Cobalt 2006-2008, G5 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) is attached to each camshaft and is hydraulically operated in order to change the angle of the camshaft relative to Crankshaft Position (CKP). The variable camshaft timing oil control solenoid is controlled by the control module. The control module sends a pulse width modulated 12 volt signal to a variable camshaft timing oil control solenoid. The solenoid controls the amount of engine oil flow. The variable camshaft timing oil control solenoid can change the camshaft angle a maximum of 25°. The control module increases the pulse width to accomplish the desired camshaft operation.

Removal & Installation



2.4L Engine


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Fig. Location of intake & exhaust variable camshaft timing solenoid electrical connectors-2.4L engine



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Fig. Location of the variable camshaft timing oil control solenoids-2.4L engine

  1. Remove the intake manifold cover.
  2.  
  3. Disconnect the intake (3) or exhaust (2) variable camshaft timing oil control solenoids, as required.
  4.  
  5. Remove the exhaust (1) variable camshaft timing oil control solenoid bolt and valve, as required.
  6.  
  7. Remove the intake (2) variable camshaft timing oil control solenoid bolt and valve, as required.
  8.  
  9. Inspect the solenoid valve O-ring seals for damage. Replace as necessary.
  10.  

To install:

  1. Lubricate the solenoid valve O-ring seals with clean engine oil.
  2.  
  3. Install the intake (2) variable camshaft timing oil control solenoid valve and bolt, as required. Tighten the bolt to 89 inch lbs. (10 Nm).
  4.  
  5. Install the exhaust (1) variable camshaft timing oil control solenoid valve and bolt, as required. Tighten the bolt to 89 inch lbs. (10 Nm).
  6.  
  7. Connect the intake (3) or exhaust (2) variable camshaft timing oil control solenoid valve electrical connector, as required.
  8.  
  9. Install the intake manifold cover.
  10.  

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.  

 
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