LaCrosse 2006-2007

Variable Camshaft Timing Oil Control Solenoid

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Operation



The variable camshaft timing oil control solenoid (also called the Camshaft Position (CMP) actuator) has an outer housing that is driven by an engine timing chain. Inside the assembly is a rotor with fixed vanes that is attached to the camshaft. Oil pressure that is applied to the fixed vanes will rotate a specific camshaft in relationship to the crankshaft. The movement of the intake camshafts will advance the intake valve timing up to a maximum of 50 crankshaft degrees. The movement of the exhaust camshafts will retard the exhaust valve timing up to a maximum of 50 crankshaft degrees. When oil pressure is applied to the return side of the vanes, the camshafts will return to 0 crankshaft degrees, or Top Dead Center (TDC). The CMP actuator solenoid valve directs the oil flow that controls the camshaft movement. The ECM commands the CMP solenoid to move the solenoid plunger and spool valve until oil flows from the advance passage (11). Oil flowing through the CMP actuator assembly from the CMP solenoid advance passage applies pressure to the advance side of the vanes in the CMP actuator assembly. When the camshaft position is retarded, the CMP actuator solenoid valve directs oil to flow into the CMP actuator assembly from the retard passage (3). The ECM can also command the CMP actuator solenoid valve to stop oil flow from both passages in order to hold the current camshaft position.

The ECM operates the CMP actuator solenoid valve by Pulse Width Modulation (PWM) of the solenoid coil. The higher the PWM duty cycle, the larger the change in camshaft timing. The CMP actuator assembly also contains a lock pin (14) that prevents movement between the outer housing and the rotor vane assembly. The lock pin is released by oil pressure before any movement in the CMP actuator assembly takes place. The ECM is continuously comparing CMP sensor inputs with CKP sensor input in order to monitor camshaft position and detect any system malfunctions. If a condition exists in either the intake or exhaust camshaft actuator system, the opposite bank, intake or exhaust, camshaft actuator will default to 0 crankshaft degrees.

Click image to see an enlarged view

Fig. Component view of variable camshaft timing oil control solenoid system-3.6L engine

Removal & Installation



3.6L Engine
Exhaust-Bank 1 (Right Side)
  1. Turn the ignition OFF.
  2.  
  3. Remove the Camshaft Position (CMP) actuator valve electrical connector. The CMP actuator valve is also referred to as the variable camshaft timing oil control solenoid.
  4.  
  5. Remove the CMP actuator valve bolt.
  6.  
  7. Remove the CMP actuator valve.

    Click image to see an enlarged view

    Fig. Location of bank 1, exhaust, variable camshaft timing oil control solenoid-3.6L engine

  8.  

To install:

  1. Inspect the CMP actuator valve seal for damage. Replace the seal if necessary.
  2.  
  3. Install the CMP actuator valve.
  4.  
  5. Install the CMP actuator valve bolt. Tighten the CMP actuator valve bolt to 89 inch lbs. (10 Nm).
  6.  
  7. Install the CMP valve electrical connector.
  8.  

Exhaust-Bank 2 (Left Side)
  1. Turn the ignition OFF.
    NOTE
    Do not disconnect the power steering fluid lines/hoses from the reservoir.

  2.  
  3. Remove the power steering fluid reservoir bolts and reposition the power steering fluid reservoir in order to provide access.
  4.  
  5. Remove the Camshaft Position (CMP) actuator valve electrical connector. The CMP actuator valve is also referred to as the variable camshaft timing oil control solenoid.
  6.  
  7. Remove the CMP actuator valve bolt.
  8.  
  9. Remove the CMP actuator valve.

    Click image to see an enlarged view

    Fig. Location of bank 2, exhaust, variable camshaft timing oil control solenoid-3.6L engine

  10.  

To install:

  1. Install the CMP actuator valve.
  2.  
  3. Install the CMP actuator valve bolt. Tighten the CMP actuator valve bolt to 89 inch lbs. (10 Nm).
  4.  
  5. Install the CMP actuator valve electrical connector.
  6.  
  7. Install the power steering fluid reservoir.
  8.  

