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AIR CONDITIONING SYSTEM, Diagnostic DTC:B1475

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DTC Code DTC Name
B1475 A/C Inverter Cooling / Heating System Malfunction
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DESCRIPTION

The temperature sensor of the compressor with motor assembly detects the A/C inverter temperature.

If the temperature exceeds the maximum, operation of the compressor with motor assembly will be stopped, and this DTC will be stored.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1475 A/C Inverter Cooling / Heating System Malfunction

  • Diagnosis condition: Power switch on (READY)

  • Malfunction status: Outside base temperature in the Inverter (unreasonable temperature)

  • Detection time: None

  • Cooling fan system

  • Refrigerant volume

  • Compressor with motor assembly

  • CAN communication system

 Memorized
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CAUTION / NOTICE / HINT

CAUTION:

  • Wear insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors. Carry the removed service plug in your pocket to prevent other technicians from accidentally reconnecting it while you are servicing the vehicle.

  • Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

Note:

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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  • The hybrid control system and air conditioning system output DTCs separately. Perform troubleshooting for the hybrid control system first if DTCs from these systems are output simultaneously.

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PROCEDURE


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    CHECK CAN COMMUNICATION SYSTEM


    1. Using the GTS, check if the CAN communication system is functioning normally.

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      Result
      Result Proceed to
      CAN communication system DTCs are not output A
      CAN communication system DTCs are output B

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    PERFORM ACTIVE TEST USING GTS (CONTROL THE ENGINE COOLING FAN DUTY RATIO)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Active Test.

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


      1. Powertrain > Engine > Active Test
        Tester Display Measurement Item Control Range Restrict Condition
        Control the Engine Cooling Fan Duty Ratio Electric cooling fan motor operation 0 to 100 (%)

        Perform this test when the following conditions are met:


        • Power switch on (IG)

        • Engine stopped

        • Shift lever in P



      1. Powertrain > Engine > Active Test
        Tester Display
        Control the Engine Cooling Fan Duty Ratio




      OK
      Electric cooling fan operates smoothly.
      Result
      Proceed to
      OK
      NG

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    CHECK REFRIGERANT PRESSURE


    1. Install a manifold gauge set.


    2. Turn the power switch on (READY).

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


      1. Prepare the vehicle according to the table below.

        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)
      Result
      Proceed to
      OK
      NG

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    CHECK FOR DTC


    1. Set the vehicle condition when the DTCs are output.


      1. Set the "Inspection Mode".

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      2. Prepare the vehicle according to the table below for 30 minutes or more.

        Item Condition
        Blower speed HI
        A/C switch On
        Temperature setting MAX. COLD

    2. Clear the DTCs.

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      1. Body Electrical > Air Conditioner > Clear DTCs


    3. Turn the power switch on (READY).

    4. Check for DTCs.

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      1. Body Electrical > Air Conditioner > Trouble Codes


      OK
      DTC B1475 is not output
      Result
      Proceed to
      OK
      NG
      Note:

      If the engine keeps idling when ambient temperature is high, the compressor with motor assembly may automatically stop to protect the inverter circuit, and DTC B1475 may be stored.