Santa Fe, Vera Cruz 2006-2008

Variable Camshaft Timing Oil Control Solenoid

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Operation



Specific to:

Hyundai Santa Fe 2006-2008

Hyundai Veracruz 2007-2008

The Continuously Variable Valve Timing (CVVT) system is installed to the chain sprocket of the intake camshaft. This system controls the intake camshaft to provide the optimal valve timing for every driving condition. The ECM/PCM controls the Variable Camshaft Timing Oil Control Solenoid (VCTOCS)-also known as the Oil Control Valve (OCV)-based on the signal outputs from the Mass Air Flow (MAF) sensor, Throttle Position Sensor (TPS), and Engine Coolant Temperature (ECT) sensor. The CVVT controller regulates the intake 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 CVVT system makes continuous intake 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 CVVT system control is disabled and the valve timing is fixed at the fully retarded position.

Click image to see an enlarged view

Fig. Continuously Variable Valve Timing (CVVT) system illustrated

Removal & Installation



Specific to:

Hyundai Santa Fe 2006-2008

Hyundai Veracruz 2007-2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the ground cable from the battery.
  4.  
  5. Disconnect the connector from Variable Camshaft Timing Oil Control Solenoid (VCTOCS) on the right-hand bank and/or left-hand bank.
  6.  
  7. Remove the bolt retaining the VCTOCS.
  8.  
  9. Remove the VCTOCS.
  10.  

To install:


NOTE
Always use a new gasket/O-ring.

  1. Install the VCTOCS.
  2.  
  3. Tighten the mounting bolt to 86-104 inch lbs. (20-39 Nm).
  4.  
  5. Connect the electrical connector to the VCTOCS.
  6.  

Testing



Specific to:

Hyundai Santa Fe 2006-2008

Hyundai Veracruz 2007-2008

  1. Ensure the vehicle has the proper oil viscosity and that the oil is not overdue maintenance.
  2.  
  3. Observe the engine oil level. The engine oil level should be within the operating range.
  4.  
  5. Allow the engine to reach operating temperature.
  6.  
  7. Connect a suitable OBD2 scan tool to the Data Link Connector (DLC) inside the vehicle.
  8.  
  9. Increase the engine speed to 1,500 RPM.
  10.  
  11. Command each solenoid to 25 percent. The angle desired parameter should match the solenoid actual parameter.
  12.  

Circuit Testing

Specific to:

Hyundai Santa Fe 2006-2008

Hyundai Veracruz 2007-2008

  1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, mechanical or chemical damage.
  2.  
  3. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
  4.  
  5. Check the supply voltage to the Variable Camshaft Timing Oil Control Solenoid (VCTOCS).
    1. With the ignition "OFF," disconnect the VCTOCS connector.
    2.  
    3. Turn the ignition "ON" with the engine "OFF."
    4.  
    5. Measure the voltage between the power terminal of the harness connector and a chassis ground. The specification: battery voltage (12 volts).

      If the 12 volt supply is not present, check the fuse between the Main Relay and the VCTOCS for an open condition, check for an open in power circuit between the Main Relay and the VCTOCS power circuit
       
      Make the repairs as necessary
       

    6.  

  6.  
  7. Check for a short to ground in the harness.
    1. With the ignition "OFF," disconnect the VCTOCS connector.
    2.  
    3. Measure the resistance between the control terminal of the VCTOCS harness connector and a good chassis ground. The specification: Infinite resistance.

      If the measured resistance is within specification, refer to Component Testing for the VCTOCS
       
      If the measured resistance is not within specification, repair or replace as necessary
       

    4.  

  8.  

Component Testing

Specific to:

Hyundai Santa Fe 2006-2008

Hyundai Veracruz 2007-2008

  1. Measure the resistance of each variable camshaft timing oil control solenoid valve assembly. Resistance should read according to the resistance specification table shown.
    1. Ignition "OFF."
    2.  
    3. Disconnect Variable Camshaft Timing Oil Control Solenoid (VCTOCS) connector.
    4.  
    5. Measure resistance between terminals 1 and 2 of the VCTOCS connector (component side).

      Specification: Approx. 6.9-7.9 ohms at 68°F (20°C)
       
      If not according to specification, replace the oil control solenoid
       

    6.  

  2.  
  3. Check the operation of the VCTOCS.
    1. Start the engine and let it idle.
    2.  
    3. With VCTOCS connector still disconnected, connect a 12 volt supply to terminal 2 and a ground to terminal 1 of the VCTOCS (component side).

      The engine should suddenly run rough at idle or stall out as the VCTOCS abruptly changes the timing
       
      If the engine runs rough or stalls when the 12 volt supply is connected, check for connection problems to the VCTOCS or problem with the supply side from the ECM/PCM
       
      If no change is noted, the VCTOCS may be defective

      Click image to see an enlarged view

      Fig. Use an ohmmeter to check the resistance level of the oil control solenoid



      Click image to see an enlarged view

      Fig. Resistance table for the oil control solenoid compared to temperature

       

    4.  

  4.  
  5. Check the VCTOCS and oil filter assembly.
    1. Turn the ignition "OFF."
    2.  
    3. Check VCTOCS filter for sticking or contamination.
    4.  
    5. Remove the VCTOCS and visually check the spool column of VCTOCS for contamination.
    6.  
    7. If a problem is found, clean or replace as necessary.
    8.  
    9. If no problem is found:

      Apply a 12 volt supply to terminal 2 and a ground to terminal 1 of the VCTOCS (Component side)
       
      Verify that a -clicking- sound is heard when applying the battery voltage
       
      If no -clicking- is heard, replace the VCTOCS
       

    10.  

  6.  

Timing Inspection

Specific to:

Hyundai Santa Fe 2006-2008

Hyundai Veracruz 2007-2008

  1. With the ignition "OFF," set up an oscilloscope as follows:
    1. Channel A (+): terminal 2 of the CKPS (back probe), (-): ground.
    2.  
    3. Channel B (+): terminal 2 of the CMPS (back probe), (-): ground.
    4.  

  2.  
  3. Start the engine and check for the signal waveform to synchronize with the camshaft sensor and the tooth that is missing. Refer to the sample waveforms in the illustration.

    Click image to see an enlarged view

    Fig. Using waveform synchronization to check the oil control solenoid as it relates to camshaft and crankshaft timing

  4.  

 
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