E320 1999

Knock Sensor

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Location





Click image to see an enlarged view

Fig. KS sensor location

Operation



The KS sensor enables the ME engine controller to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The control module uses the KS sensor to test for abnormal engine noise that may indicate detonation, also known as spark knock.

Removal & Installation



M112 & M113 Engines
  1. Before servicing the vehicle, refer to the precautions.
  2.  
  3. Remove air filter housing.
  4.  
  5. Remove resonance intake manifold.
  6.  
  7. Disconnect electrical connector at right knock sensor or left knock sensor.
  8.  
  9. Remove bolt and take out right knock sensor or left knock sensor.

    Click image to see an enlarged view

    Fig. KS sensor location

  10.  

To install:

  1. Installation is the reverse of removal.
  2.  
  3. Tighten knock sensor to crankcase bolt to 15 ft. lbs. (20 Nm).
  4.  
  5. Connect STAR DIAGNOSIS or equivalent scan tool and read out fault memory.
  6.  

Testing



All Mercedes Benz electronic testing is performed by reading the fault memory of ME control unit and if necessary, working through test schedules contained in the STAR DIAGNOSIS tool.

 
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