Knock Sensor Harness

[dantesdoom]

Finally got my sensor, the harness, bolts, washers and locktight to relocate my knock sensor....got it all hooked up...and code 34...again...heres my question: I took it all back apart, and when i mulitmetered the cars connector on the wiring harness is is OK, but i have some trouble with the cable.....on the grey end i have TWO post in the connector...on the end that attaches to the knock sensor...i have only ONE female adapter. Also, on the knock sensor, i can touch the mulitmeter to both post but i don't get a connection, but i can touch it to the metal donut center and get a reading on ONE post only. This might be a grounding issue with it...as i had it off the car, but layed on metal. Really i think that cable is bad because im lacking that female connector post, and i was wondering if it was supposed to be like that or not...let me so i can get another one from Z1motorsports this week if this be the case. Thanks!

[dantesdoom]

Heres a pic of the cable and the connectors...note that the bottom connector in the top picture is missing the left metal piece (not relection of cameras flash).

[dozug]

maybe your sensor is bad. not just the harness..

[dantesdoom]

Bump

[suicide commando]

im having the exact same problem. any ideas?

[schwar74]

I just had an issue with my KS after a plenum pull. I pulled/broke the wire off the sensor in its original home in the nether regions of the motor because it was hooked to the plenum by a zip tie and I didn't realize it until it was too latee. It was in pretty rough shape though, very brittle. Anyway, when I dismantled the sub harness I was interested to see that there were two wires coming from the main engine harness, but that under the insulation, the black wire became just a wire "mesh" that surrounded the white wire. I think there is only one wire that actually attached to the knock sensor. In trying to figure out if this was right, I looked at the wiring diagram at http://z32.wikispaces.com/ECU+Harness+Diagram, and it shows just one wire, the white one, and the black one is just some kind of shroud. So I think the sub harness you got is correct.

Have you tried resetting the ECU? Disconnect the battery overnight, and this should clear the codes, then you can start over and see if it still shows up.

Scott

[RubyRed300ZX]

The harness, from the ECU to the knock sensor, has a second "wire" (black) which does not "connect" to the knock sensor. The second "wire" is in actuality and EMI shield. It's a mesh shield somewhat analogous to what you will find around a co-axial cable. It's an EMI (Electro-Magnetic Interference) shield to prevent the "white" wire from picking up transient electrical voltages from adjacent circuits within the main wiring harness. As such, that "wire" terminates at the plug without a connection (e.g., it is not a circuit). Only the white wire makes a completed circuit.

So, yes there should be two prongs for the connector on the harness side (which connects to the main harness); and one prong on the sensor end of the sub-harness.