Mazda 323/MX-3/626/MX-6/Millenia/Protégé 1990-1998 and Ford Probe 1993-1997

Crankshaft Position Sensor

Print

OPERATION



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.

TESTING



See Figures 1 and 2

  1. Disconnect the crankshaft position sensor wire harness plug.
  2.  
  3. Connect an ohmmeter to the sensor terminals A and B and measure the resistance.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: Crankshaft position sensor connector terminals. Measure the resistance across the A and B terminals



Click image to see an enlarged view

Fig. Fig. 2: Measure the air gap between the crankshaft position sensor and the crankshaft pulley

  1. The reading should be 520-580 ohms at 68°F (20°C).
  2.  
  3. If not as specified, replace the sensor.
  4.  
  5. Measure the air gap of the sensor between the crankshaft pulley and the sensor.
  6.  
  7. Proper air gap should be 0.040-0.080 in. (1-2 mm).
  8.  
  9. If not as specified, inspect the crankshaft pulley and/or replace the sensor.
  10.  

REMOVAL & INSTALLATION



See Figure 3

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the necessary accessory drive belts to access the sensor.
  4.  



Click image to see an enlarged view

Fig. Fig. 3: Exploded view of the crankshaft position sensor mounting

  1. If necessary, remove the engine oil dipstick tube.
  2.  
  3. Remove the sensor attaching bolt, then withdraw the sensor from the engine.
  4.  
  5. Installation is the reverse of the removal procedure.
  6.  

 
label.common.footer.alt.autozoneLogo