Hey everyone,

Currently going through the final steps of building my diypnp v1.5. I have an AEM X series wideband that I want to wire up through the DB15 port on the diypnp. DIYautotune says to use an SG (signal ground) pin for the wideband's signal ground, the only issue is that both SG pins are being used by the connector board (following the diypnp 1990-1993 miata pin out guide). Just wondering what others have done in this case, I'm assuming wiring the wideband's signal ground to a power GND is a big no no since it'll introduce unwanted noise.

 

Splice it into the other sensor grounds.

 

All the grounds on the megasquirt are sensor grounds, there's no internal distinction between the two.

The important thing is the order of the grounds. All sensors should hit the megasquirt ground before the the chassis ground. Get that wrong and then you'll see ground offsets.

 

Duh haha, I will do that!