On-Vehicle Inspection

WARNING: This page is about a different car, the 2004 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT PRESSURE SWITCH NO. 1
1. Magnetic clutch control:
  Inspect pressure switch operation.
  1. Set on the manifold gauge set.
  2. Connect the positive (+) lead from the ohmmeter to terminal 4 and the negative (-) lead to terminal 1.
  3. Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration.
  If operation is not as specified, replace the pressure switch.
  
  Fig 1: Inspecting Pressure Switch (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Cooling fan control:
  Inspect pressure switch operation.
  1. Connect the positive (+) lead from the ohmmeter to terminal 2 and the negative (-) lead to terminal 3.
  2. Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration.
  If operation is not as specified, replace the pressure switch.
Fig 2: Inspecting Pressure Switch (2 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
COOLER COMPRESSOR ASSY W/MAGNETIC CLUTCH
1. Connect the positive (+) lead from the battery to terminal and the negative (-) lead to the body ground.
2. Check that the magnetic clutch energized.
If operation is not as specified, replace the magnet clutch assy.