AIR CONDITIONING PRESSURE SENSOR ON-VEHICLE INSPECTION

PROCEDURE


  1. INSPECT AIR CONDITIONER PRESSURE SENSOR


    1. Check the wire harness.


      1. Disconnect the A39 air conditioner pressure sensor connector.

      2. Disconnect the P57 air conditioning amplifier assembly connector.

      3. B000W0RC02
        *a

        Front view of wire harness connector

        (to Air Conditioner Pressure Sensor)
        *b

        Front view of wire harness connector

        (to Air Conditioning Amplifier Assembly)

        Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        A39-1 (-) - P57-3 (SG-7) Always Below 1 Ω
        A39-2 (PR) - P57-24 (PRE) Always Below 1 Ω
        A39-3 (+) - P57-6 (S5-3) Always Below 1 Ω
        A39-1 (-) - Body ground Always 10 kΩ or higher
        A39-2 (PR) - Body ground Always 10 kΩ or higher
        A39-3 (+) - Body ground Always 10 kΩ or higher

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

      4. Reconnect the P57 air conditioning amplifier assembly connector.

      5. Turn the engine switch on (IG).

      6. B000W6YC02
        *a

        Front view of wire harness connector

        (to Air Conditioner Pressure Sensor)

        Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        A39-3 (+) - Body ground Engine switch on (IG) 4.75 to 5.25 V

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

    2. Check the air conditioner pressure sensor.


      1. Connect the connector to the air conditioner pressure sensor.

      2. Install a manifold gauge set.

      3. Warm up the engine.

      4. Turn the A/C switch on.

      5. Measure the voltage according to the value(s) in the table below.

        Tech Tips

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        P57-24 (PRE) - P57-3 (SG-7)

        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))

        		 0.62 to 4.73 V*

        Refrigerant pressure: Abnormal pressure (below 176 kPa (1.8 kgf/cm2, 26 psi), or 3025 kPa (30.8 kgf/cm2, 439 psi) or higher)

        		 Below 0.85 V, or 4.50 V or higher*

        *Value when sensor power source voltage is 5 V

        B000XD2C02
        *a

        Component with harness connected

        (Air Conditioning Amplifier Assembly)

        		 - -

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