Expedition, Navigator 2006-2007

Crankshaft Position Sensor



5.4L & 6.8L Engines

The CKP sensor is a magnetic transducer mounted on the engine block or timing cover and is 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 trigger 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 trigger wheel, the CKP indicates crankshaft position and speed information to the PCM. By monitoring the missing tooth, the PCM uses the CKP signal to synchronize the ignition system and track the rotation of the crankshaft.

Removal & Installation

Gasoline Engines
  1. Disconnect the battery ground cable.
  3. Remove the accessory drive belt from the A/C compressor pulley.
  5. Raise and support the vehicle.
  7. Disconnect the wiring harness connector from the crankshaft position sensor.
  9. Disconnect the A/C compressor field coil electrical connector.
    It is not necessary to remove the A/C compressor bolts

  11. Loosen the bolts enough for the compressor to slide down one inch, allowing access for crankshaft position (CKP) sensor removal.
  13. For 2007 models remove the compressor and position aside.
  15. Remove the bolt and the CKP sensor.

To install:

  1. To install, reverse the removal procedure and note the following:
    1. Tighten the CKP sensor mounting bolt to 89 inch. lbs. (10 Nm).
    3. Tighten A/C mounting bolts to 18 ft. lbs. (25 Nm).



Click image to see an enlarged view

Fig. Crankshaft position sensor connector

  1. Checking the CKP sensor resistance:

    Turn ignition switch off.
    Disconnect the CKP sensor electrical connector.
    Measure the resistance between Pin 1 (CKP +) and Pin 2 (CKP -).
    The resistance reading should be between 250-1,000 ohms.
    If the resistance reading is not as stated, install a new CKP sensor.