Sentra 2007

Knock Sensor

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Location



2.0L Engine

Specific to:

Nissan Sentra 2007-2012



Click image to see an enlarged view

Fig. The Knock Sensor (KS) is mounted on the engine block below the intake manifold.

2.5L Engine

Specific to:

Nissan Sentra 2007-2012



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Fig. The Knock Sensor (KS) is on the front of the engine block near the oil cooler.

Removal & Installation



Specific to:

Nissan Sentra 2007-2012

  1. Remove the bolt to remove the sensor from the engine block.
  2.  
  3. During installation, do not over tighten the bolt or the sensor will not function properly.
  4.  

Operation



Specific to:

Nissan Sentra 2007-2012

The Knock Sensor (KS) attached to the cylinder block senses engine knocking using a piezoelectric element. A knocking vibration from the cylinder block is sensed as extremely rapid pressure changes (vibration). This pressure change is converted into a voltage signal and sent to the ECM.

Testing



Specific to:

Nissan Sentra 2007-2012

  1. Turn ignition switch OFF and wait at least 10 seconds before going to the next step.
  2.  
  3. Confirm that battery voltage is more than 11V with the engine at idle.
  4.  
  5. Start engine and warm it up to normal operating temperature.
  6.  
  7. Let it idle for 2 minutes and check for 1st trip DTC. If there is no code, the sensor is working properly or the problem is intermittent. Check the sensor power and ground circuits.
    WARNING
    Connect the voltmeter ground probe to engine or chassis ground. Do not test circuits with the meter connected to the battery or the ECM may be damaged.

  8.  
  9. Disconnect knock sensor harness connector and ECM harness connector.
  10.  
  11. Check the continuity between knock sensor harness connector and ECM harness connector. Also check for short circuits to power or ground.
  12.  
  13. Check resistance across the sensor connector terminals. Resistance should be approximately 532,000-588,000 ohms at room temperature.

    Click image to see an enlarged view

    Fig. Active Knock Sensor (KS) Pattern

  14.  

 
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