Microsquirt Module v2.2m

[BryceK]

Hello all, I have a microsquirt module here that i am trying to find the cause of a burned trace to pin 31: serial gnd . The vehicle shut off while driving and had no start. pulled the ecu and only found the one burned trace on this module. So what does serial ground go to so that I can find the root cause of the failure? I found that the fuel pump relay was missing its plug and someone just put the pins in with out any insulator and I'm wondering if power touching ground here was the issue. This would be a short in the entire key on power circuit. here is a picture of the pinout with the highlight being the pin 31 that i see the burned trace on. thanks for any and all help.

[Matt Cramer]

Usually this is a sign of a ground offset between the ECU and your laptop.

[BryceK]

Uhhhh what? how do i fix this? I was also getting no communication to my laptop i should have mentioned that.

[BryceK]

looking at the board and following the circuit it seems to me that this does not go anywhere? could this be my communication problem?