Pressure Switch On-Vehicle Inspection

Heater & Air Conditioning System. Lexus Is250, Is220D. Gse20 Ale20
Air Conditioning. Lexus Is250, Is220D. Gse20 Ale20

  1. INSPECT PRESSURE SENSOR

  2. INSPECT LOW PRESSURE SENSOR

Pressure Switch -- On-Vehicle Inspection



1. INSPECT PRESSURE SENSOR


  1. Pressure sensor

    1. Install the manifold gauge set (Click here).



      2. Lexus Is250, Is220D. Gse20 Ale20.Air Conditioning.Air Conditioning System.Pressure Switch 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.
      If the voltage is not as specified, replace the pressure sensor.


2. INSPECT LOW PRESSURE SENSOR


  1. Low pressure sensor

    1. Install the manifold gauge set (Click here).



      2. Lexus Is250, Is220D. Gse20 Ale20.Air Conditioning.Air Conditioning System.Pressure Switch 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.
      If the voltage is not as specified, replace the low pressure sensor.