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When you have to run a wire for the knock sensor in your turbo project Galant GSX...you have 2 wires. One ground and one that plugs into #7(I think...but could be wrong) in the ECU harness.
The factory wiring from the sensor to the ECU is SHIELDED.
The factory ground goes from the sensor...connects to the shielding around the signal wire (side note...this is a cheesy connection...might have something to do with phantom knock at either end of the ground...)...all the way to the factory ECU...then connects to the ground where the ECU grounds to the chassis...NOT through the ECU in any way.
The signal wire goes straight to the ECU.
IF you run it just a normal wire to the ECU...and a ground straight to the Chassis at the engine...thinking...eh...it should work It won't. Your car will knock so loud you can hear it and you'll nearly wet yourself when you realize it isn't something rattling in your engine bay...its knock. But cause your "knock sensor" isn't reading anything bad...you think..nah...that can't be knock. Wrong.
I fixed the wiring now I have a knock sensor that works. Now comes the boost