Knock Sensor: Inspection
- 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.
- Wrap on the bench vise sharply with a hammer and observe voltmeter.
- Verify that a voltage spike (less than 1V) is output from the knock sensor.
- If no voltage spike is observed, replace the knock sensor.