Vibe 2006-2007

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. Raise the vehicle and remove the stone shield.
  2.  
  3. Disconnect the crankshaft position (CKP) sensor electrical connector.
  4.  
  5. Remove the CKP sensor bolt.
  6.  
  7. Remove the CKP sensor 
  8.  

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 crankshaft position (CKP) sensor electrical connector.
  14.  
  15. Measure the resistance of the CKP sensor. The resistance should be 1,630-2,740 Ohms at -10 to +50°C (+14 to +122°F) or 2,065-3,225 ohms at 50-100°C (122-212°F). If not, replace the crankshaft position sensor.
  16.  
  17. Connect the CKP sensor electrical connector.
  18.  
  19. Disconnect the powertrain control module (PCM) electrical connector C1.
  20.  
  21. Connect the multimeter across the PCM harness connector C1 terminal 27 and terminal 34.
  22.  
  23. Observe the AC voltage while cranking the engine. The voltage should be 1.4-1.6 volts.
  24.  
  25. Connect the multimeter to terminal 27 of the PCM harness connector C1 and ground.
  26.  
  27. Observe the AC voltage while cranking the engine. If the voltage reads 1.4-1.6 volts, repair the open in the CKP ground circuit. If not, repair the open or short on the CKP input circuit.
  28.  
  29. 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) Crankshaft position input, (2) Sensor ground

  30.  

 
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