Mazda Car 2002-04

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.

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.

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. Disconnect the battery negative cable.
  2.  
  3. Disconnect the CMP sensor connector.
  4.  
  5. Remove the timing belt cover and timing belt.
  6.  
  7. Remove the cylinder head cover.
  8.  
  9. Hold the camshaft using a wrench on the cast hexagon and loosen the camshaft pulley lock bolt.
  10.  
  11. Remove the camshaft pulley lock bolt.
  12.  
  13. Remove the camshaft pulley.
  14.  
  15. Remove the camshaft position sensor.
  16.  
  17. Install in the reverse order of removal. Tightening torque: Timing pulley bolt-91-103 ft lbs Sensor bolt- 69.5-95.4 ft lbs
  18.  
  19. Disconnect the camshaft position sensor connector.
  20.  
  21. Measure the resistance between terminals A and B using an ohmmeter. Standard value: 950-1250 ohms
  22.  
  23. If not within specification, check wiring harness and connectors between CMP sensor and PCM.
  24.  
  25. If within specifications, replace the sensor.

    Click image to see an enlarged view

    Fig. Removing the CMP sensor

  26.  

  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.  

  1. Disconnect the battery negative cable.
  2.  
  3. Disconnect the CMP sensor connector.
  4.  
  5. Remove the timing belt cover and timing belt.
  6.  
  7. Remove the cylinder head cover.
  8.  
  9. Hold the camshaft using a wrench on the cast hexagon and loosen the camshaft pulley lock bolt.
  10.  
  11. Remove the camshaft pulley lock bolt.
  12.  
  13. Remove the camshaft pulley.
  14.  
  15. Remove the camshaft position sensor.
  16.  
  17. Install in the reverse order of removal. Tightening torque: Timing pulley bolt-91-103 ft lbs Sensor bolt- 69.5-95.4 ft lbs

    Click image to see an enlarged view

    Fig. Removing the CMP sensor

  18.  

  1. Disconnect the battery negative cable.
  2.  
  3. Disconnect the CMP sensor connector.
  4.  
  5. Remove the timing belt cover and timing belt.
  6.  
  7. Remove the cylinder head cover.
  8.  
  9. Hold the camshaft using a wrench on the cast hexagon and loosen the camshaft pulley lock bolt.
  10.  
  11. Remove the camshaft pulley lock bolt.
  12.  
  13. Remove the camshaft pulley.
  14.  
  15. Remove the camshaft position sensor.
  16.  
  17. Install in the reverse order of removal. Tightening torque: Timing pulley bolt-91-103 ft lbs Sensor bolt- 69.5-95.4 ft lbs

    Click image to see an enlarged view

    Fig.

  18.  

Testing



  1. Disconnect the camshaft position sensor connector.
  2.  
  3. Measure the resistance between terminals A and B using an ohmmeter. Standard value: 550 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.

    Click image to see an enlarged view

    Fig. Testing the CMP sensor

  8.  

  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.  

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the camshaft position sensor connector.
  4.  
  5. Verify the continuity between camshaft position sensor connector terminal B and C.
  6.  
  7. If there is no continuity, repair the related harnesses. If they are okay, replace the camshaft position sensor.
  8.  

  1. Disconnect the camshaft position sensor connector.
  2.  
  3. Measure the resistance between terminals A and B using an ohmmeter. Standard value: 950-1250 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.

    Click image to see an enlarged view

    Fig.

  8.  

 
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