wrestler72

I posted this in another topic so sorry for those that gotta see it more than once. I was just wondering what causes the ECU to throw a knock sensor code, not looking to bypass it just want to know why it would throw the code. This morning driving into work a brought the car up to like 4500 and it threw a check engine light for the knock sensor. By the way its a 90 crx with a B16A swap, its has complete valvtrain done and a 2 1/2 inch exhaust. I searched and sorry but im not going through 900+ threads.

GhostAccord

The first page of this link has a good description of how they work.
How a knock sensor works
It's not a Honda specific write up but all knock sensors do the same thing.

khooper

the cars connector or wiring is probably damaged. If you have replaced the knock sensor, then defenitely reset your ECU. Once that is complete, you should have full power almost immediately.
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wrestler72

Yea im gunna check it out this weekend. I was just wondering what would cause it outta the blue. Just wanted to know what the purpose of it is. I see everyone bypassing them and what not and was curious