AutoZone 2008 Suzuki SX4 2.0L MFI DOHC 4cyl | Repair Guides | Engine Performance & Emission Controls | Components & Systems | Crankshaft Position Sensor | AutoZone.com

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    Ford Crown Victoria, Mercury Grand Marquis, Marauder, Lincoln Town Car 1999-2005

    Crankshaft Position Sensor

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    Operation





    Click image to see an enlarged view

    Fig. The CKP sensor trigger wheel rides on the front of the crankshaft. The missing tooth creates a fluctuation of voltage in the sensor

    The Crankshaft Position (CKP) sensor is a variable reluctance sensor that uses a trigger wheel to induce voltage. The CKP sensor is a fixed magnetic sensor mounted to the engine block and monitors the trigger or "pulse" wheel which is attached to the crank pulley/damper. As the pulse wheel rotates by the CKP sensor, teeth on the pulse wheel induce voltage inside the sensor through magnetism. The pulse wheel has a missing tooth that changes the reading of the sensor. This is used for the Cylinder Identification (CID) function to properly monitor and adjust engine timing by locating the number 1 cylinder. The voltage created by the CKP sensor is alternating current (A/C). This voltage reading is sent to the PCM and is used to determine engine RPM, engine timing, and is used to fire the ignition coils.



    Click image to see an enlarged view

    Fig. The CKP sensor trigger wheel rides on the front of the crankshaft. The missing tooth creates a fluctuation of voltage in the sensor

    The Crankshaft Position (CKP) sensor is a variable reluctance sensor that uses a trigger wheel to induce voltage. The CKP sensor is a fixed magnetic sensor mounted to the engine block and monitors the trigger or "pulse" wheel that is attached to the crank pulley/damper. As the pulse wheel rotates by the CKP sensor, teeth on the pulse wheel induce voltage inside the sensor through magnetism. The pulse wheel has a missing tooth that changes the reading of the sensor. This is used for the Cylinder Identification (CID) function to properly monitor and adjust engine timing by locating the number 1 cylinder. The voltage created by the CKP sensor is alternating current (A/C). This voltage reading is sent to the PCM, it is used to determine engine RPM, engine timing, and is used to fire the ignition coils.

    The CKP sensor is a magnetic transducer mounted on the engine block adjacent to a pulse wheel located on the crankshaft. By monitoring the crankshaft mounted pulse wheel, the CKP is the primary sensor for ignition information to the PCM. The pulse wheel has a total of 35 teeth spaced 10 degrees apart with one empty space for a missing tooth. The 6.8L 10-cylinder pulse wheel has 39 teeth spaced 9 degrees apart and one 9 degree empty space for a missing tooth. By monitoring the pulse wheel, the CKP sensor signal indicates crankshaft position and speed information to the PCM. By monitoring the missing tooth, the CKP sensor is also able to identify piston travel in order to synchronize the ignition system and provide a way of tracking the angular position of the crankshaft relative to a fixed reference for the CKP sensor configuration. The PCM also uses the CKP signal to determine if a misfire has occurred by measuring rapid decelerations between teeth.

    Removal & Installation





    Click image to see an enlarged view

    Fig. Remove the retaining bolt for the CKP sensor and remove the sensor from the front cover

    1. Disconnect the negative battery cable.
    2.  
    3. Remove the accessory drive belt from the engine.
    4.  
    5. Raise and safely support the vehicle.
    6.  
    7. Remove the A/C compressor mounting bolts, but do not disconnect the A/C lines. Remove and support the compressor out of the way.
    8.  
    9. Detach the electrical connector for the CKP sensor.
    10.  
    11. Remove the CKP sensor retaining bolts and remove the CKP sensor.
    12.  

    To install:

    1. Installation is the reverse of removal.
    2.  



    Click image to see an enlarged view

    Fig. Crankshaft Position Sensor

    Components

    1. A/C compressor field coil electrical connector
    2.  
    3. A/C compressor bolt (3 required)
    4.  
    5. A/C compressor
    6.  
    7. Crankshaft position (CKP) sensor electrical connector
    8.  
    9. CKP sensor bolt
    10.  
    11. CKP sensor
      WARNING
      If equipped with fire suppression system, disable the system before performing repairs.

    12.  
    13. Disconnect the battery ground cable.
    14.  
    15. Rotate the drive belt tensioner clockwise, and remove the drive belt from the A/C compressor pulley.

      Click image to see an enlarged view

      Fig. Drive belt tensioner

    16.  
    17. Disconnect the A/C compressor field coil electrical connector.
    18.  
    19. Disconnect the crankshaft position sensor (CKP) sensor electrical connector.
    20.  
    21. Remove the nut and detach the wiring harness clips. To install, tighten to 80 inch lbs. (9 Nm)

      Click image to see an enlarged view

      Fig.

    22.  
    23. Loosen the 3 A/C compressor bolts enough slide the compressor down one inch, allowing access for CKP sensor removal. It is not necessary to completely remove the A/C compressor bolts. To install, tighten to 18 ft. lbs. (25 Nm).

      Click image to see an enlarged view

      Fig.

    24.  
    25. Remove the CKP sensor bolt. To install, tighten to 89 inch lbs. (10 Nm).
    26.  
    27. Remove the CKP sensor.
    28.  

    To install, reverse the removal procedure.


    WARNING
    If equipped with fire suppression system, enable the system following assembly.

    Testing



    1. Measure the voltage between the sensor CKP sensor terminals by backprobing the sensor connector.
    2.  
    3. If the connector cannot be backprobed, fabricate or purchase a test harness.
    4.  
    5. Sensor voltage should be more than 0.1 volt AC with the engine running and should vary with engine RPM.
    6.  
    7. If voltage is not within specification, the sensor may be faulty.
    8.  

    1. Measure the voltage between the sensor CKP sensor terminals by backprobing the sensor connector.
    2.  


    NOTE
    If the connector cannot be backprobed, fabricate or purchase a test harness.

    1. Sensor voltage should be more than 0.1 volt AC with the engine running and should vary with engine RPM.
    2.  
    3. If voltage is not within specification, the sensor may be faulty.
    4.  

    Check the CKP Sensor resistance



    Key in OFF position
     
    Measure the resistance between:
     

    CKP+-CKP-

    Click image to see an enlarged view

    Fig. Crankshaft Position Sensor connector

    Is resistance between 250-1,000 ohms-

    Yes: CKP Sensor resistance is within acceptable limits. Proceed to pin test.

    No: Replace the CKP Sensor and verify repair.

    CMP Sensor Pin Testing


    NOTE
    For reference values, refer to PCM testing-PCM reference voltage chart

    This pinpoint test is intended to diagnose the following:



    Crankshaft position (CKP) sensor (6C315)
     
    Harness circuits: CKP(+) and CKP(-)

    Click image to see an enlarged view

    Fig.

     

     
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