Subaru Coupes/Sedans/Wagons 1985-1996 Repair Guide

Pressure Switch

Print

TESTING



Sedan, Coupe, Loyale, XT, Wagon and Brat
  1. Disconnect the pressure switch wire harness.
  2.  
  3. Connect an ohmmeter between the terminals of the pressure switch.
  4.  
  5. Verify that the pressure switch resistance is at least 1 megohm minimum when the compressor tank pressure is approximately 132-147 (910-1014 kPa).
  6.  
  7. Release the compressor tank pressure slowly, and verify that there is no resistance at the pressure switch terminals when the tank pressure reaches approximately 125 psi (862 kPa).
  8.  
  9. If not as specified, replace the pressure switch.
  10.  

Legacy
  1. Disconnect the pressure switch wire harness.
  2.  
  3. Connect an ohmmeter between the terminals of the pressure switch.
  4.  
  5. Verify the pressure switch resistance is at least 1 megohm when the compressor tank pressure is approximately 137 psi (945 kPa).
  6.  
  7. Release the compressor tank pressure slowly and verify that there is no resistance at the pressure switch terminals when the tank pressure reaches approximately 111 psi (765 kPa).
  8.  
  9. If not as specified, replace the pressure switch.
  10.  

REMOVAL & INSTALLATION



  1. Disconnect the negative battery cable.
  2.  
  3. Locate the air compressor assembly, and disconnect one air line from the compressor. The disconnected line will allow the compressor to pressure down slowly. Do not proceed until there is no more air escaping from the compressor assembly.
  4.  
  5. Loosen and remove the pressure switch from the compressor tank.
  6.  

To install:
  1. Install the pressure switch to the compressor tank, and tighten until snug.
  2.  
  3. Attach the air line to the compressor.
  4.  
  5. Connect the negative battery cable.
  6.  
  7. Start the engine, and allow enough time for the compressor to build up the proper amount of pressure before driving the vehicle.
  8.  

 
label.common.footer.alt.autozoneLogo