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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating / Air Conditioning System (Except HV, W/ Auto A/C) - Circuit Tests & Symptom Tests >> AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System) >> Cooling is Poor [12/2019 - 10/2022] >> Procedure

Cooling is Poor [12/2019 - 10/2022]: Procedure

  1. CHECK ECO MODE SETTING 
    1. Confirm that ECO drive mode is set to off.

      HINT: 

      When the ECO drive mode is set to ON, the air conditioning amplifier assembly performs minimal air conditioning control in order to promote the improvement of fuel economy. Ensure that the customer understands that the airflow volume will be decreased compared to normal operation.

      Control Control Summary
      Air Volume Control Sets the blower level to less.
    2. w/ Toyota Multi Operation Touch System:
      1. Confirm that ECO HEAT/COOL switch (multi-display assembly) is set to off.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK FOR DTC 
    1. Check for DTCs.

      Body Electrical > Main Body > Trouble Codes 

      Result

      Result Proceed to
      B1244 is not output A
      B1244 is output B

    Result: 

    B 

    GO TO DTC B1244 

    w/ AFS: Refer to DTC B1244: Light Sensor Circuit [12/2019 - 11/2023]

    w/o AFS: Refer to DTC B1244: Light Sensor Circuit [12/2019 - 11/2023]

    Result: 

    A 

    See step  3

  3. CHECK REFRIGERANT SHORTAGE 
    1. Prepare the vehicle according to the table below.
      MEASUREMENT CONDITION:

      Item Condition
      Vehicle Condition Engine running
      A/C Switch On
      Ambient Temperature*1 0 to 49°C (32 to 120°F)
      Air Conditioning Air Inlet Temperature*2 25 to 35°C (77 to 95°F)
      Set Temperature MAX COLD
      Recirculation/fresh Control Switch Recirculation
      Air Vent Damper Position FACE
      Blower Speed HI

      HINT: 

      *1: This inspection can be judged correctly only if the ambient temperature is within a range of 0 to 49°C (32 to 120°F). Therefore, postpone the test if the temperature is low.

      *2: This inspection can be judged correctly only if the air inlet temperature is within a range of 25 to 35°C (77 to 95°F). Therefore, postpone the test if the temperature is out of range.

    2. Using the GTS, check the amount of refrigerant.

      Body Electrical > Air Conditioner > Utility 

      Tester Display
      Refrigerant Gas Volume Check
      NOTE:

      If the conditions for the inspection are not met, "Refrigerant incorrect" will be displayed on the GTS. Confirm the conditions of the inspection and perform the check again.

      HINT: 

      • If the amount of refrigerant is insufficient, "Refrigerant shortage" is displayed on the GTS and the indicator light on the A/C switch turns off.
      • When performing this inspection, a DTC will not be output even if "Refrigerant shortage" is displayed on the GTS.

      Result

      Result Amount of Refrigerant
      Refrigerant shortage Insufficient or leakage
      Refrigerant correct Correct
      Refrigerant incorrect Incorrect

      OK

      "Refrigerant correct" is displayed on the GTS.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CHARGE SYSTEM WITH REFRIGERANT. Refer to  REPLACEMENT [12/2019 - ] 

    Result: 

    OK 

    See step  4

  4. PERFORM ACTIVE TEST USING GTS (AIR MIX SERVO PULSE) 
    1. 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 (driver side air mix) pulse Min.: 128
      Max.: 383      		 Operates between 165 to 257 pulses
      Air Mix Servo Targ Pulse(P) No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse Min.: 128
      Max.: 383      		 Operates between 255 to 347 pulses
      Rear Air Mix Servo Targ Pulse Rear air mix damper servo sub-assembly pulse Min.: 128
      Max.: 383      		 Operates between 213 to 258 pulses

      Body Electrical > Air Conditioner > Active Test 

      Tester Display
      Air Mix Servo Targ Pulse(D)

      Body Electrical > Air Conditioner > Active Test 

      Tester Display
      Air Mix Servo Targ Pulse(P)

      Body Electrical > Air Conditioner > Active Test 

      Tester Display
      Rear Air Mix Servo Targ Pulse

      OK

      Damper servo motor is operated.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET. Refer to  ON-VEHICLE INSPECTION [12/2019 - ] 

    Result: 

    NG 

    GO TO DIAGNOSTIC TROUBLE CODE CHART (FOR SERVO MOTOR OF APPLICABLE ABNORMAL OPERATION). Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 10/2022] 

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