O.K., I need some help here (again). I need to know the EXACT location of the knock sensor on a '92 Celica 5SFE. I'm getting a code 52 which I believe is the knock sensor. If you know the exact location of his sensor, please let me know. If you don't really know, Thanks anyways ... I already know that it is in either the head, the block, or the intake. I could also use test procedures if anyone should happen to know. Thanks in advance, Timm ........
The knock sensor is basically a piezoelectric crystal that operates on the same principle as those "electronic ignition' lighters and push-button sparkers on some gas grills. When the crystal is compressed or twisted, the internal structure of the crystal produces static electricity, which jumps to a nearby ground point. To test the knock sensor, hook up a digital meter, preferably with one that records readings, to the leads on the sensor and rap the block with a hammer. You should get momentary milivolts readings when you rap the block.
I don't recall the exact location of the sensor, but it will be on the side of the block and will have 1 or 2 wires coming out. I believe that the knock sensor is the only sensor actually in the side of the block. The oil pressure sender will be higher up on the block.
The crystal in the knock sensor never wears out so if you're getting a knock sensor code, a more likely cause for the code will be a bad wire between the sensor and ECU. Start by checking continuity between the harness where the sensor plugs in and the ECU, and then check the connector for the sensor and the pigtail from the sensor to the harness.
You're welcome! Good luck with the other guy's insurance company. Hopefrully you came thorugh the accident unscathed.
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