Megasquirt Doesn't Function

[bakes007]

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,

[Matt Cramer]

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

[bakes007]

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.

[bakes007]

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?

[trakkies]

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.

[bakes007]

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

[trakkies]

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.