Quest 1995-1996

Crankshaft Position Sensor

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Operation



Specific to:

Mercury Villager 1996-2000

Nissan Quest 1996-2000

On 1996-00 vehicles, the Crankshaft Position (CKP) sensor is used to detect fluctuations in engine revolution. This information is used by the PCM for on board diagnostics, and does not function as part of the engine control system.

The sensor consists of a permanent magnet, a core, and a coil. The CKP sensor is mounted in the transaxle housing facing the teeth on the flywheel. As the flywheel teeth pass, the magnetic field of the CKP sensor changes, causing voltage changes in the CKP sensor output. The PCM monitors the rate of CKP sensor voltage changes to detect engine misfires. CKP sensors are not used on 1993-95 vehicles.

Removal & Installation



Specific to:

Mercury Villager 1993-2000

Nissan Quest 1993-2000

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and safely support the front of the vehicle securely on jackstands.
  4.  
  5. Remove the CKP sensor heat shield retaining nut and remove the shield.
  6.  
  7. Disconnect the CKP sensor electrical connector.
  8.  
  9. Remove the CKP sensor bolt and remove the sensor.
  10.  
  11. The installation is the reverse of removal.

    Click image to see an enlarged view

    Fig. CKP sensor location

  12.  

Testing



Specific to:

Mercury Villager 1993-2000

Nissan Quest 1993-2000

  1. Remove the CKP sensor from the vehicle.
  2.  
  3. Visually inspect the sensor for signs of chipping or cracking, especially at the tip facing the flywheel.
  4.  
  5. Connect ohmmeter leads between the sensor terminals.
  6.  
  7. Compare the resistance with the following values:

    1996-98 vehicles: 432-528 ohms at 77°F (25°C).
     
    1999 vehicles: 166.5-203.5 ohms at 68°F (20°C).
     
    2000 vehicles: 512-632 ohms at 68°F (20°C).
     

  8.  
  9. If the readings are outside of specifications, replace the sensor.

    Click image to see an enlarged view

    Fig. Ohmmeter connections for CKP sensor testing

  10.  

 
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