Avenger 2008

Knock Sensor

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Operation



Specific to:

Chrysler Sebring 2008-2009

Dodge Avenger 2008-2009

The Knock Sensor (KS) is a piezo-electric (pressure-sensitive) electronic device that enables the Powertrain Control Module (PSM) to control the ignition timing for optimum performance, and to protect the engine from potentially damaging levels of detonation. The PCM uses the KS system to test for abnormal engine noise that may indicate detonation, which is also known as spark knock.

Removal & Installation



2.4L Engine

Specific to:

Chrysler Sebring 2008-2009

Dodge Avenger 2008-2009

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the bolt holding the knock sensor.

    Click image to see an enlarged view

    Fig. Remove the bolt holding the knock sensor

  4.  
  5. Remove sensor with electrical connector attached.
  6.  
  7. Disconnect electrical connector from knock sensor.
  8.  
  9. Remove the knock sensor.
  10.  

To install:

  1. Attach electrical connector to knock sensor.
  2.  
  3. Install knock sensor. Tighten knock sensor bolt to 195 inch lbs. (22 Nm).
    NOTE
    Over or under tightening effects knock sensor performance, possibly causing improper spark control.

  4.  
  5. Connect the negative battery cable.
  6.  

2.7L Engine

Specific to:

Chrysler Sebring 2008-2009

Dodge Avenger 2008-2009


WARNING
Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.

  1. Drain cooling system.
  2.  
  3. Disconnect and isolate the negative battery cable.
  4.  
  5. Remove lower intake manifold.
  6.  
  7. Remove upper radiator hose (3) at water housing outlet tube (4).

    Click image to see an enlarged view

    Fig. Remove upper radiator hose (3) at water housing outlet tube (4)

  8.  
  9. Remove heater hose (5) from water housing outlet tube (4) at rear of engine.
  10.  
  11. Disconnect water housing outlet tube (4) from retaining clip (6) at rear of engine.
  12.  
  13. Disconnect electrical connector (2) from coolant temperature sensor.
  14.  
  15. Remove 4 bolts (1) attaching water housing outlet tube (4) to cylinder heads.
  16.  
  17. Disconnect electrical connector from knock sensor.

    Click image to see an enlarged view

    Fig. Disconnect electrical connector from knock sensor

  18.  
  19. Reposition the water housing outlet tube and remove nut (2) from knock sensor mounting stud (1).

    Click image to see an enlarged view

    Fig. Remove nut (2) from knock sensor mounting stud (1)

  20.  
  21. Remove knock sensor (3) from engine block.
  22.  

To install:


CAUTION
Over or under tightening effects knock sensor performance resulting in possible improper spark control.

  1. Install knock sensor and nut onto stud.
  2.  
  3. Tighten knock sensor nut to 11 ft. lbs. (15 Nm).
  4.  
  5. Attach electrical connector to knock sensor.
  6.  
  7. Position the water housing outlet tube to the cylinder heads and loosely install four bolts.
  8.  
  9. Attach water housing outlet tube to the retaining clip at rear of engine.
  10.  
  11. Connect electrical connector to the coolant temperature sensor.
  12.  
  13. Install heater hose to water housing outlet tube at rear of engine.
  14.  
  15. Install upper radiator hose to water housing outlet tube.
  16.  
  17. Install intake manifold.
  18.  
  19. Connect negative battery cable.
  20.  
  21. Fill cooling system.
  22.  
  23. Operate engine until it reaches normal operating temperature.
  24.  
  25. Check cooling system for correct fluid levels.
  26.  

3.5L Engine

Specific to:

Chrysler Sebring 2008-2009

Dodge Avenger 2008-2009

  1. Remove the engine cover.
  2.  
  3. Perform the fuel pressure release procedure.
  4.  
  5. Drain the cooling system.
  6.  
  7. Disconnect and isolate the negative battery cable.
  8.  
  9. Remove the air cleaner body.
  10.  
  11. Remove the upper and lower intake manifolds.
  12.  
  13. Disconnect electrical connector from knock sensor.

    Click image to see an enlarged view

    Fig. Disconnect electrical connector from knock sensor

  14.  
  15. Remove the knock sensor from the engine block.
  16.  

To install:


CAUTION
Always use the specified torque when installing the knock sensor bolt. Over or under tightening the sensor mounting bolt will affect knock sensor performance, possibly causing improper spark control.

  1. Install knock sensor. Tighten knock sensor to 15 ft. lbs. (20 Nm).
  2.  
  3. Route the knock sensor wire in the proper location.
  4.  
  5. Connect the electrical connector.
  6.  
  7. Install the upper and lower intake manifolds.
  8.  
  9. Install the air cleaner body.
  10.  
  11. Connect the negative battery cable.
  12.  
  13. Fill cooling system.
  14.  
  15. Operate engine until it reaches normal operating temperature.
  16.  
  17. Check cooling system for correct fluid levels.
  18.  
  19. Install the engine cover.
  20.  

Testing



Specific to:

Chrysler Sebring 2008-2009

Dodge Avenger 2008-2009


NOTE
Refer to the Electrical Wiring Diagram for component and connector locations, connector views, and circuit-specific information.

Knock Sensor Strategy

Specific to:

Chrysler Sebring 2008-2009

Dodge Avenger 2008-2009

The Knock Sensor (KS) system uses one or two broadband one-wire sensors. The Knock Sensor generates an AC voltage signal of varying amplitude and frequency based on the engine vibration. The amplitude and frequency are dependent upon the level of knock that the KS detects. The control module receives the KS signal through a signal circuit, and the KS ground is supplied by the engine block through the sensor housing.

Click image to see an enlarged view

Fig. Active Knock Sensor (KS) Pattern

Related Diagnostic Trouble Codes

Specific to:

Chrysler Sebring 2008-2009

Dodge Avenger 2008-2009



Click image to see an enlarged view

Fig. Related Diagnostic Trouble Codes

 
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