On-Vehicle Inspection

WARNING: This page is about a different car, the 2006 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

SET VEHICLE IN THESE CONDITION
1. Engine speed at 1,500 rpm
2. Blower speed control switch at "HI" position
3. Temperature control dial at "MAX. COOL" position
4. Manifold gauge set setting.
CHECK PRESSURE SWITCH
1. Disconnect the connector.
  
  Fig 1: Checking Pressure Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect pressure switch continuity (Magnetic Clutch Control)
  1. Connect the positive (+) lead from the ohmmeter to terminal 4 and the negative (-) lead to terminal 1.
  2. Check continuity between terminals when refrigerant pressure changes as shown.
    If continuity is not as specified, replace the pressure switch.
    
    Fig 2: Inspecting Pressure Switch Continuity
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002