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    2007 Jeep Compass

    Camshaft Position Sensor

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    Operation



    Specific to:

    Jeep Compass 2007-2009

    Jeep Patriot 2007-2009

    The Camshaft Position (CMP) sensor is a permanent magnet output coil device that operates within a 5-volt DC reference range, and monitors the speed and position of the camshaft. A reluctor is attached directly to the camshaft, and is used to generate a digital signal as it passes the magnetic coil; the alternating lines of magnetic flux are used by the sensor to produce a digital pulse. The CMP signal is used by the Powertrain Control Module (PCM) to calculate ignition timing, firing order, fuel injector timing, and misfire diagnostics.

    Removal & Installation



    Front Sensor

    Specific to:

    Jeep Compass 2007-2009

    Jeep Patriot 2007-2009

    1. Before servicing the vehicle, refer to the Precautions Section.
    2.  
    3. Disconnect negative battery cable.
    4.  
    5. Remove the air cleaner hose to throttle body, disconnect the inlet air temperature sensor electrical connector.
    6.  
    7. Disconnect the electrical connector from the camshaft position sensor.
    8.  
    9. Remove the Camshaft Position (CMP) sensor mounting screws.
    10.  
    11. Remove the front CMP sensor.

      Click image to see an enlarged view

      Fig. Camshaft Position (CMP) sensor location (front)-2.0L and 2.4L engines

    12.  

    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. This can cause the sensor to be incorrectly seated causing the engine to fail.

    4.  
    5. Tighten the CMP sensor mounting screws to 80 inch lbs. (9 Nm).
    6.  
    7. Carefully attach the electrical connector.
      WARNING
      Take care not to damage the sensor pins. Installation at an angle may damage the sensor pins.

    8.  
    9. Install the air cleaner to the throttle body hose and connect the inlet air temperature sensor electrical connector.
    10.  
    11. Connect the negative battery cable.
    12.  

    Rear Sensor

    Specific to:

    Jeep Compass 2007-2009

    Jeep Patriot 2007-2009

    1. Before servicing the vehicle, refer to the Precautions Section.
    2.  
    3. Disconnect the negative battery cable.
    4.  
    5. Disconnect the sensor electrical connector.
    6.  
    7. Remove the heat shield retaining nut and remove the heat shield to uncover the Camshaft Position (CMP) sensor.
    8.  
    9. Remove the CMP sensor mounting bolt 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

    10.  

    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. This can cause the sensor to be incorrectly seated causing the engine to fail.

    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 negative battery cable.
    12.  

    Testing



    Specific to:

    Jeep Compass 2007-2009

    Jeep Patriot 2007-2009


    NOTE
    Refer to the Electrical Wiring Diagram for component and connector locations, connector views, and circuit-specific information.

    CMP Circuit Testing

    Specific to:

    Jeep Compass 2007-2009

    Jeep Patriot 2007-2009

    Use a suitable scan tool or a Graphing Multi-Meter (GMM) in order to view the CMP data.

    CMP Sensor logic is based on alternating lines of magnetic flux which generate a digital ON/OFF signal to the PCM, and are based on the speed and position of the camshaft (See Figure 1).

    Verify that the engine timing components (timing belt, timing chain, or timing gears) are properly installed, and that there is no foreign material obstructing the path between the reluctor and the CMP sensor. If any engine mechanical faults are evident, locate and repair as required before continuing.

    A Digital Volt-Ohm Meter (DVOM) may be used to verify the condition of the wiring: additional information may be acquired by taking measurements at the sensor connector as well as the PCM connector. If significant resistance is measured (greater than 5 ohms) is measured, check the wiring harness and connections for corrosion, poor pin connections, or damaged wires.

    If all engine wiring and pin connections are confirmed, disconnect the CMP Sensor to verify the signal with a GMM, and verify PCM communication before replacing the CMP Sensor.

    Click image to see an enlarged view

    Fig. CMP Sensor Range Chart

    CMP Sensor Strategy

    Specific to:

    Jeep Compass 2007-2009

    Jeep Patriot 2007-2009

    The CMP Sensor provides a digital input signal (See Figure 1) to the Powertrain Control Module (PCM) for a number of engine control system calculations. The CMP signal is compared with the Crankshaft Position Sensor (CKP) and Vehicle Speed Sensor (VSS) for measured operating conditions, and the Pulse Width Modulation pattern is used by the Powertrain Control Module (PCM) to calculate ignition timing, firing order, fuel injector timing, and misfire diagnostics.

    CMP Sensor feedback patterns vary according to the reluctor configuration and PCM logic. While most models use a single tooth for Top Dead Center (TDC), others may use multiple reluctor teeth for additional positions of camshaft rotation, which may include one per cylinder, or 0°, 90°, 180°, and 270° respectively.

    Connection & Wiring Diagnosis

    Specific to:

    Jeep Compass 2007-2009

    Jeep Patriot 2007-2009

    Refer to the Electrical Wiring Diagram for component and connector locations, connector views, and circuit-specific information.

    Many intermittent open or short circuits may be caused by wiring harness and connector movement due to vibration, engine torque, bumps and rough pavement, etc.

    1. Test the wiring harness and connectors by performing the following tests:

      Move the related connectors and wiring while monitoring the appropriate scan tool data.
       
      Move the related connectors and wiring with the component commanded ON and OFF. Using a suitable the scan tool, observe the component operation.
       
      With the engine running, move the related connectors and wiring while monitoring component operation.
       
      If harness or connector movement affects the data displayed, the component and system operation, or the engine operation, inspect and repair the harness or connections as necessary.
       

    2.  
    3. Test the connector terminal pins and/or wiring by performing the following tests:

      Inspect for incorrect mating of the connector halves, or terminals not fully seated in the connector body.
       
      Inspect for improperly formed or damaged terminals and test for incorrect terminal tension.
       
      Inspect for poor terminal to wire connections including terminals crimped over insulation. This requires removing the terminal from the connector body.
       
      Inspect for corrosion or water intrusion. Pierced or damaged insulation can allow moisture to enter the wiring. The conductor can corrode inside the insulation with little visible evidence. Look for swollen and/or brittle sections of wire in the suspect circuits.
       
      Inspect for wires that are broken inside the insulation by gently pulling on suspect sections of wiring.
       

    4.  

    Related Diagnostic Trouble Codes

    Specific to:

    Jeep Compass 2007-2009

    Jeep Patriot 2007-2009



    Click image to see an enlarged view

    Fig. Related Diagnostic Trouble Codes

     
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