Hello all!

My girlfriends car has the P0325 code present. Replaced sensor and still has code. Cleared code obd live data on knock sensor at startup reads .02 to .04 volts and spiked to 1 v a few times. Voltage bleeds down then goes to zero and throws code.
Checked continuity between first connect in front of engine to the pigtail that attaches to the sensor and it is fine. Grabbed an original junkyard honda sensor and retested and it did the same.

Need help on where to test the wiring back to the ecu. Is there a fuse or relay in this circuit. Not that experienced with this repair or car. I read there Is a shielded wire for ground and a signal wire. How to I test both. I assume the ecu is center dash and enters the engine bay to a connector. What is the path of the signal wire to the sensor? Thank you!