Megasquirt Support Forum (MSEXTRA)

Board has been assembled for a couple of months but i finally just got around to running wires and installing it in my car. Tried to upload firmware but that was a no go due to error messages. Since this is my first big soldering job and first board i've ever assembled i started researching and found a thread that gave me a few places to check voltage so i did (readouts below). I took my time and really tried to be careful but i did have one part q20 that i had installed backwards and had trouble getting it back out so i'm hoping it didnt damage anything. The readouts are just the megasquirt hooked up to the harness in the car and ignition on... nothing else.

Battery Voltage 12.1v
S12 12.1v
Q9 12.1v
Q12 12.1v
Left leg D3 12.1v
Left leg D9 11.3v
Left leg U5 11.3v

5 volt readouts
S5 .1v
+5 protos .1v .1v
Right leg D9 5.1v
Left leg D19 .1v
Right leg U5 5.1v

Thanks for any and all help!

Remove the MS from the car, remove the MS2 daughterboard, connect only 12V and ground, and do the voltage checks at the mainboard 40-pin socket per the build manual.

As billr recommends, go to the Megamanual - Megasquirt / Boards / V3.00 / Build Guide. The build guide provides instruction on how to test the operation of the board at various stages of construction. Ultimately you may need a jimStim to test the board; but, that won't be of any use until you get the firmware loaded successfully.

Did you follow the procedure for downloading firmware as set out in the build guide? If the communication link is not working that will prevent you from downloading the firmware. The build guide includes a test for confirming that the communication link is working.

No, not the Megamanual! It is obsolete and has not been kept current or corrected. Use the manuals linked-to at the top of every page here.