Avalon 1995-1996

Knock Sensor

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Location



Specific to:

Toyota Avalon 1995-1996



Click image to see an enlarged view

Fig. Knock Sensor (KS) location

Operation



Specific to:

Toyota Avalon 1995-1996

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



Specific to:

Toyota Avalon 1995-1996

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the air cleaner hose.
  4.  
  5. Remove the right-hand engine mounting stay.
  6.  
  7. Remove the water outlet.
  8.  
  9. Disconnect the knock sensor connector.
  10.  
  11. Remove the knock sensor.

    Click image to see an enlarged view

    Fig. Remove the knock sensors

  12.  

To install:

  1. Install the knock sensor and tighten to 29 ft. lbs. (39 Nm).
  2.  
  3. Connect the knock sensor connector.
  4.  
  5. Install the water outlet.
  6.  
  7. Install the right-hand engine mounting stay.
  8.  
  9. Install the air cleaner hose.
  10.  

Testing



Specific to:

Toyota Avalon 1995-1996


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

Knock Sensor Strategy

Specific to:

Toyota Avalon 1995-1996

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:

Toyota Avalon 1995-1996



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Fig. Related Diagnostic Trouble Codes

 
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