Knock Sensor Problem

[T-FAST]

My s13 Ka24de for the past few months has been running really bad, I finally figured out how to do the self diagnostic with the ecu and it gave me a code for the knock sensor. Just to make sure that it was the sensor that was bad I went ahead and tested the wiring between the ecu and the sensor and it shows that there is no continuity, obviously indicating that there is some thing wrong with the wiring.

This brings me to my question. Where should I go from here? Should I just go ahead and take apart the harness and look to see where the wire is bad or is there something else I should look at? Thanks in advance

[Davidna2fi]

Question, when you look at the sensor is it litterally look like it's melting? If not, then move onto the wiring. If you had a bunch of oil leaks, and the harness wiring is very hard, you might have corrossion inside the wires and they finally broke away.

[T-FAST]

I just recently bought it back in august and there has definitely been many leaks and such and the wiring is very hard, but when I deleted emissions the knock sensor looked fine cosmetically but that doesn't really matter cause there is no continuity between the ecu and first connector for the sensor

looks like tomorrow I will be going through the harness....

[T-FAST]

Found this: Insulation is melted around the ground wire and very brittle. Does any of this look stock? I am guessing I should just replace the connector and repair the ground wire?

http://i281.photobucket.com/albums/kk214/RGV-Si-/IMG_0263.jpg
http://i281.photobucket.com/albums/kk214/RGV-Si-/IMG_0262.jpg
http://i281.photobucket.com/albums/kk214/RGV-Si-/IMG_0261.jpg

[T-FAST]

Ok I just tested for continuity and there is indeed continuity now but the resistance is really high (9.6) well that seals the deal, looks like I probably just need to fix that wire.

[Davidna2fi]

9.6 ohms is too high. Best thing to do is, at the ECU pin for the knock sensor input, connect one of your probes there, and then the other to where the knock sensor harness is, then make small cuts using a razor blade to expose the wire and just touch the probe to that area on the wire harness, keep doing this until the resistance goes down. If it does not go down when you reach the part on the large bunch of wires to the harness, I'd run new wire from the ECU pin to the knock sensor in the engine bay.

[T-FAST]

good idea! but I found that the ground wire wraps around the signal wire????

[Davidna2fi]

good idea! but I found that the ground wire wraps around the signal wire????

It's a shielded wire, its supposed to be like that. Silimar to the MAF wire layout. That crimp you see is OEM for sure, no one uses that style to join wires together. So which wire are you getting high resistance in? The ground or the white signal wire? Don't cut into the white signal wire though if it has high resistance, very rarely do those go bad, look at the connector and see if it has green corrossion at the pin terminal in the pic you posted

[T-FAST]

It's the signal wire that is getting the high resistance. The connector looks really good and doesn't show any signs of needing to be replaced.