What's the chances the my supposed P30 is actually a P28? I had the JDM harness on for a while and had the knock sensor hooked up. And I recently went back and installed my USDM DX harness and just wired up vtec. I didnt wire the knock sensor back in to the harness and just left it out. I expected a CEL, but haven't gotten one in 2 weeks of driving. If I were to remove the back cover to expose the circuit board, is there anything visible in there that would tell me which ECU it is?