SRX 2004-2005

Camshaft Position Sensor

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Description & Operation



The ECM 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 ECM 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. Turn the ignition OFF .
  2.  
  3. On 3.6L engines, if replacing one of the left side sensors, remove the power steering fluid reservoir bolts and reposition the power steering fluid reservoir aside.
    NOTE
    Do not disconnect the power steering fluid lines/hoses from the reservoir.

  4.  
  5. Unplug the CMP sensor electrical connector.
  6.  
  7. Remove the CMP sensor bolt.
  8.  
  9. Remove the CMP sensor.
  10.  
  11. Installation is the reverse of removal. Tighten the bolt to 89 inch lbs. (10 Nm).

    Click image to see an enlarged view

    Fig. Unplug the electrical connector, then remove the bolt securing the CMP sensor

  12.  

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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