GrandPrix, Impala 2006-2008, Monte Carlo 2006-2007

Camshaft Position Sensor

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Removal & Installation



3.1L, 3.4L, 3.5L And 3.9L Engines
  1. Remove the power steering pump.
  2.  
  3. Disconnect the Camshaft Position (CMP) sensor electrical connector.
  4.  
  5. Remove the CMP sensor bolt.
  6.  
  7. Remove the CMP sensor.
  8.  
  9. Inspect the sensor O-ring for wear, cracks or leakage if the sensor is not being replaced.

    Click image to see an enlarged view

    Fig. Removing and installing camshaft position sensor-3.1L and 3.4L engines



    Click image to see an enlarged view

    Fig. Removing and installing camshaft position sensor-3.5L and 3.9L engines

  10.  

To install:

  1. Lubricate the O-ring with clean engine oil. Replace the O-ring if the O-ring is damaged.
  2.  
  3. Install the CMP camshaft position sensor.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4.  
  5. Install the CMP sensor bolt and tighten to:

    3.1L and 3.4L engines: 71 inch lbs. (8 Nm)
     
    3.5L and 3.9L engines: 89 inch lbs. (10 Nm).
     

  6.  
  7. Connect the CMP sensor electrical connector.
  8.  
  9. Install the power steering pump.
  10.  

3.8L Engines
  1. Remove the coolant recovery reservoir.
  2.  
  3. Remove the drive belt.
  4.  
  5. Disconnect the electrical connector from the camshaft position sensor.
  6.  
  7. Remove the camshaft position sensor bolt.
  8.  
  9. Remove the camshaft position sensor from the engine front cover.

    Click image to see an enlarged view

    Fig. Removing and installing camshaft position sensor-3.8L Engines

  10.  

To install:

  1. Install the camshaft position sensor to the engine front cover.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2.  
  3. Install the CMP sensor bolt and tighten to89 inch lbs. (10 Nm).
  4.  
  5. Connect the CMP sensor electrical connector.
  6.  
  7. Install the drive belt.
  8.  
  9. Install the coolant recovery reservoir.
  10.  

5.3L Engine
  1. Disconnect the Camshaft Position (CMP) sensor electrical connector.
  2.  
  3. Remove the CMP sensor bolt (705).
  4.  
  5. Remove the CMP sensor (703).
  6.  
  7. Inspect the CMP sensor O-ring seal (704) for cuts or damage. If the seal is not cut or damaged, it may be reused.
  8.  
  9. Remove the CMP sensor O-ring seal (704), if necessary.

    Click image to see an enlarged view

    Fig. Removing and installing camshaft position sensor-5.3LL Engine

  10.  

TO install:

  1. Lubricate the O-ring seal with clean engine oil.
  2.  
  3. Install the O-ring seal onto the CMP sensor, if necessary.
  4.  
  5. Install the CMP sensor.
    NOTE
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  6.  
  7. Remove the CMP sensor bolt and then tighten to 106 inch lbs. (12 Nm).
  8.  
  9. Connect the CMP sensor electrical connector.
  10.  

Testing



Many intermittent open or shorted circuits come and go with harness and connector movement caused by vibration, engine torque, bumps and rough pavement, etc.

  1. Test the wiring harness and connectors by performing the following:

    Move the related connectors and wiring while monitoring the appropriate scan tool data.
     
    Move the related connectors and wiring with the component commanded ON and OFF, with the scan tool. Observe the components operation.
     
    With the engine running, move the related connectors and wiring while monitoring engine operation
     
    If harness or connector movement affects the data displayed, the component and system operation, or the engine operation, inspect and repair the harness or connections as necessary
     

  2.  
  3. Test the electrical connections and/or wiring by performing the following:

    Inspect for incorrect mating of the connector halves, or terminals not fully seated in the connector body, backed-out.
     
    Inspect for improperly formed or damaged terminals. Test for incorrect terminal tension.
     
    Inspect for poor terminal to wire connections including terminals crimped over insulation. This requires removing the terminal from the connector body.
     
    Inspect for corrosion or water intrusion. Pierced or damaged insulation can allow moisture to enter the wiring. The conductor can corrode inside the insulation with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits.
     
    Inspect for wires that are broken inside the insulation.
     

  4.  

 
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