AIR CONDITIONING SYSTEM Cooling is Poor

DESCRIPTION

If the cooling air is poor (cooling air is discharged), the following causes are possible.

Malfunction Status Factor

  • Cooling is poor.

  • Takes time to cool down.

  • ECO drive mode function (air flow volume is restricted due to ECO drive mode being selected)

  • Compressor with motor assembly

  • Excessive refrigerant

  • Quantity of refrigerant gas lack

  • Dirty cooler condenser

  • Cooling fan system malfunction

  • A/M damper and link operation (jamming)

  • Automatic light control sensor

  • Warm air flow

WIRING DIAGRAM

B004C7OE08
*a Air Conditioning Amplifier Assembly
*b Automatic Light Control Sensor
*c Main Body ECU (Multiplex Network Body ECU)
*d CAN Communication Line

PROCEDURE


  1. CHECK ECO DRIVE MODE OPERATION


    1. Confirm setup of the ECO drive mode and turn it off if it becomes ON.

      Tech Tips


      • When ECO drive mode is on, the air conditioning amplifier assembly ensures a minimum level of air conditioning control based on certain conditions, thereby contributing to improved fuel efficiency. Accordingly, explain to customers that the air volume will be weaker in these situations.

        Control
        Airflow Control Automatically switches the air inlet port to the internal air circulation mode when the outside air temperature is equal to or higher than a predetermined temperature and reduces the power consumption.
        Air Inlet Control Sets the blower level in AUTO mode lower than normal, and suppresses the power consumption.

      • If combination switch assembly is malfunctioning, perform diagnosis on the ECO switch circuit.

        Click here

      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK REFRIGERANT PRESSURE


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Air Conditioner > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Regulator Pressure Sensor Air conditioner pressure sensor

      Min.: -0.4566 MPaG

      Max.: 3.2943 MPaG

      		 Actual refrigerant pressure displayed

      • Refrigerant line (gad leak etc.)

      • Air conditioner pressure sensor system malfunction

      Body Electrical > Air Conditioner > Data List
      Tester Display
      Regulator Pressure Sensor

    6. Install a manifold gauge set.


    7. Read the manifold gauge pressure when the following conditions are met.


      1. Prepare the vehicle according to the table below.

        Measurement Condition:
        Item Condition
        Vehicle doors Fully open
        Temperature setting MAX COLD
        Blower speed HI
        A/C switch On
        Recirculation/fresh switch RECIRCULATION
        Interior temperature 25 to 35°C (77 to 95°F)
      Standard Pressure
      Low pressure side
      150 to 250 kPa (1.5 to 2.5 kgf/cm2, 22 to 36 psi)
      High pressure side
      1370 to 1570 kPa (14 to 16 kgf/cm2, 199 to 228 psi)

    8. Compare the values displayed in the Data List and on the manifold gauge.

      OK
      The values displayed in the Data List and on the manifold gauge match.
      Result
      Proceed to
      OK
      NG

    NG

    CHARGE SYSTEM WITH REFRIGERANT for HFC-134a (R134a): Click here for HFO-1234yf (R1234yf): Click here

    OK

  3. PERFORM ACTIVE TEST USING GTS (SERVO PULSE)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Check the operation by referring to the table below.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Air Mix Servo Targ Pulse(D)

        for LHD:

      • No. 1 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operation


        for RHD:

      • No. 4 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operation

      Min.: 128

      Max.: 383

      		 Operates between 186 and 258 pulses
      Air Mix Servo Targ Pulse(P) No. 2 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) operation

      Min.: 128

      Max.: 383

      		 Operates between 154 and 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)
      OK
      Damper servo motor is operated.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO DTC OF APPLICABLE SERVO MOTOR OPERATING ABNORMALLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the Q3 automatic light control sensor connector.

    2. Disconnect the P7 main body ECU (multiplex network body ECU) connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q3-1 (CLTB) - P7-23 (CLTB) Always Below 1 Ω
      Q3-2 (CLTE) - P7-25 (CLTE) Always Below 1 Ω
      Q3-4 (CLTS) - P7-24 (CLTS) Always Below 1 Ω
      Q3-1 (CLTB) or P7-23 (CLTB) - Other terminals and body ground Always 10 kΩ or higher
      Q3-2 (CLTE) or P7-25 (CLTE) - Other terminals and body ground Always 10 kΩ or higher
      Q3-4 (CLTS) or P7-24 (CLTS) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT AUTOMATIC LIGHT CONTROL SENSOR


    1. Remove the automatic light control sensor.

      Click here

    2. Inspect the automatic light control sensor.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    GO TO ON-VEHICLE INSPECTION Click here

    NG

    REPLACE AUTOMATIC LIGHT CONTROL SENSOR Click here