Attention, ALL boards use ‘going low’ !!!! DO NOT USE ‘going high’!!
For some reason, a lot of people set the ecu wrongly to going high. Even DIYAutotune says to use ‘going low’ in their instructions. So AGAIN. Use GOING LOW!!
v3 Boards (red color for NB and white color for NA)
v2 Boards (green color for both NA and NB)
Using the mainboard spark outputs.
This megasquirt uses the MS3X spark outputs. Should you have made the mistake of setting the spark outputs to ‘going high’ instead of ‘going low’, chances are that you burnt your coils. You could also have burnt the spark output transistors or worse, the processor outputs!
Should you have burnt the processor outputs, rest assured, there is a 2nd set of spark outputs that you can use.
Desolder the left leg of resistors R18 (spark A) and R23 (spark B) and lift them from the board. The solder points are no longer being used. Both resistors are now deconnected from the processor. Make sure the legs of the resistors does not thouch the pcb.
We are now going to connect both resistors to 2 different pins on the processor. We will use the pins for the knock module. If you have fitted the knock module, you must remove it unfortunately.
Run a wire from the left leg of R18 to the top solder hole of the knock module. Run a 2nd wire from R23 to the 2nd solder hole of the knock module. Use some heat shrink tube over R23 and R18 to make sure they do not thouch the original solder points.
Since the resistors are only hanging on the board with 1 leg now, use some hot glue to keep the resistor in place. Also use some hot glue to stick the wires to the board.
In TunerStudio, set the spark outputs to ‘main board’ instead of MS3X.