SR20 ECU only sending 3.3v to Knock Sensor?

[cbh148]

Yes I did, and the FSM is wrong about testing the knock sensor for resistance. EricTheCarGuy proved that in his video working on a Subaru (which uses the same knock sensor which requires 5v reference signal unplugged and 2.5v signal plugged in with no knocking). He showed how the FSM incorrectly instructs to test resistance when actually they need to be tested for voltage, because even his brand new knock sensor was "failing" the FSM's test for resistance. The manufacturer of the knock sensor told him the proper way to test them.

And by checking my ECU's reference signal to the knock sensor (as in, when the knock sensor is unplugged) I am following what the FSM says should be there, just of course finding 3.3v instead of 5.0v. And still no idea why.

Martin at RS-Enthalpy says it's pointless to even measure the knock sensor voltage because its something that a "normal" multimeter can't read. I just don't know enough about it.