Hello i was doing some on-bench testing earlier and i accidently reversed the polarity into the megasquirt for about a minute and i seem to have cooked something. Is there a protection for this? If not how much stuff will need replacing?
Thanks.
Reversed polarity into Megasquirt II V3.
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Bernard Fife
- Master Squirter
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Re: Reversed polarity into Megasquirt II V3.
ts,
In theory, D9, D12, and D19 will all be flowing a lot of current if the polarity is accidentally reversed. They will burn out eventually though, and it's hard to say what would go next (though I recall that others that have done this may have had to replace the LED transistors Q6, Q7, and Q8 as well as possibly the fuel pump transistor Q19).
If this was mine, I would pull-up one leg of each of the three diodes (D9, D12, D19), and then test with a stim (and a power supply that won't fry anything on its own) to see if you are getting 5V at the voltage regulator, and if you have any communications with the processor.
Lance.
In theory, D9, D12, and D19 will all be flowing a lot of current if the polarity is accidentally reversed. They will burn out eventually though, and it's hard to say what would go next (though I recall that others that have done this may have had to replace the LED transistors Q6, Q7, and Q8 as well as possibly the fuel pump transistor Q19).
If this was mine, I would pull-up one leg of each of the three diodes (D9, D12, D19), and then test with a stim (and a power supply that won't fry anything on its own) to see if you are getting 5V at the voltage regulator, and if you have any communications with the processor.
Lance.
"Never wrestle with pigs. You both get dirty and the pig likes it.” - George Bernard Shaw