CR-V 2007-2008

Variable Camshaft Timing Oil Control Solenoid

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Operation



Specific to:

Honda CR-V 2007-2008

The Variable Camshaft Timing Oil Control Solenoid (VCTOCS) system is installed to the chain sprocket of the camshafts. This system controls the camshafts to provide the optimal valve timing for every driving condition. The PCM receives signals of crankshaft position, camshaft position, engine speed, and engine coolant temperature, and then sends ON/OFF pulse duty signals to the VCTOCS-also called the Variable Valve Timing Control (VTC) solenoid valve.

The VCTOCS or VTC control solenoid valve controller regulates the camshaft angle using oil pressure through the VCTOCS. As a result, the relative position between the camshaft and the crankshaft becomes optimal. The engine torque improves, fuel economy improves, and the exhaust emissions decrease within the overall driving conditions.

The VCTOCS system makes continuous valve timing changes based on operating conditions. Intake valve timing is optimized to allow the engine to produce maximum power. Cam angle is advanced to obtain the EGR effect and reduce pumping loss. The intake valve is closed quickly to reduce the entry of the air/fuel mixture into the intake port and improve the changing effect. Reducing the cam advance at idle stabilizes combustion and reduces engine speed. If a malfunction occurs, the VCTOCS system control is disabled and the valve timing is fixed at the fully retarded position.

Click image to see an enlarged view

Fig. Variable Valve Timing Control (VTC) system illustrated

Removal & Installation



Specific to:

Honda CR-V 2007-2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the Variable Camshaft Timing Oil Control Solenoid (VCTOCS), also called the Variable Timing Control (VTC) oil control solenoid valve 2P connector (A).
  4.  
  5. Remove the mounting bolt (B) and the VTC oil control solenoid valve (C).
  6.  

To install:

  1. Replace the VTC valve O-ring. Coat a new O-ring with clean engine oil, then install it.
  2.  
  3. Clean and dry the mating surface of the valve.
  4.  
  5. Install the VTC solenoid valve. Tighten the mounting bolt to 104 inch lbs. (12 Nm).
  6.  
  7. Connect the 2P connector.
    NOTE
    Do not install the valve while wearing cloth fibrous gloves. Be careful not to contaminate the cylinder head opening.



    Click image to see an enlarged view

    Fig. View of the VTC oil control solenoid during removal

  8.  

Testing



Specific to:

Honda CR-V 2007-2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Check the Variable Timing Control (VTC) oil control solenoid valve strainer for clogging. If the strainer is clogged, replace the VTC oil control solenoid valve.
  4.  
  5. Note the amount of valve opening by observing the position of the piston shoulder (A) through the valve retard drain port. If you see the shoulder of the piston, the valve is open and must be replaced.

    Click image to see an enlarged view

    Fig. Note the amount of valve opening at (A) through the valve retard drain port. If you see the shoulder of the piston (without voltage applied), the valve is open and must be replaced

  6.  
  7. Connect the battery positive terminal to the VTC oil control solenoid valve 2P connector terminal No. 2.
  8.  
  9. Connect the battery negative terminal to the VTC oil control solenoid valve 2P connector terminal No. 1.
    1. The appearance of the inner valve (A) in the port should be at least 0.05 inch (1.2mm). If the inner valve does not open, replace it.
    2.  

  10.  

 
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