Inspection Procedure

1. Set the manifold gauge.
2. Read the manifold gauge pressure when these conditions are established.

   Test conditions:

   • Temperature at the air inlet with the switch set at RECIRC is 30 to 35°C (86 to 95°F)
   • Engine running at 1,500 rpm
   • Blower speed control switch at "HI" position
   • Temperature control dial at "COOL" position
   • Air conditioning switch ON
   • Fully open doors

   Standard: 

   Pressure on high pressure side: 1.37 to 1.57 MPa (13.9 to 16.0 kgf.cm2, 198 to 228 psi) 

HINT:

If the refrigerant pressure is below 196 KPa (2.0 kgf.cm2, 28 psi), the refrigerant amount the air conditioning cycle may have decreased significantly for reasons such as a gas leakage.

1. NG: INSPECT AND REPAIR AIR CONDITIONING CYCLE (SEE  ON-VEHICLE INSPECTION  ) 
2. OK: Go to Next Step. 

1. Disconnect the pressure switch connector.
2. Connect terminals 1 and 4 of the connector of the pressure switch on the vehicle wire harness side using a service wire.
3. Start the engine.
4. Turn the air conditioning switch is on and check that the magnet clutch is turned on.
5. Check that the magnet clutch is turned off when disconnecting terminals 1 and 4 (that are connected in the prior step).

   OK: 

   Terminals 1 and 4 connected: magnet clutch is on 

   Terminals 1 and 4 disconnected: magnet clutch is off 

Fig 1: Identifying Terminals Of Pressure Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: Go to step   3 
2. OK: REPLACE PRESSURE SWITCH (COOLER CONDENSER ASSY) 

1. Measure the resistance according to the value(s) in PRESSURE SWITCH (COOLER CONDENSER ASSY) - AIR CONDITIONING AMPLIFIER) RESISTANCE  .

   Standard: 

   PRESSURE SWITCH (COOLER CONDENSER ASSY) - AIR CONDITIONING AMPLIFIER) RESISTANCE
   
   

   Tester connection	Condition	Specified condition
   A11-26 (PSW) - P2-1	Always	Below 1 Ω
   P2-4 - Body ground	Always	Below 1 Ω
   A11-26 (PSW) - Body ground	Always	10 kΩ or higher
   P2-1 - Body ground	Always	10 kΩ or higher

   Fig 2: Checking Harness & Connector (Pressure Switch (Cooler Condenser Assy) - Air Conditioning Amplifier)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result: 

1. A: REPAIR OR REPLACE HARNESS OR CONNECTOR 
2. B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE  TERMINALS OF ECU  ) 
3. C: REPLACE AIR CONDITIONING AMPLIFIER (SEE  OVERHAUL  )