2000 Accord knock sensor troubleshooting

I'm trying to test the knock sensor on a 2000 Accord 4 cylinder. The Haynes service manual procedure involves draining the engine oil removing the sensor and measuring the AC voltage generated by the
sensor by lightly tapping it with a hammer. This sensor is basically a microphone. Why would it have to be removed from the engine block to perform this test ? I would think that tapping the block where its mounted should generate a reasonable test signal.
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Jay Fowler wrote:

agreed.
the advantage of removal however is that if there's a bad mechanical connection, which i guess is possible, you'll remake it on reinstallation, and hopefully make sure it's good. it also depends on the sensor head's physical connection point. if it's screwed through the block to touch the wet liner, the outside tapping thing may not be that effective.
last thing: haynes recommend tapping the sensor directly with a hammer? geeze, those people need their heads tapping with a hammer. if ever i needed reminding why haynes manuals are to be avoided...
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