Intake-Bank 1 (Right Side)
  1. Turn the ignition OFF.
    NOTE
    Do not remove the Engine Control Module (ECM) from the ECM bracket.


    NOTE
    Do not remove the ECM redundant ground wire from the ECM.

  2.  
  3. Remove the ECM bracket bolts and reposition the ECM bracket in order to provide access.
  4.  
  5. Remove the Camshaft Position (CMP) actuator valve electrical connector. The CMP actuator valve is also referred to as the variable camshaft timing oil control solenoid.
  6.  
  7. Remove the CMP actuator valve bolt.
  8.  
  9. Remove the CMP actuator valve.

    Click image to see an enlarged view

    Fig. Location of bank 1, intake, variable camshaft timing oil control solenoid-3.6L engine

  10.  

To install:

  1. Install or connect the following:

    The CMP actuator valve
     
    The CMP actuator valve bolt. Tighten the CMP actuator valve bolt to 89 inch lbs. (10 Nm)
     
    The CMP actuator valve electrical connector
     
    The ECM bracket with the ECM
     

  2.  

Intake-Bank 2 (Left Side)
  1. Turn the ignition OFF.
    NOTE
    Do not disconnect the power steering fluid lines/hoses from the reservoir.

  2.  
  3. Remove the power steering fluid reservoir bolts and reposition the power steering fluid reservoir in order to provide access.
  4.  
  5. Remove the Camshaft Position (CMP) actuator valve electrical connector. The CMP actuator valve is also referred to as the variable camshaft timing oil control solenoid.
  6.  
  7. Remove the CMP actuator valve bolt.
  8.  
  9. Remove the CMP actuator valve.

    Click image to see an enlarged view

    Fig. Location of bank 2, intake, variable camshaft timing oil control solenoid-3.6L engine

  10.  

To install:

  1. Install or connect the following:

    The CMP actuator valve.
     
    The CMP actuator valve bolt. Tighten the CMP actuator valve bolt to 89 inch lbs. (10 Nm).
     
    The CMP actuator valve electrical connector.
     
    The power steering fluid reservoir.
     

  2.  

Testing



  1. Ensure the vehicle has the proper oil viscosity.
  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. Increase the engine speed to 1,500 RPM.
  8.  
  9. Command each solenoid to 25 percent. The angle desired parameter should match the solenoid actual parameter.
  10.  
  11. If the condition is intermittent:
    1. With the engine running, move the related harnesses and connectors
    2.  
    3. Monitor the circuit status for the component with a scan tool.
    4.  
    5. If the circuit status parameter changes from OK, or indeterminate, to fault, there may be a condition with the circuit or a connection.
    6.  

  12.  
  13. Turn OFF the ignition.
  14.  
  15. Disconnect the Camshaft Position (CMP) actuator solenoid to be tested. The CMP actuator valve is also referred to as the variable camshaft timing oil control solenoid.
  16.  
  17. Turn ON the ignition, with the engine OFF.
  18.  
  19. Probe the ignition 1 voltage circuit of the CMP actuator solenoid with a test lamp that is connected to the Engine Control Module (ECM) housing. The test lamp should illuminate.
  20.  
  21. Connect a test lamp between the control circuit of the CMP actuator solenoid and the ignition 1 voltage circuit of the CMP actuator solenoid.
  22.  
  23. Start the engine.
  24.  
  25. Command the appropriate CMP actuator solenoid from 0 to 40 and back to 0 degrees with a scan tool.
  26.  
  27. Exit the CMP actuator solenoid control function. The test lamp should turn ON when commanded with a scan tool.
  28.  
  29. With the ignition ON and the engine OFF.
    1. Measure the voltage from the control circuit of the solenoid to the ECM housing with a Digital Multi-Meter (DMM).
    2.  
    3. The voltage reading should be 2-3 volts.

      Click image to see an enlarged view

      Fig. Component view of variable camshaft timing oil control solenoid system-3.6L engine



      Click image to see an enlarged view

      Fig. Connector end view of variable camshaft timing oil control solenoid (all)-3.6L engine

    4.  

  30.  

 
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