http://www.zhome.com/ZCMnL/PICS/detonationSensor/detonationSensor.html Specifically: "Using the multitester as an ohm-meter, test the connections going to the ECU. One of the wire going to the ECU should be connected to the "ground" of the engine. (a good "ground" can be found on any metallic part of the intake manifold) The second wire going to the ECU should have about 500 k Ohm resistance when tested towards the "ground" of the engine. One of the wire doing to the detonation sensor IS NOT CONNECTED (both US and EUROPEAN manuals are saying "connected to the ground", I've found this incorrect while testing the connection, as well as looking at the wiring diagram of the harness) The second wire should display about 1 meg Ohm resistance." Also, using a non-oem knock sensor is asking for trouble. It's worth the small investment to buy a Nissan sensor. Also be sure you are using the correct torque spec on the bolt.
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