ION, L-Series, S-Series 1999-2005

Crankshaft Position Sensor

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Operation



The Crankshaft Position (CKP) sensor senses the crank angle (piston position) of each cylinder and converts it into a pulse signal. The PCM receives this signal and then computes the engine speed and controls the fuel injector timing and ignition timing based on this input.

Removal & Installation



  1. Disconnect the crankshaft position (CKP) sensor electrical connector.
  2.  
  3. Remove the CKP sensor bolt.
  4.  
  5. Remove the CKP sensor 
  6.  

To install:

  1. Installation is the reverse of removal.
  2.  

Testing



  1. Check the condition of the connector. Make sure the connector is firmly attached. Check for broken or bent connector pins. Repair any connector damage before continuing with troubleshooting the issue.
  2.  
  3. Check the condition of the wiring to the connector. If the wiring is damaged, repair the wiring before continuing with any further tests.
  4.  
  5. Remove the CKP sensor.
  6.  
  7. Inspect the CKP sensor for the following:

    Physical damage
     
    Excessive play or looseness
     
    Improper installation
     
    Foreign material passing between the CKP sensor and the reluctor wheel
     
    Electromagnetic interference in the CKP sensor circuits
     

  8.  
  9. Inspect the CKP reluctor wheel for the following:

    Physical damage
     
    Excessive play or looseness
     
    Improper installation
     

  10.  
  11. Turn OFF the ignition.
  12.  
  13. Disconnect the harness connector of the powertrain control module (PCM).
  14.  
  15. Measure the resistance between the signal circuit and the low reference circuit of the crankshaft position (CKP) sensor. The resistance should be 600-1000 ohms.
  16.  
  17. Measure the resistance between the signal circuit of the CKP sensor and a good ground. The reading should be infinity.
  18.  
  19. Disconnect the harness connector of the CKP sensor.
  20.  
  21. Measure the resistance of the signal circuit of the CKP sensor from the harness connector of the PCM to the harness connector of the CKP sensor. The resistance should be 5 ohms, if it is more, check for an open or high resistance in the signal circuit of the CKP sensor.
  22.  
  23. Turn ON the ignition, with the engine OFF.
  24.  
  25. Connect a test lamp between the signal circuit of the CKP sensor and a good ground. If the lamp illuminates, test the signal circuit for a short to ground or a short to voltage.
  26.  
  27. If there are no issues with the wiring and connectors, replace the sensor.

    Click image to see an enlarged view

    Fig. Crankshaft Position (CKP) sensor terminals; (1) Low reference, (2) CKP sensor signal

  28.  

 
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