Miata 1990-1997

Oil Pressure Sensor

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Removal & Installation



Specific to:

Mazda Miata 1990-1997

  1. Unplug the connector and remove the oil pressure switch.
  2.  

To install:

  1. Apply silicone sealant to the oil pressure switch threads.
  2.  
  3. Installation is the reverse of removal. Tighten the switch to 9-13 ft. lbs. (12-17 Nm).
  4.  

Testing



Specific to:

Mazda Miata 1990-1997

  1. Verify that the oil pressure gauges goes to H when the ignition switch is turned to ON.
  2.  
  3. Verify that the oil pressure gauge goes to L when the engine is turned off.
  4.  
  5. If the oil pressure gauge does not move, inspect the oil pressure gauge and related wiring harness.
  6.  
  7. If the oil pressure gauge and related wiring harness are normal, inspect the oil pressure.
  8.  
  9. If the oil pressure is normal, replace the oil pressure switch.
  10.  
  11. Test the oil pressure as follows:
    WARNING
    Hot engines and oil can cause severe burns. Turn off the engine and wait until it and the engine oil have cooled.

    1. Unplug the connector and remove the oil pressure switch.
    2.  
    3. Screw an oil pressure gauge into the oil pressure switch installation hole.
    4.  
    5. Start the engine to normal operating temperature.
    6.  
    7. The temperature should be 43-56 psi (295-392 kPa) @ 3000 rpm.
    8.  

  12.  
  13. If the oil pressure is a specified, replace the switch.
  14.  

 
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