626 1999-2001

Crankshaft Position Sensor

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Operation



Specific to:

Mazda 626 1999-2002

The crankshaft position sensor reads the rotation of the crankshaft, which the computer translates to determine engine-timing sequences. The computer uses this reading, in conjunction with the camshaft position sensor, to determine proper fuel injection and ignition timing.

Removal & Installation



Specific to:

Mazda 626 1999-2002

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the necessary accessory drive belts to access the sensor.
  4.  
  5. If necessary, remove the engine oil dipstick tube.
  6.  
  7. Remove the sensor-attaching bolt, and then withdraw the sensor from the engine.
  8.  
  9. Installation is the reverse of the removal procedure.
  10.  

Testing



Air Gap Inspection

Specific to:

Mazda 626 1999-2002

  1. Verify that the crankshaft position sensor is installed correctly and securely.
  2.  
  3. Measure the air gap between the crankshaft pulley teeth and the crankshaft position sensor using a feeler gauge. It should be 0.020-0.059 in. (0.5-1.5 mm).
  4.  
  5. If not as specified, replace the crankshaft pulley or the crankshaft position sensor.

    Click image to see an enlarged view

    Fig. Remove the CKP sensor connector and measure resistance-2.0L 4-cylinder engine



    Click image to see an enlarged view

    Fig. Remove the CKP sensor connector and measure resistance-2.5L V6 engine

  6.  

Measuring Resistance

Specific to:

Mazda 626 1999-2002

  1. Disconnect the battery negative cable.
  2.  
  3. Disconnect the crankshaft position sensor connector.
  4.  
  5. Measure the resistance between terminals A and B using an ohmmeter. Resistance should be about 550 ohms.
  6.  
  7. If not as specified, check related wiring harness.
  8.  
  9. If okay, replace the crankshaft position sensor.

    Click image to see an enlarged view

    Fig. Remove the CKP sensor connector and measure resistance

  10.  

 
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