did a search on how to do a cel code check in a 1990 civic HB running a p28. All i found was that you have to jump a pin to the ground but they weren't sure which pin. dose anyone know which pin and can I ground it to anything.thanks in advance.

running a d16z6 , p28 ecu and a frog wiring harness

 

the "pin" or wire that you need to ground is d4 (it's the plug on the right side, top row 2nd slot from the left)

 

thanks

 

no problem