On-Vehicle Inspection

WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.

SET VEHICLE IN THESE CONDITION
1. Running engine at 1,500 rpm
2. Blower speed control switch at "HI" position
3. Temperature control dial at "MAX. COOL" position
4. Set on manifold gauge set
INSPECT PRESSURE SWITCH OPERATION
1. Disconnect the connector.
  
  Fig 1: Disconnecting Connectors
  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 is changed, as shown in the illustration.
  If continuity is not as specified, replace the pressure switch.
  
  Fig 2: Magnetic Clutch Control Pressure/Continuity Specifications
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Inspect pressure switch continuity (Condenser Fan Control)
  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 3: Identifying Pressure Switch Continuity (Condenser Fan Control - Except Towing Package)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Identifying Pressure Switch Continuity (Condenser Fan Control - With Towing Package)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002