Mazda Car 2005-06

Camshaft Position Sensor

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Description & Operation



The CMP sensor provides the camshaft position information, called the CMP signal, which is used by the Powertrain Control Module (PCM) for fuel synchronization.

The CMP sensor provides the camshaft position information, called the CMP signal, which is used by the Powertrain Control Module (PCM) for fuel synchronization.

Removal & Installation



  1. Remove the battery cover.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the plug hole cover.
  6.  
  7. Disconnect the CMP sensor connector.
  8.  
  9. Remove the CMP sensor installation bolt.
  10.  
  11. Remove the CMP sensor from the cylinder head cover.
  12.  
  13. Install in the reverse order of removal. Tightening torque 49-66 in lbs

    Click image to see an enlarged view

    Fig. Camshaft position sensor removal and installation-Mazda 3

  14.  

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the CMP sensor connector.
  4.  
  5. Remove the CMP sensor installation bolt.
  6.  
  7. Remove the CMP sensor.
  8.  
  9. Make sure that the CMP sensor is free of any metallic shavings or particles.
    NOTE
    If metallic shavings or particles are found on the sensor, clean them off.

  10.  
  11. Install the CMP sensor in the reverse order of removal. Tightening torque is 69.5-95.4 in lbs

    Click image to see an enlarged view

    Fig. Camshaft position sensor removal and installation-Except Mazda 3

  12.  

Testing



  1. Disconnect the camshaft position sensor connector.
  2.  
  3. Measure the resistance between terminals A and B using an ohmmeter. Standard value:

    4 cylinder-400-550 ohms
     
    6 cylinder-467-571 ohms
     

  4.  
  5. If not within specification, check wiring harness and connectors between CMP sensor and PCM.
  6.  
  7. If within specifications, replace the sensor.
    NOTE
    The camshaft position sensor requires a scan tool in order to properly test the component.

  8.  
  9. Connect a scan tool to the diagnostic connector.
  10.  
  11. Detach the fuel injector wire harness connectors. This will ensure that the engine does not try to start and run while performing the test.
  12.  
  13. Remove the distributor from the engine.
  14.  
  15. Detach the 3-wire connector from the distributor.
  16.  
  17. Enable the scan tool to record the camshaft position sensor output.
  18.  
  19. Rotate the distributor drive by hand and verify that there were four 5-volt pulses within one revolution of the distributor drive.
  20.  
  21. If not as specified, replace the distributor assembly.
  22.  

  1. Disconnect the camshaft position sensor connector.
  2.  
  3. Measure the resistance between terminals A and B using an ohmmeter. Standard value:

    4 cylinder-400-550 ohms
     
    6 cylinder-467-571 ohms
     

  4.  
  5. If not within specification, check wiring harness and connectors between CMP sensor and PCM.
  6.  
  7. If within specifications, replace the sensor.
    NOTE
    The camshaft position sensor requires a scan tool in order to properly test the component.

  8.  
  9. Connect a scan tool to the diagnostic connector.
  10.  
  11. Detach the fuel injector wire harness connectors. This will ensure that the engine does not try to start and run while performing the test.
  12.  
  13. Remove the distributor from the engine.
  14.  
  15. Detach the 3-wire connector from the distributor.
  16.  
  17. Enable the scan tool to record the camshaft position sensor output.
  18.  
  19. Rotate the distributor drive by hand and verify that there were four 5-volt pulses within one revolution of the distributor drive.
  20.  
  21. If not as specified, replace the distributor assembly.
  22.  

 
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