Aura, Outlook 2007

Knock Sensor

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Operation



The Knock Sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The KS produces an AC voltage signal that varies depending on the vibration level during engine operation. The control module receives the KS signal through 2 isolated signal circuits. The control module adjusts the spark timing based on the amplitude and the frequency of the KS signal.

Removal & Installation



2.4L Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Disconnect the engine wiring harness electrical connector from the Knock Sensor (KS) pigtail electrical connector.
  6.  
  7. Remove the knock sensor electrical connector pigtail clip from the oil level indicator tube bracket.
  8.  
  9. Remove the knock sensor bolt.
  10.  
  11. Remove the knock sensor.
  12.  

To install:


NOTE
Rotate the pigtail 90 degrees from vertical before securing the fastener.

  1. Installation is the reverse of removal. Tighten the KS bolt to 18 ft. lbs. (25 Nm).
  2.  

3.5L Engine
Bank 1
  1. Disconnect the negative battery cable.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Disconnect the engine wiring harness electrical connector from the Knock Sensor (KS).
  6.  
  7. Remove the knock sensor bolt and sensor.
  8.  

To install:

  1. Installation is the reverse of removal. Tighten the KS bolt to 18 ft. lbs. (25 Nm).
  2.  

Bank 2
  1. Disconnect the negative battery cable.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Disconnect the engine wiring harness electrical connector from the Knock Sensor (KS).
  6.  
  7. Remove the knock sensor bolt and sensor.
  8.  

To install:

  1. Installation is the reverse of removal. Tighten the KS bolt to 18 ft. lbs. (25 Nm).
  2.  

3.6L Engine
Bank 1
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the exhaust manifold lower heat shield.
  4.  
  5. Disconnect the engine wiring harness electrical connector from the Knock Sensor (KS).
  6.  
  7. Remove the knock sensor bolt and sensor.
  8.  

To install:

  1. Installation is the reverse of removal. Tighten the KS bolt to 17 ft. lbs. (23 Nm).
  2.  

Bank 2
  1. Disconnect the negative battery cable.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Disconnect the engine wiring harness electrical connector from the Knock Sensor (KS).
  6.  
  7. Remove the knock sensor bolt and sensor.
  8.  

To install:

  1. Installation is the reverse of removal. Tighten the KS bolt to 17 ft. lbs. (23 Nm).
  2.  

Testing





Click image to see an enlarged view

Fig. Knock Sensor (KS) sensor-2.4L engine terminals (A) KS signal (B) KS signal

  1. Connect a digital Multi Meter (DMM) from the KS signal circuit terminal A to the KS signal circuit terminal B on the sensor side of the KS harness connector.
  2.  
  3. Set the DMM to the 400 mV AC hertz scale and wait for the DMM to stabilize at 0 Hz.
    NOTE
    DO NOT tap on plastic engine components.

  4.  
  5. Tap on the engine block with a non-metallic object near the KS while observing the signal indicated on the DMM.
  6.  
  7. The DMM should display a fluctuating frequency while tapping on the engine block.

    Click image to see an enlarged view

    Fig. Knock Sensor 1 (KS) sensor terminals-3.5L and 3.6L engines (A) KS 1 Signal (B) KS 1 Signal



    Click image to see an enlarged view

    Fig. Knock Sensor 2 (KS) sensor terminals-3.5L and 3.6L engines (A) KS 2 Signal (B) KS 2 Signal

  8.  

 
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