JimStim 1.5 had a short on 5V - anything broken?

Building and using the Stimulator to test your Megasquirt

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JimStim 1.5 had a short on 5V - anything broken?

Postby David_G » Sat Feb 04, 2017 1:40 am

Hi,

I used the 5V and ground-pins on the JimStim for supplying a (3 wire) pressure sensor which I wanted to test.
Unfortunately I had to find out the sensor must be broken because I measured 5V on the ground wire when the sensor was only connected to the 5V line. Wish I had measured that before connecting it to the JimStim!
So thats how I created a short between 5V and ground on the JimStim.

The LEDs went out immediately and I switched off the JimStim after that.
Now after disconnecting the faulty sensor, everything seems to work fine again, but I am still unsure if there is anything that had been destroyed by the short or not.

Is the JimStim/Megasquirt fused against a 5V short?
What is most commonly broken after a 5V short?

Thanks, David

PS.:
Is it normal that the Injector LEDs do not switch off at exactly the same time when hitting the rev limiter which is set to fuel cut only?
I dont have the progressive fuel cut option activated, so to my understanding they should have to switch off at exactly the same time, right?
Here's a video of it: https://www.youtube.com/watch?v=Z5g-Fax0Qv8
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Re: JimStim 1.5 had a short on 5V - anything broken?

Postby DaveEFI » Sat Feb 04, 2017 1:58 am

Voltage regulators pretty well all have short circuit protection built into them.
Rover SD1 3.5 EFI
MS2 V3
EDIS
Tech Edge O2
London UK.
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Re: JimStim 1.5 had a short on 5V - anything broken?

Postby David_G » Sat Feb 04, 2017 5:41 am

Very nice, Thanks a lot!

Any input on the fuel cut behaviour? Is that a normal behaviour?
I tested my MS3x often before but I can't remember if it was the same as it is now.
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