AIR CONDITIONING SYSTEM(for Manual Air Conditioning System) Cooling is Poor

DESCRIPTION

If the cooling effect of the air conditioning system is weak, the following factors may be the cause.

Symptom Factor

  • Cooling effectiveness is poor

  • Cooling response is slow

  • Compressor assembly with pulley (compressor solenoid) malfunction

  • Air conditioning amplifier assembly malfunction

  • Refrigerant volume (high)

  • Refrigerant volume (low)

  • Clogged cooler condenser assembly fins

  • Cooling fan system malfunction

  • Mechanical locking of damper and damper link

  • High inlet air temperature

PROCEDURE


  1. PERFORM REFRIGERANT SHORTAGE CHECK


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.


      Body Electrical > Air Conditioner > Utility
      Tester Display
      Refrigerant Gas Volume Check

    5. Check that the following conditions are met and perform the refrigerant shortage check according to the display on the GTS.

      Measurement Condition:
      Item Condition
      A/C switch On
      Ambient temperature* 0 to 49°C (32 to 120°F)
      Blower speed HI

      *: If the ambient temperature is not within the range shown, do not perform this check.

      Result
      Result Amount of Refrigerant
      Refrigerant correct Correct
      Refrigerant shortage Insufficient
      OK
      "Refrigerant correct" is displayed on GTS.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR REFRIGERANT LEAK Click here

    OK

  2. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Air Mix Servo Targ Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (air mix) pulse

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 165 to 257 pulses


        for RHD:

      • Operates between 255 to 347 pulses

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Mix Servo Targ Pulse(D)
      OK
      The No. 1 air conditioning radiator damper servo motor operates.
      Result
      Proceed to
      OK
      NG

    OK

    INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET Click here

    NG

    GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR Click here