MSefi.com read only forum (Jan.15,2018)

Hey guys,

I have a megasquirt v3.0 board running 2.89 code. I'm am running it on a yamaha R6 fuel injected motor. Everything was working fine and all of a sudden the serial connection went dead and all three LED's flash simultaneously. Has anyone had this issue before? Is this some kind of error code or critical error?

Thanks much,

First thing to check - is the problem something that only happens on the bike, or can you duplicate it on a Stimulator?

I did check that previously, it happens on the stim board as well. No serial connection and all leds on stim board and megasquirt flash simultaneously.

Ok, so after reading the assembly guide I looked at the power supply circuit. In the guide it says to check the pins on U5. Between 1&2 and 1 &3 it's open loop. when I say pin 1 I mean the pin closest to the serial port. However, between pins 2 and 3 I have 1.2k ohms of resistance. Is this value high enough or should it be open loop like the other two? If it's not high enough, has my board turned into a brick?

U5 is simply a 5 volt regulator. If it is producing 5 volts it's ok. You can check the 5 volts on the proto area - it's marked.

Right, but I'm talking about the board's internal power circuit. Did this accidently get shorted out causing my main issue?

There are effectively two power rails - the 12v and 5 volt one. The 12 volt basically just has some filtering, etc. The 5 volt one should survive a short as U5 has protection against this internally.