300, 300C & Magnum 2006-2008, Charger 2006-2008

Crankshaft Position Sensor

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Operation



The crankshaft position and engine speed are detected contactless signal (hall effect). The distance between the crankshaft position sensor and the gaps of the tone wheel is fixed by the installation position.

When the crankshaft rotates, an alternating voltage is generated in the crankshaft position sensor by the gaps of the tone wheel located behind the flex plate.

In this case, the metal portion of the tone wheel generates a positive voltage pulse and the gap in the tone wheel a negative voltage pulse. The distance from the positive to the negative voltage peak equals the length of the gap. The gap created by 3 missing teeth has the effect that no voltage is generated in the crankshaft position sensor. This gap, or time without a signal from the crankshaft sensor, is analyzed by the ECM in order to detect the TDC position of cylinder 1

Removal & Installation



2.7L & 3.5L Engines
  1. Disconnect negative battery cable.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Unlock and disconnect the electrical connector.
  6.  
  7. Remove the Crankshaft Position Sensor (CKP) mounting bolt.
  8.  
  9. Remove the CKP sensor.
  10.  

To install:

  1. Install the CKP sensor.
  2.  
  3. Install the mounting bolt and tighten to 105 inch lbs. (12 Nm).
  4.  
  5. Connect the electrical connector and lock.
  6.  
  7. Lower the vehicle.
  8.  
  9. Connect negative battery cable.
  10.  

5.7L Engine
  1. If equipped with All Wheel Drive (AWD) disconnect and isolate negative battery cable.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. If equipped with AWD remove the starter motor.
  6.  
  7. Disconnect the CKP electrical connector at the sensor.
  8.  
  9. Remove CKP mounting bolt.
  10.  
  11. Carefully twist sensor from the cylinder block.
  12.  
  13. Remove the CKP sensor from the vehicle.
  14.  
  15. Check condition of the sensor O-ring.
  16.  

To install:

  1. Clean out the machined hole in the engine block.
  2.  
  3. Apply a small amount of engine oil to the sensor O-ring.
  4.  
  5. Install the CKP sensor into the engine block with a slight rocking and twisting action.
  6.  
  7. Before tightening the sensor mounting bolt, be sure sensor is completely flush to cylinder block. If sensor is not flush, damage to the sensor mounting tang may result.
  8.  
  9. Install CKP mounting bolt and tighten to 105 inch lbs. (12 Nm).
  10.  

Testing



2.7L, 3.5L & 5.7L Engines
  1. Turn the ignition off.
  2.  
  3. Disconnect the Crankshaft Position Sensor (CKP) sensor harness connector.
  4.  
  5. Check connectors and clean or repair as necessary.
  6.  
  7. Turn the ignition on.
  8.  
  9. Measure the voltage of the (F855) 5 volt supply circuit in the CKP harness connector.
  10.  
  11. The voltage should be between 4.7-5.1 volts.
  12.  
  13. If the reading is not as stated check and repair open or high resistance in 5 volt supply circuit.

    Click image to see an enlarged view

    Fig. Crankshaft Position (CKP) sensor electrical connector all engines

  14.  

 
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