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

Oil Pressure Switch

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TESTING



See Figure 1

  1. Detach the single wire harness connector from the oil pressure switch.
  2.  
  3. Turn the ignition switch ON . The oil pressure warning lamp should be off. If not, inspect the wire harness for shorts to ground.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: Connect an ohmmeter between the oil pressure switch and ground to check for continuity; both with the engine off and running

  1. Connect an ohmmeter to the pressure switch and a ground to check for continuity.
    1. With the engine OFF , the ohmmeter should read continuity.
    2.  
    3. With the engine running, the ohmmeter should read no continuity.
    4.  

  2.  
  3. If not as specified, perform an engine oil pressure test. Refer to Engine & Engine Rebuilding .
  4.  
  5. If the oil pressure reads normal, replace the switch.
  6.  

REMOVAL & INSTALLATION



See Figures 2 and 3

  1. Detach the single wire harness connector from the oil pressure switch.
  2.  
  3. Remove the switch from the engine by turning it counterclockwise.
  4.  



Click image to see an enlarged view

Fig. Fig. 2: The oil pressure switch can usually be found near the oil filter

  1. Installation is the reverse of the removal procedure. When installing the switch, count three threads up the switch then apply sealant from the third thread to the head of the switch. Tighten the switch to 8.7-13 ft. lbs. (12-17 Nm).
  2.  



Click image to see an enlarged view

Fig. Fig. 3: When installing the switch, count three threads up the switch then apply sealant from the third thread to the head of the switch

 
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