In this video I will show you how to quickly test a knock sensor circuit. This procedure applies to any knock sensor that has a bias voltage sent to it and is not unique to Nissan. Other manufactures are doing the same thing, making the circuit very easy to test.

Engine Performance Diagnostics chapter 10 pages 6-7


  • check engine light with a P0328 trouble code
  • poor fuel economy (2-3 mpg less than normal)

fix 50

  • replace knock sensor

test shown

  • how to test a knock sensor circuit for opens and shorts
  • how to measure the resistance of a knock sensor

Tools used

  • scan tool
  • digital multimeter
  • backprobing tools

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(Chapters 9, 10 and 11) The 5v Reference and Signal Circuit Quick Tests

Related videos:

EVAP leak P0455 (vacuum cut valve-bypass valve test) - Nissan:


Oxygen Sensor Slow Response test (P0134) - Nissan:


How to test a Knock Sensor (P0328) - Subaru:


GM Fuel Pump Relay Testing:


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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

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On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!