Infinity_QX56_2004-2005

Crankshaft Position (CKP) Sensor

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Location



The crankshaft position sensor is located on the transaxle housing, facing the gear teeth of the drive plate.

Operation



The crankshaft position sensor detects the fluctuation of the engine revolution. The sensor consists of a permanent magnet, a core and a coil. When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. Due to the changing magnetic field, the voltage from the sensor changes and the ECM receives the voltage signal and detects the fluctuation of the engine revolution. The sensor is not directly used to control the engine system, only for the on-board diagnosis of potential misfire.

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Fig. The crankshaft position sensor

Testing



  1. Disconnect the crankshaft position sensor harness connector.
  2.  
  3. Loosen the mounting bolt of the sensor.
  4.  
  5. Remove the sensor and visually check the sensor for chipping or damage.
  6.  
  7. Check the resistance of the sensor. Resistance should be 166.5-203.5 ohms at 77°F (at 68-F for 4.1L and 2.0L engines).
  8.  

 
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