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On-Vehicle Inspection [12/2019 - ]: Procedure

  1. INSPECT AIR CONDITIONER PRESSURE SENSOR 
    1. Check the wire harness.
      1. Disconnect the A24 air conditioner pressure sensor connector.
      2. Disconnect the H63 air conditioning amplifier assembly connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        A24-1 (-) - H63-15 (SG-4) Always Below 1 Ω
        A24-2 (PR) - H63-6 (PRE) Always Below 1 Ω
        A24-3 (+) - H63-11 (S5-3) Always Below 1 Ω
        A24-1 (-) or H63-15 (SG-4) - Other terminals and body ground Always 10 kΩ or higher
        A24-2 (PR) or H63-6 (PRE) - Other terminals and body ground Always 10 kΩ or higher
        A24-3 (+) or H63-11 (S5-3) - Other terminals and body ground Always 10 kΩ or higher

        If the resistance is not as specified, repair or replace the wire harness.

        GTY921526Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Front view of wire harness connector
        (Air Conditioner Pressure Sensor)
        *b Front view of wire harness connector
        (Air Conditioning Amplifier Assembly)
      4. Connect the H63 air conditioning amplifier assembly connector.
      5. Turn the ignition switch to ON.
      6. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Condition Specified Condition
        A24-3 (+) - Body ground Ignition switch on (IG) 4.75 to 5.25 V

        If the result is not as specified, repair or replace the wire harness or replace the air conditioning amplifier assembly.

        GTY924469Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Front view of wire harness connector
        (Air Conditioner Pressure Sensor)
    2. Check the air conditioner pressure sensor.
      1. Connect the A24 air conditioner pressure sensor connector.
      2. Install a manifold gauge set.
      3. Turn the A/C switch on.
      4. Measure the voltage according to the value(s) in the table below.
        GTY859172Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Component with harness connected
        (Air Conditioning Amplifier Assembly)        		 - -

        HINT: 

        Check from the rear of the connector while it is connected to the air conditioning amplifier assembly.

        Standard Voltage

        Tester Connection Condition Specified Condition
        H63-6 (PRE) - H63-15 (SG-4) Refrigerant pressure: Normal pressure (less than 3025 kPa (30.8 kgf/cm2 , 439 psi) and more than 176 kPa (1.8 kgf/cm2 , 26 psi)) 0.74 to 4.61 V

        If the voltage is not as specified, replace the air conditioner pressure sensor.

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