Avalanche, Express, Savana 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




NOTE
Use of a scan tool is required to complete this procedure. Anytime the CKP sensor is replaced, the variation learn procedure must be performed.

4.3L Engines
  1. Raise and safely support the vehicle.
  2.  
  3. Remove the skid plate, if equipped.
  4.  
  5. Unplug the harness connector from the sensor.
  6.  
  7. Remove the bolt securing the sensor, then remove it from the engine.
  8.  
  9. Installation is the reverse of removal. Lubricate a new O-ring with clean engine oil. Tighten the bolt to 89 inch lbs. (10 Nm). Connect the scan tool to the vehicle and perform the CKP sensor variation learn procedure.

    Click image to see an enlarged view

    Fig. CKP sensor mounting-4.3L engines

  10.  

4.8L, 5.3L And 6.0L Engines
  1. Raise and safely support the vehicle.
  2.  
  3. Remove the starter.
  4.  
  5. Working through the wheel well opening, unplug the harness connector from the sensor.
  6.  
  7. Clean the area around the sensor to prevent debris from entering the engine.
  8.  
  9. Remove the bolt securing the sensor, then remove it from the engine.
  10.  
  11. Installation is the reverse of removal. Lubricate a new O-ring with clean engine oil. Tighten the bolt to 18 ft. lbs. (25 Nm). Connect the scan tool to the vehicle and perform the CKP sensor variation learn procedure.

    Click image to see an enlarged view

    Fig. CKP sensor mounting-4.8L, 5.3L and 6.0L engines

  12.  

6.6L Engines
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the right wheelhouse liner to gain access to the CKP sensor.
  4.  
  5. Unplug the harness connector from the CKP sensor.
  6.  
  7. Remove the CKP sensor bolt, then remove the sensor from the engine.
  8.  
  9. Installation is the reverse of removal. Tighten the bolt to 89 inch lbs. (10 Nm).

    Click image to see an enlarged view

    Fig. CKP sensor mounting-6.6L engines

  10.  

8.1L Engines
  1. Raise and safely support the vehicle.
  2.  
  3. Remove the skid plate, if equipped. Remove any components necessary to ease access to the sensor (ignition coils, etc).
  4.  
  5. Unplug the harness connector from the sensor.
  6.  
  7. Remove the bolt securing the sensor, then remove it from the engine.
  8.  
  9. Installation is the reverse of removal. Lubricate a new O-ring with clean engine oil. Tighten the bolt to 106 inch lbs. (12 Nm). Connect the scan tool to the vehicle and perform the CKP sensor variation learn procedure.
  10.  

Testing



  1. Inspect the CKP sensor for correct installation. Remove the CKP sensor from the engine and inspect the sensor O-ring for damage. If the sensor is loose, incorrectly installed, or damaged, replace the CKP sensor.
  2.  
  3. Engage the CKP sensor harness connector to the CKP sensor.
  4.  
  5. Connect the scan tool to the diagnostic connector.
  6.  
  7. With the ignition ON, engine OFF observe the CKP Active counter parameter on the scan tool.
  8.  
  9. Pass a flat steel object across the tip of the sensor repeatedly. The CKP Active counter parameter should increment with each pass of the steel object.
  10.  
  11. If the parameter does not increment, replace the CKP sensor.
  12.  

 
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