Inspection Procedure

1. Check the sight glass of the cooler unit refrigerant liquid pipe.
   1. Prepare the vehicle according to the chart below.
      ITEM DESCRIPTION
      
      

      Item	Condition
      Vehicle Doors	Fully open
      Temperature Setting	MAX COLD
      Blower Speed	HI
      A/C	ON

   2. Compare the sight glass to the following chart.
      Fig 1: Identifying Sight Glass

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      ITEM DESCRIPTION
      
      

      Item	Symptom	Amount of Refrigerant	Corrective Actions
      1	Bubbles visible	Insufficient(1)	Check for gas leakage and repair if necessary Add refrigerant until bubbles disappear
      2	No bubbles visible	Empty, insufficient, or excessive	Refer to 3 and 4
      3	No temperature difference between compressor inlet and outlet	Empty or nearly empty	Check for gas leakage with gas leak detector and repair if necessary Evacuate A/C system and recharge with proper amount of refrigerant
      4	Considerable temperature difference between compressor inlet and outlet	Proper or excessive	Refer to 5 and 6
      5	Immediately after air conditioning is turned OFF, refrigerant clears	Excessive	Recover refrigerant Evacuate A/C system and recharge with proper amount of refrigerant
      6	Immediately after air conditioning is turned OFF, refrigerant foams and then becomes clear	Proper	-
      (1) Bubbles in the sight glass with the vehicle interior temperature above 35°C (95°F) can be considered normal if cooling is sufficient.

NG: CHARGE REFRIGERANT 

OK: Go to Next Step 

1. Disconnect the pressure sensor connector.
2. Disconnect the A/C amplifier connector.
3. Measure the resistance according to the value (s) in the table below.
   TESTER CONNECTION AND SPECIFIED CONDITION
   
   

   Tester Connection (Symbols)	Condition	Specified Condition
   J58-18 (SG-3) - A56-1 (-S)	Always	Below 1 Ω
   J58-27 (S5-3) - A56-3 (+S)	Always	Below 1 Ω
   J58-32 (PSW) - A56-2 (CUT+)	Always	Below 1 Ω
   J58-18 (SG-3) - Body ground	Always	10 kΩ or higher
   J58-27 (SS-3) - Body ground	Always	10 kΩ or higher
   J58-32 (PSW) - Body ground	Always	10 kΩ or higher

Fig 2: Identifying A/C Amplifier Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Install the manifold gauge set (See ON-VEHICLE INSPECTION  ).
2. Connect the three 1.5 V dry cell batterie's positive (+) lead to terminal 3 and the negative (-) lead to terminal 1. Then connect the voltmeter's positive (+) lead to terminal 2 and the negative (-) lead to terminal 1. Measure the voltage.

   OK: The voltage changes according to refrigerant pressure, as shown in the graph. 

   Fig 3: Inspecting Low Pressure Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE LOW PRESSURE SENSOR 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE