Knock Sensor Voltage

[gttwinturbo]

Does anybody know what voltage toyota knock sensors output normally (when knocking/detonation is not occuring). I've heard that its a 0-5v sensor that averages about 2.5v but im not sure if that's true or not, if you know or have any theories please speak up!

[wilbo666]

Not much, but some Toyota specific info.

38 Sensors#8 - Knock Sensors with questions.pdf file size 55KB

Cheers
Wilbo

[gttwinturbo]

cheers that helps me understand how knock sensors work a bit better. I just need to know what voltage or voltage range they output so I can bypass it.

[OnAll-FOUR]

Bypass it?

[oldcorollas]

piezo output is usually filtered such that only vltage spikes associated with knock make it thru the filter, and trigger a signal in the ECU (afaik?)

so during normal running there is no signal...
i am not sure if the ECU checks for resistance/impedance/whatver of the sensor to see if it is still there or not, but a good start would be to disconnect it and see what happens
or, connect knock sensor and not connect it to the engine.... (may possibly need to earth the casing?)

[amichie]

http://www.toymods.org.au/forums/sho...e+knock+sensor