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Knock Sensor: Testing and Inspection
1.
Disconnect
knock sensor connector and remove knock sensor from vehicle. Mount knock sensor in the jaws of a bench vise and connect a voltmeter between terminals 1 and 2.
2.
Wrap on the bench vise sharply with a hammer an observe voltmeter.
3.
Verify that a voltage spike (less than
1 V) is output from the
knock sensor.
4.
If no voltage spike is observed, replace the
knock sensor.