Kia_Sephia_Rio_Spectra_Optima_1998-2006

Knock Sensor (KS)

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Removal & Installation



2001-2005
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the intake manifold support bracket.
  4.  
  5. Disconnect the sensor connector.
  6.  
  7. Remove the sensor from its mounting.
  8.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Tighten the sensor to 12-18 ft. lbs.
  4.  

2006
  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the sensor connector.
  4.  
  5. Remove the sensor from its mounting.
  6.  

To install:

  1. Installation is the reverse of the removal procedure.
  2.  
  3. Tighten the sensor to 12-18 ft. lbs.
  4.  

Testing



2001-2005
  1. Disconnect the sensor electrical connector.
  2.  
  3. Remove the sensor from the engine.
  4.  
  5. Mount the sensor in the jaws of a bench vise.
  6.  
  7. Connect a voltmeter between terminal 1 and 2.
  8.  
  9. Wrap the bench vise sharply with a hammer and note the voltmeter reading.
  10.  
  11. Verify that the voltage spike is less than 1 volt.
  12.  
  13. If no voltage spike is observed, replace the sensor.
  14.  

2000-2003
  1. Disconnect the sensor electrical connector.
  2.  
  3. Remove the sensor from the engine.
  4.  
  5. Mount the sensor in the jaws of a bench vise.
  6.  
  7. Connect a voltmeter between terminal 1 and 2.
  8.  
  9. Wrap the bench vise sharply with a hammer and note the voltmeter reading.
  10.  
  11. Verify that the voltage spike is less than 1 volt.
  12.  
  13. If no voltage spike is observed, replace the sensor.
  14.  

2004-2005
  1. Be sure that the ECM and sensor connectors are connected.
  2.  
  3. Connect the scan tool.
  4.  
  5. Start the engine and monitor the knock sensor signal at idle.
  6.  
  7. If the signal is not normal, replace it.
  8.  
  9. Turn the ignition switch OFF.
  10.  
  11. Disconnect the sensor electrical connector.
  12.  
  13. Measure the capacitance between terminal 1 and 2 of the sensor connector.
  14.  
  15. Specification should be 800-1600 pF.
  16.  
  17. If not within specification, replace the sensor.
  18.  

2006

NOTE
If the sensor is suspected of being defective, it should be replaced with a known good component for testing purposes.

  1. Replace the sensor with a known good component.
  2.  
  3. If the signal is normal, replace the sensor.
  4.  
  5. If the signal is still not normal, replace the ECM/PCM with a known good component and recheck. Replace the component as required.
  6.  

  1. Turn the ignition switch OFF.
  2.  
  3. Disconnect the sensor electrical connector. Connect an ohmmeter.
  4.  
  5. Measure the resistance between terminals 1 and 2 of the sensor connector (component side).
  6.  
  7. Specification should be 5mohm at 68°F.
  8.  
  9. If not within specification, replace the sensor.
  10.  
  11. To check the output signal, remove the sensor from its mounting.
  12.  
  13. Mount the sensor in the jaws of a bench vise.
  14.  
  15. Connect a voltmeter between terminal 1 and 2.
  16.  
  17. Wrap the bench vise sharply with a hammer and note the voltmeter reading.
  18.  
  19. Verify that the voltage spike is less than 1 volt.
  20.  
  21. If no voltage spike is observed, replace the sensor.
  22.  

Operation



The knock sensor is used to detect engine vibrations caused by preignition or detonation and provides information to the ECM, which then retards the timing to eliminate detonation.

The knock sensor is used to detect engine vibrations caused by preignition or detonation and provides information to the ECM, which then retards the timing to eliminate detonation.

The knock sensor is used to detect engine vibrations caused by preignition or detonation and provides information to the ECM, which then retards the timing to eliminate detonation.

 
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