AIR CONDITIONING PRESSURE SENSOR ON-VEHICLE INSPECTION

INSPECT AIR CONDITIONING PRESSURE SENSOR

1. Check the wire harness.

   1. Disconnect the A55 air conditioning pressure sensor connector.

   2. Disconnect the I77 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 A55-1 (-) - I77-13 (SG-2) Always Below 1 Ω A55-2 (PR) - I77-9 (PRE) Always Below 1 Ω A55-3 (+) - I77-10 (S5-3) Always Below 1 Ω A55-1 (-) - Body ground Always 10 kΩ or higher A55-2 (PR) - Body ground Always 10 kΩ or higher A55-3 (+) - Body ground Always 10 kΩ or higher

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

   4. Reconnect the I77 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 Switch condition Specified Condition A55-3 (+) - Body ground Ignition switch ON 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 conditioning pressure sensor.

   1. Connect the connector to the air conditioning 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.

      Standard Voltage
      Tester Connection Condition Specified Condition I77-9 (PRE) - I77-13 (SG-2) Refrigerant pressure: (less than 3025 kPa (30.9 kgf/cm2, 439 psi) and more than 176 kPa (1.8 kgf/cm2, 25 psi)) 0.50 to 4.80 V

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

      Text in Illustration

      *a	Component with harness connected (Air Conditioning Amplifier)