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Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Yaris. 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.
        INSPECTION PROCEDURE CHART

        Item Condition
        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 Cooler Unit Refrigerant Liquid Pipe Sight Glass
        G04829530Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SIGHT GLASS DIAGNOSIS 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 Immediately after A/C turned OFF, refrigerant becomes clear Too much
    1. Drain or discharge refrigerant
    2. Bleed air and supply proper amount of purified refrigerant
    6 Immediately after A/C turned OFF, refrigerant foams and then becomes clear 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 USING TECHSTREAM (REGULATOR PRESSURE SENSOR) 
    1. Warm up the engine.
    2. Turn the ignition switch OFF.
    3. Connect the Techstream to the DLC3.
    4. Turn the ignition switch ON
    5. Turn the tester on.
    6. Select the following menus: Body Electrical / Main Body / Air Conditioner / Data List /
    7. According to the display on the tester, read the "Data List".

    DATA LIST/ AIR CONDITIONER 

    DATA LIST - AIR CONDITIONER

    Tester Display Measure Item/Range Normal Condition
    Regulator Pressure Sensor Regulator Pressure Sensor/ Min.: 0kgf/cm2 G, Max.: 38.25 kgf/ cm 2G 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 (When troubleshooting according to PROBLEM SYMPTOMS TABLE ) B
    OK (When troubleshooting according to 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 HARNESS AND CONNECTOR (PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER) 
    1. Disconnect the A3 air conditioning pressure sensor connector.
    2. Disconnect the E8 air conditioning amplifier connector.
    3. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      A3-1(-)-E8-11 (SG-1) Below 1 Ω
      A3-2 (PR) - E8-6 (PRE) Below 1Ω
      A3-3 (+) - E8-1 (S5-3) Below 1 Ω
      A3-1 (-) - Body ground 10 kΩ or higher
      A3-2 (PR) - Body ground 10 kΩ or higher
      A3-3 (+) - Body ground 10 kΩ or higher
    4. Reconnect the air conditioning pressure sensor connector.
    5. Reconnect the air conditioning amplifier connector.
      6. Fig 2: Identifying A3 Air Conditioning Pressure Sensor Connector Terminals
      G04829531Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  4. INSPECT AIR CONDITIONING AMPLIFIER 
    1. Remove the air conditioning amplifier with its connectors still connected.
    2. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      E8-11 (SG-1)-E8-12 (GND) Below 1 Ω
    3. Turn the ignition switch ON.
    4. Measure the voltage.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      E8-1(S5-3)-E8-11(SG-1) 4.5 to 5.5 V
    5. Reinstall the air conditioning amplifier.
      6. Fig 3: Identifying Air Conditioning Amplifier Connector Terminals
      G04829532Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE  AIR CONDITIONING AMPLIFIER  

    OK: GO TO NEXT STEP 

  5. INSPECT AIR CONDITIONING PRESSURE SENSOR 
    1. Remove the air conditioning amplifier with its connectors still connected.
    2. Set the manifold gauge.
    3. Warm up the engine.
    4. Turn the A/C switch ON.
    5. Measure the voltage.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Refrigerant Pressure Specified Condition
      E8-6(PRE)-E8-11 (SG-1) 0.196 to 3.14 MPa (2.0 to 32 kgf/cm2 ) 0.76 to 4.74 V
    6. Reinstall the air conditioning amplifier.
      7. Fig 4: Identifying E8 Air Conditioning Amplifier Connector Terminals
      G04829533Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE LIQUID TUBE SUB-ASSEMBLY A (AIR CONDITIONING PRESSURE SENSOR) 

    OK: REPLACE  AIR CONDITIONING AMPLIFIER  

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