AIR CONDITIONING SYSTEM, Diagnostic DTC:B1475/75

DTC Code DTC Name
B1475/75 A/C Inverter Cooling / Heating System Malfunction

DESCRIPTION

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

If the temperature exceeds the maximum, the compressor with motor assembly stops compressor operation, and this DTC will be output.

DTC No. DTC Detection Condition Trouble Area
B1475/75 Cooling water temperature in the inverter is outside the specified range (temperature is too high), or there is an open or short to ground in the temperature sensor circuit

  • Cooling fan system


  • Refrigerant volume


  • Compressor with motor assembly

  • CAN communication system

WIRING DIAGRAM

A000Z3DE02

PROCEDURE


  1. CHECK DTC (CAN COMMUNICATION SYSTEM)


    1. Use the intelligent tester to check if the CAN communication system is functioning normally.

      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output (for LHD) B
      CAN DTC is output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ELECTRICAL FAN)


    1. Select the Active Test, using the intelligent tester to generate a control command, and then check that the electrical fan operates.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Electrical Fan Electrical fan OFF or ON -
      OK
      Electrical fan operates smoothly.

    NG

    GO TO COOLING FAN SYSTEM Click here

    OK

  3. CHECK REFRIGERANT PRESSURE


    1. Install the manifold gauge set Click here.

    2. A000TPE

      Read the manifold gauge pressure when the following conditions are established.


      1. Prepare the vehicle according to the chart below.

        Item Condition
        Vehicle Doors All fully open
        Temperature Setting MAX COLD
        Blower Speed HI
        A/C switch ON
        R/F Switch

        RECIRCULATION

        (30 to 35°C (86 to 95°F))
        Standard pressure
        Low pressure side
        0.15 to 0.25 MPa (1.5 to 2.5 kgf/cm2)
        High pressure side
        1.37 to 1.57 MPa (14 to 16 kgf/cm2)

    NG

    CHARGE REFRIGERANT Click here

    OK

  4. READ OUTPUT DTC (DTC B1475)


    1. Clear the DTCs Click here.

    2. Prepare the vehicle according to the table below.

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

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1475 is not output A
      DTC B1475 is output B

      Note

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


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here