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Home >> Geo >> 1991 >> Prizm LSi, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Knock Sensor
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Knock Sensor

  1. Check knock sensor resistance using ohmmeter. Measure resistance between knock sensor terminal and engine block. Knock sensor is located on rear of engine block and has a Black wire connector. Replace knock sensor if resistance is not 3300-4500 ohms.
  2. To check knock sensor operation, remove connector from knock sensor. Connect DVOM between knock sensor terminal and ground. Adjust voltmeter to 200 millivolts on AC scale.
  3. Tap on engine block near knock sensor and note reading. Replace knock sensor if no reading is obtained.
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