looking at the ecu from the plug side, with the release tabs on the top, you'll have the center plug ( the smallest) and to the right the 22 pin plug (2 rows of 11 pins). on the 22 pin port the bottom row, 2nd pin in from the left side. this is the wire that is labeled check engine light on my jkobd harness that I used in my crx when I did the obd1 conversion. I was using a p28 but the p30 pinout should be the same with the knock sensor being the only added wires.