Ok so I just want to make sure I understand this. My car doesn't have the diagnostic checker to jump right now. ODB1 P72ecu

1. So what I've researched is that I can ground d4 correct?

2. If that is correct does this just mean I can splice into the wire coming out of d4 and just ground it some place in the car then turn the key?

 

Anyone done this?

 

Just thought I would bring this back one more time. Going to get the car into the garage within the next few days to try and figure out the CEL.