The AUSubaru.com.au Forums

Hi guys,

What sort of signal is given by the knock sensor....? Is it a constant voltage? How does the signal change when it senses a ping?

Can I trick the ECU into thinking there is a knock sensor connected....(I know its not advised etc, just need the info)

Thanks in advance

Paul

they are normally a capacitive microphone type of device, could put a 2nF capacitor across the leads, but I would expect that the ECU should normally adjust to it not being there if disconnected?
but what engine is this on?

Sorry mate, should of mentioned that the engine is an EJ22 from a 96 lib.

How does the ECU interpret the 2nF capacitor? I basically have no idea but am keenly interested in how this works.

Thanks

I really don't think you need to 2nf cap, as the knock signal is AC, if you simply disconnect, the ECU's knock sensor won't hear anything
Is any fault code occuring with it disconnected? maybe the ECU can do a smart check, like check for any signal wilst engine is running.....if it does that, how to get around that? maybe a signal generator...but now its probably getting too complicated.....

Hmmmm....

They do show a fault code with them disconnected. It is possible to simply mount them some where further away from the block but still on the engine.