Mazda Car 2005-06

Knock Sensor (KS)

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Operation



The Knock Sensor (KS) converts the vibration of the cylinder block into a voltage and outputs it. If there is a malfunction of the knock sensor, the voltage output will not change. The PCM checks whether the voltage output changes.

The Knock Sensor (KS) converts the vibration of the cylinder block into a voltage and outputs it. If there is a malfunction of the knock sensor, the voltage output will not change. The PCM checks whether the voltage output changes.

Removal & Installation



  1. Disconnect the negative battery cable.
  2.  
  3. Remove the intake manifold.
  4.  
  5. Disconnect the sensor connector.
  6.  
  7. Remove the sensor from the engine block.
  8.  
  9. Installation is the reverse of the removal procedure.

    Click image to see an enlarged view

    Fig. Knock sensor removal and installation-Mazda 3

  10.  

2.3L
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the intake manifold.
  4.  
  5. Disconnect the sensor connector.
  6.  
  7. Remove the sensor from the engine block.
  8.  
  9. Installation is the reverse of the removal procedure.

    Click image to see an enlarged view

    Fig. Knock sensor removal and installation-Mazda 6 L4

  10.  

3.0L V6
  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the sensor connector.
  4.  
  5. Remove the sensor from the engine block.
  6.  
  7. Installation is the reverse of the removal procedure.
  8.  

Testing



  1. Turn the ignition switch to the "LOCK" (OFF) position.
  2.  
  3. Disconnect the knock sensor connector.
  4.  
  5. Using an ohmmeter, measure the resistance between the knock sensor terminal A and B. Standard value: 4870 kohms at approximately 68°F.
  6.  
  7. If within specifications, check connectors and wiring between the sensor and ECM/PCM. If ok, replace ECM/PCM.
  8.  
  9. If not within specifications, replace the knock sensor.
  10.  

  1. Turn the ignition switch to the "LOCK" (OFF) position.
  2.  
  3. Disconnect the knock sensor connector.
  4.  
  5. Using an ohmmeter, measure the resistance between the knock sensor terminal A and B. Standard value: 4870 kohms at approximately 68°F.
  6.  
  7. If within specifications, check connectors and wiring between the sensor and ECM/PCM. If ok, replace ECM/PCM.
  8.  
  9. If not within specifications, replace the knock sensor.
  10.  

 
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