On-Vehicle Inspection

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

Set up manifold gauge set. See SET UP .
Disconnect connector.
Run engine at approx. 2,000 rpm.
Set blower speed control switch to "HI" position.
Set temperature control lever to "MAX. COOL" position.
A/C switch on.
Inspect pressure switch operation.
1. Connect the positive (+) lead from the ohmmeter to terminal 1 and negative (-) lead to terminal 2.
  
  Fig 1: Displaying Terminals 1 & 2
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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: Checking Continuity Between Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002