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Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK REFRIGERANT 
    1. Check the sight glass of the cooler unit refrigerant liquid pipe.
      1. Prepare the vehicle in accordance with the chart below.
        ITEM CHART

        Item Condition
        Engine Speed 1,500 rpm
        Vehicle Doors Fully open
        Temperature Setting MAX COLD
        Blower Speed HI
        A/C Switch ON
      2. Compare the sight glass to the following chart.
        Fig 1: Identifying Sight Glass Of Cooler Unit Refrigerant Liquid Pipe
        G05585220Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        AMOUNT OF REFRIGERANT - SYMPTOM CHART

        Item Symptom Amount of Refrigerant Corrective Procedures
        1 Bubbles visible Insufficient*
        1. Check for gas leakage and repair if necessary
        2. Add refrigerant until bubbles disappear
        2 No bubbles visible Empty, insufficient or too much Refer to items 3 and 4
        3 No temperature difference between compressor inlet and outlet Empty or nearly empty
        1. Check for gas leakage with gas leak detector and repair if necessary
        2. Add refrigerant until bubbles disappear
        4 Considerable temperature difference between compressor inlet and outlet Correct or too much Refer to items 5 and 6
        5 Refrigerant becomes clear immediately after A/C turned OFF Too much
        1. Drain or discharge refrigerant
        2. Bleed air and supply proper amount of purified refrigerant
        6 Refrigerant foams and then becomes clear immediately after A/C turned OFF Correct -
        HINT:
        *: If the ambient temperature is higher than usual but cooling is sufficient, bubbles in the sight glass are permissible.

    NG: CHARGE REFRIGERANT 

    OK: Go to next step 

  2. READ VALUE OF TECHSTREAM 
    1. Connect Techstream to the DLC3.
    2. Turn the ignition switch ON and turn Techstream ON.
    3. Select the item below in the Data List, and read the value displayed on Techstream.

      Air conditioning amplifier 

      DATA LIST - AIR CONDITIONING AMPLIFIER

      Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
      Regulator Pressure Sensor Regulator pressure sensor / Min.: -0.45668 MPaG
      Max.: 3.29437 MPaG      		 Actual regulator pressure is displayed -

      OK: 

      The display is as specified in the normal condition column. 

      Result 

      RESULT REFERENCE

      Result Proceed to
      NG A
      OK (Checking from the PROBLEM SYMPTOMS TABLE) B
      OK (Checking from the DTC) C

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

    C: REPLACE AIR CONDITIONING AMPLIFIER 

    A: Go to next step 

  3. CHECK WIRE HARNESS (PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER) 
    1. Disconnect the A21 pressure sensor connector.
    2. Disconnect the E37 amplifier connector.
      Fig 2: Identifying A21 And E37 Connector Terminals
      G05585221Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      A21-3 (+) - E37-10 (S5-3) Below 1 Ω
      A21-2 (PR) - E37-9 (PRE) Below 1 Ω
      A21-1 (-) - E37-13 (SG-2) Below 1 Ω
      A21-3 (+) - Body ground 1 MΩ or higher
      A21-2 (PR) - Body ground 1 MΩ or higher
      A21-1 (-) - Body ground 1 MΩ or higher

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: Go to next step 

  4. CHECK AIR CONDITIONING AMPLIFIER 
    1. Remove the air conditioning amplifier with its connectors still connected.
      Fig 3: Identifying E37 Connector Terminals
      G05585222Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      E37-13 (SG-2) - Body ground Below 1 Ω
    3. Turn the ignition switch ON.
    4. Measure the voltage of the wire harness side connector.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Specified Condition
      E37-10 (S5-3) - E37-13 (SG-2) 4.5 to 5.5 V

    NG: REPLACE AIR CONDITIONING AMPLIFIER 

    OK: Go to next step 

  5. INSPECT AIR CONDITIONING PRESSURE SENSOR 
    1. Turn the A/C switch ON.
    2. Disconnect the A21 sensor connector.
    3. Connect the three 1.5 V dry cell batteries' 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 in accordance with the refrigerant pressure as shown in the graph. 

      Fig 4: Measuring Resistance Between Air Conditioning Amplifier Terminals
      G05585223Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE AIR CONDITIONING PRESSURE SENSOR 

    OK: REPLACE AIR CONDITIONING AMPLIFIER 

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