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Home >> Chevrolet >> 1990 >> APV >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Knock Sensor
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Knock Sensor

  1. Leave knock sensor harness connector connected. Using a voltmeter, backprobe knock sensor connector. Connect voltmeter between sensor terminal and ground. Set voltmeter to 2-volt AC scale.
  2. Start and idle engine. Tap on engine block near sensor. A signal should be indicated on voltmeter. If no signal is indicated, replace knock sensor. Also see TIMING CONTROL SYSTEMS in this article and appropriate TESTS W/CODES article.
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