MS shuts down.
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Old 09-10-2016, 11:45 PM   #26
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After replacing what looked like a little iffy R3, the MS2 still appears pretty dead with the same symptoms - it now doesn't really connect to Tunerstudio and complains about mismatch in project. Interestingly, with the key in the on position today I heard some faint whirring noise under the dash (??). Also, was actually able to have a relay click on and off by moving the harness a bit. Re-rang the harness again, looked at DB37 connectors, don't see anything obviously loose or cold-soldered.

So, is there anyone or any service that can test this MS2 and fix it? The car had to run on stock ECU today and, of course, was on the limiter a bunch of times at autocross. I'm willing to pay someone, of course, to do this, but have no idea who to turn to. Please help.
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