PT Cruiser 2006-2007

Crankshaft Position Sensor

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Operation



The Powertrain Control Module (PCM) sends approximately 5 volts to the Hall-effect sensor. This voltage is required to operate the Hall-effect chip and the electronics inside the sensor. A ground for the sensor is provided through the sensor return circuit. The input to the PCM occurs on a 5 volt output reference circuit that operates as follows: The Hall-effect sensor contains a powerful magnet. As the magnetic field passes over the dense portion of the counterweight, the 5-volt signal is pulled to ground (0.3 volts) through a transistor in the sensor. When the magnetic field passes over the notches in the crankshaft counterweight, the magnetic field turns off the transistor in the sensor, causing the PCM to register the 5-volt signal. The PCM identifies crankshaft position by registering the change from 5 to 0 volts, as signaled from the Crankshaft Position sensor.

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Raise and support the vehicle.
  6.  
  7. On SRT-4, remove the lower inner cooler hose from the metal tube.
  8.  
  9. Remove the structural collar.
  10.  
  11. Unlock and disconnect the electrical connector to the Crankshaft Position (CKP) sensor.
  12.  
  13. Remove the CKP sensor bolt.
  14.  
  15. Remove the CKP.

    Click image to see an enlarged view

    Fig. Remove the structural collar

  16.  

To install:

  1. Lubricate the CKP sensor O-ring with clean engine oil.
  2.  
  3. Install the CKP sensor using a twisting motion. Make sure the sensor is fully seated.
    WARNING
    Do not drive the senor into the bore with the mounting bolt.

  4.  
  5. Tighten the mounting bolt to 80 inch lbs. (9 Nm).
  6.  
  7. Connect the electrical connector to the CKP sensor.
  8.  
  9. Install the structural collar.
  10.  
  11. Lower the vehicle.
  12.  
  13. Connect the negative battery cable.
  14.  

Testing



  1. Using a diagnostic scan tool, check for the presence of any Diagnostic Trouble Codes (DTC-s). Record and address these codes as necessary.
  2.  
  3. If no codes are present, review the scan tool environmental data. If possible, try to duplicate the conditions under which the DTC set.
  4.  
  5. If applicable, actuate the component with the scan tool.
  6.  
  7. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
  8.  
  9. Look for the data to change, the actuation to be interrupted, or for the DTC to reset during the wiggle test.
  10.  
  11. Refer to any Technical Service Bulletins (TSB's) that may apply.
  12.  
  13. Turn the ignition off.
  14.  
  15. Visually inspect the related wire harness. Disconnect all the related harness connectors. Look for any chafed, pierced, pinched, partially broken wires and broken, bent, pushed out, or corroded terminals.
  16.  
  17. Perform a voltage drop test on the related circuits between the suspected component and the Powertrain Control Module (PCM).
  18.  
  19. Inspect and clean all PCM, engine, and chassis grounds that are related to the most current DTC.
  20.  
  21. If numerous trouble codes were set, use a schematic and inspect any common ground or supply circuits.
  22.  
  23. For intermittent Misfire DTC-s check for restrictions in the Intake and Exhaust system, proper installation of Sensors, vacuum leaks, and binding components that are run by the accessory drive belt.
  24.  
  25. Use the scan tool to perform a System Test if one applies to the component.
  26.  
  27. A co-pilot, data recorder, and/or lab scope should be used to help diagnose intermittent conditions.
  28.  

 
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