TownAndCountry 2008

Knock Sensor

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Operation



Specific to:

Chrysler Town & Country 2008-2009

Dodge Grand Caravan 2008-2009

The Knock Sensor (KS) is a piezo-electric (pressure-sensitive) electronic device that enables the Powertrain Control Module (PCM) 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



3.3L & 3.8L Engines

Specific to:

Chrysler Town & Country 2008-2009

Dodge Grand Caravan 2008-2009

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect and isolate the negative battery cable at the battery.
  4.  
  5. Remove the knock sensor cover (4).
  6.  
  7. Disconnect the electrical connector (1) from the knock sensor (2).
  8.  
  9. Remove the bolt (3) and the knock sensor (2) from the engine.

    Click image to see an enlarged view

    Fig. Knock Sensor (KS) location-3.3L and 3.8L engines

  10.  

To install:


WARNING
Torque the knock sensor to the correct specification. Over or under tightening affects the knock sensor performance, possibly causing improper spark control and damage to the sensor.

  1. Install the knock sensor (2) and the bolt (3) to the engine and tighten to 15 ft. lbs. (20 Nm).
  2.  
  3. Connect the electrical connector (1) to the knock sensor (2).
  4.  
  5. Install the knock sensor cover (4).
  6.  
  7. Connect the negative battery cable and tighten the nut to 45 inch lbs. (5 Nm).
  8.  

4.0L Engine

Specific to:

Chrysler Town & Country 2008-2009

Dodge Grand Caravan 2008-2009

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect and isolate the negative battery cable at the battery.
  4.  
  5. Remove the engine cover.
  6.  
  7. Remove the upper intake manifold. Refer to Intake Manifold, removal & installation.
  8.  
  9. Disconnect the electrical connector.
  10.  
  11. Remove the knock sensor.

    Click image to see an enlarged view

    Fig. Knock Sensor (KS) location-4.0L engine

  12.  

To install:


WARNING
Torque the knock sensor to the correct specification. Over or under tightening affects the knock sensor performance, possibly causing improper spark control and damage to the sensor.

  1. Install the knock sensor and the bolt. Tighten the bolt to 15 ft. lbs. (20 Nm).
  2.  
  3. Route the knock sensor wire in the proper location.
  4.  
  5. Install the upper intake manifold. Refer to Intake Manifold, removal & installation.
  6.  
  7. Connect the electrical connector.
  8.  
  9. Connect the negative battery cable and tighten the nut to 45 inch lbs. (5 Nm).
  10.  

Testing



Specific to:

Chrysler Town & Country 2008-2009

Dodge Grand Caravan 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 Town & Country 2008-2009

Dodge Grand Caravan 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 Town & Country 2008-2009

Dodge Grand Caravan 2008-2009



Click image to see an enlarged view

Fig. Related Diagnostic Trouble Codes

 
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