Lexus IS250 · Service Manual HEATER & AIR CONDITIONING SYSTEM

ON-VEHICLE INSPECTION

Inspection


INSPECT PRESSURE SENSOR

  1. Pressure sensor

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

    2. E107326E05
      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.


INSPECT LOW PRESSURE SENSOR

  1. Low pressure sensor

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

    2. E124414E01
      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.

← INSTALLATIONCOMPONENTS →