Corvette 2005-2008

Camshaft Position Sensor

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Description & Operation



The PCM uses the Camshaft Position (CMP) sensor to determine the position of the No. 1 piston during its power stroke. This signal is used by the PCM to calculate fuel injection mode of operation.

If the cam signal is lost while the engine is running, the fuel injection system will shift to a calculated fuel injected mode based on the last fuel injection pulse, and the engine will continue to run.

Removal & Installation



  1. Remove the alternator bracket assembly.
  2.  
  3. Remove the camshaft position sensor mounting bolts as shown (1).
  4.  
  5. Remove the camshaft position sensor assembly (4, 5, 6) from the front cover (7).
  6.  
  7. Disconnect the camshaft position sensor jumper harness (2) and the engine harness (3) electrical connectors.
  8.  
  9. Remove the camshaft sensor assembly (4, 5, 6).
  10.  
  11. Disconnect camshaft position sensor (5) from the jumper harness (4).
  12.  
  13. Installation is the reverse of removal. Lubricate a new O-ring with clean engine oil. Tighten the bolt to 18 ft. lbs. (25 Nm).

    Click image to see an enlarged view

    Fig. CMP sensor harness mounting

  14.  

Testing



  1. Inspect the CMP sensor for correct installation. Remove the CMP sensor from the engine and inspect the sensor O-ring for damage. If the sensor is loose, incorrectly installed, or damaged, replace the CMP sensor.
  2.  
  3. Engage the CMP sensor harness connector to the CMP sensor.
  4.  
  5. Connect the scan tool to the diagnostic connector.
  6.  
  7. With the ignition ON, engine OFF observe the CMP Active counter parameter on the scan tool.
  8.  
  9. Pass a flat steel object across the tip of the sensor repeatedly. The CMP Active counter parameter should increment with each pass of the steel object.
  10.  
  11. If the parameter does not increment, replace the CMP sensor.
  12.  

 
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