Camry 2007

Knock Sensor

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Operation



Specific to:

Toyota Camry 2007-2008

Knock sensors are fitted onto the engine block to detect engine knocking. The knock sensor contains a piezoelectric element which generates a voltage when the engine block vibrates due to knocking. Any occurrence of engine knocking can be suppressed by delaying the ignition timing.

Removal & Installation



2.4L Engine

Specific to:

Toyota Camry 2007-2008


CAUTION
Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion.

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Properly discharge the fuel system pressure.
  4.  
  5. Disconnect battery negative cable.
  6.  
  7. Remove plastic engine cover.
  8.  
  9. Drain and recycle the engine coolant.
  10.  
  11. Remove windshield wiper arms and blade assemblies.
  12.  
  13. Remove both front fender to cowl side seals.
  14.  
  15. Remove cowl top ventilator louver sub-assembly.
  16.  
  17. Remove windshield wiper motor and link.
  18.  
  19. Remove the four bolts, four nuts and cowl top panel outer sub-assembly.
  20.  
  21. Remove air cleaner cap sub-assembly.
  22.  
  23. Remove air cleaner case sub-assembly.
  24.  
  25. Remove throttle body.
  26.  
  27. Disconnect fuel tube.
  28.  
  29. Remove fuel delivery pipe with injector.
  30.  
  31. Disconnect the union to check valve hose from the brake booster.
  32.  
  33. Disconnect the camshaft timing oil control valve connector.
  34.  
  35. Remove the wire harness clamp.
  36.  
  37. Remove the union to check valve hose from the vacuum hose clamp.
  38.  
  39. Remove the 5 bolts, 2 nuts and intake manifold. Remove the gasket from the intake manifold.
  40.  
  41. Disconnect the knock sensor connector. Remove the nut and knock sensor.

    Click image to see an enlarged view

    Fig. Removing the nut and knock sensor-2.4L Engine

  42.  

To install:


NOTE
Make sure that the knock sensor is in the correct position.

  1. Install the knock control sensor with the nut and tighten to 15 ft. lbs. (20 Nm).

    Click image to see an enlarged view

    Fig. Installing the nut and knock sensor-2.4L Engine

  2.  
  3. Connect the knock control sensor connector.
  4.  
  5. The remainder of installation is the reverse of the removal procedure.
  6.  
  7. Inspect for fuel leak and check the function of throttle body.
  8.  

3.5L Engine

Specific to:

Toyota Camry 2007-2008


CAUTION
Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion.

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Properly discharge the fuel system pressure.
  4.  
  5. Disconnect battery negative cable.
  6.  
  7. Drain and recycle the engine coolant.
  8.  
  9. Remove both plastic engine under covers.
  10.  
  11. Remove windshield wiper arms and blade assemblies.
  12.  
  13. Remove both of the front fender to cowl side seals.
  14.  
  15. Remove cowl top ventilator louver sub-assembly.
  16.  
  17. Remove the windshield wiper motor and link assembly.
  18.  
  19. Remove the outer cowl top panel.
  20.  
  21. Remove the cool air intake duct seal.
  22.  
  23. Remove the V-bank cover sub-assembly.
  24.  
  25. Remove air cleaner inlet assembly.
  26.  
  27. Remove the air cleaner cap sub-assembly.
  28.  
  29. Remove air cleaner case sub-assembly.
  30.  
  31. Remove the intake air surge tank.
  32.  
  33. Remove no. 1 air cleaner inlet.
  34.  
  35. Separate fuel tube sub-assembly.
  36.  
  37. Remove the intake manifold.
  38.  
  39. Disconnect the 2 knock control sensor connectors.
  40.  
  41. Remove the 2 bolts and 2 knock control sensors.

    Click image to see an enlarged view

    Fig. Removing knock sensor-3.5L Engine

  42.  

To install:

  1. Install the 2 knock control sensors with the 2 bolts as shown in the illustration and tighten to 15 ft. lbs. (20 Nm).

    Click image to see an enlarged view

    Fig. Installing knock sensor-3.5L Engine

  2.  
  3. Connect the 2 knock control sensor connectors.
  4.  
  5. The remainder of installation is the reverse of the removal procedure.
  6.  
  7. Inspect for fuel leak and check the function of throttle body.
  8.  

Testing



Specific to:

Toyota Camry 2007-2008

Using an ohmmeter, measure the resistance between terminals. Resistance should be 120 to 280 kohm at 68°F (20°C). If the resistance is not as specified, replace the sensor.

 
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