Caliber 2007

Camshaft Position Sensor

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Description & 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. The input to the PCM occurs on a 5 volt output reference circuit. A ground for the sensor is provided through the sensor return circuit. The PCM identifies camshaft position by registering the change from 5 to 0 volts, as signaled from the camshaft position sensor.

The PCM determines fuel injection synchronization and cylinder identification from inputs provided by the camshaft position sensor and crankshaft position sensor. From the two inputs, the PCM determines crankshaft position.

Removal & Installation



Front Sensor
  1. Disconnect negative battery cable.
  2.  
  3. Remove the air cleaner hose to throttle body, disconnect the inlet air temperature sensor electrical connector.
  4.  
  5. Disconnect the electrical connector from the camshaft position sensor.
  6.  
  7. Remove the camshaft position (CMP) sensor mounting screws.
  8.  

To install:

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

  4.  
  5. Carefully attach the electrical connector. Take care not to damage the sensor pins.
  6.  
  7. Install the air intake assembly.
  8.  
  9. Connect the negative battery cable.
  10.  

Rear Sensor
  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the sensor electrical connector.
  4.  
  5. Remove the heat shield retaining nut and remove the heat shield.
  6.  
  7. Remove the camshaft position (CMP) sensor mounting and remove the sensor.

    Click image to see an enlarged view

    Fig. Disconnect the connector and remove the heat shield to access the rear CMP sensor.

  8.  

To install:

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

  4.  
  5. Tighten the mounting bolt to 80 inch lbs. (9 Nm).
  6.  
  7. Carefully attach the electrical connector to the CMP sensor. Take care not to damage the sensor pins.
  8.  
  9. Install the heat shield onto the mounting stud and tighten the retaining nut.
  10.  
  11. Connect the electrical connector.
  12.  
  13. Connect the negative battery cable.
  14.  

Testing



  1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Camshaft 1/1 Position Sensor and the Powertrain Control Module (PCM).
  2.  
  3. Look for any chafed, pierced, pinched, or partially broken wires.
  4.  
  5. Look for broken, bent, pushed out or corroded terminals.
  6.  
  7. Inspect the Camshaft 1/1 Position Sensor for conditions such as loose mounting screws, damage, or cracks.
  8.  
  9. If no other problems are found, remove the Camshaft 1/1 Position Sensor.
  10.  
  11. Inspect the Camshaft 1/1 Position Sensor and mounting area for any condition that would result in an incorrect signal, such as damage, foreign material, or excessive movement.
  12.  
  13. Using a diagnostic scan tool, check for the presence of any Diagnostic Trouble Codes (DTCs). Record and address these codes as necessary.
  14.  
  15. If no codes are present, review the scan tool environmental data. If possible, try to duplicate the conditions under which the DTC set.
  16.  
  17. If applicable, actuate the component with the scan tool.
  18.  
  19. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
  20.  
  21. Look for the data to change, the actuation to be interrupted, or for the DTC to reset during the wiggle test.
  22.  
  23. Refer to any Technical Service Bulletins (TSBs) that may apply.
  24.  
  25. Turn the ignition off.
  26.  
  27. 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.
  28.  
  29. Perform a voltage drop test on the related circuits between the suspected component and the Powertrain Control Module (PCM).
  30.  
  31. Inspect and clean all PCM, engine, and chassis grounds that are related to the most current DTC.
  32.  
  33. If numerous trouble codes were set, use a schematic and inspect any common ground or supply circuits.
  34.  
  35. For intermittent Misfire DTCs 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.
  36.  
  37. Use the scan tool to perform a System Test if one applies to the component.
  38.  
  39. A co-pilot, data recorder, and/or lab scope should be used to help diagnose intermittent conditions.
  40.  

 
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