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 its inverter temperature.

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

DTC No. DTC Detection Condition Trouble Area
B1475/75 Temperature of 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

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 ignition 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 Click here.

  • The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the diagnosis procedure for the hybrid control system first if any DTCs from those systems are output simultaneously.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


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

      OK
      CAN DTC is not output
      Result
      Result Proceed to
      OK A
      NG*1 B
      NG*2 C

      • *1: w/ Toyota Safety Sense

      • *2: w/o Toyota Safety Sense


    B

    GO TO CAN COMMUNICATION SYSTEM (w/ Toyota Safety Sense) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (w/o Toyota Safety Sense) Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (CONTROL THE ELECTRIC COOLING FAN)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Power train / Engine and ECT / Active Test.

    5. According to the display on the GTS, perform the Active Test.

      Engine and ECT
      Tester Display Test Part Control Range Diagnostic Note
      Control the Electric Cooling Fan Control electric cooling fan motor ON or OFF

      Perform this text when the following conditions are met:


      • Ignition switch is ON (IG).

      • Engine is stopped.

      • Shift lever in P.
      OK
      Electric cooling fan operates smoothly.

    NG

    GO TO COOLING FAN SYSTEM Click here

    OK

  3. CHECK REFRIGERANT PRESSURE


    1. Install a manifold gauge set Click here.

    2. Turn the ignition switch to ON (READY).

    3. A01UZC4E01

      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

        (25 to 35°C (77 to 95°F))
        Standard Pressure
        Low pressure side
        0.15 to 0.25 MPa (1.5 to 2.5 kgf/cm2, 21.3 to 35.6 psi)
        High pressure side
        1.37 to 1.57 MPa (14 to 16 kgf/cm2, 199 to 228 psi)

    NG

    CHARGE REFRIGERANT Click here

    OK

  4. READ OUTPUT DTC (DTC B1475/75)


    1. Clear the DTCs Click here.

    2. Turn the ignition switch to ON (READY).

    3. Prepare the vehicle according to the table below.

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

    4. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1475/75 is not output (normal) A
      DTC B1475/75 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 B1475/75 may be stored.


    A

    SYSTEM IS OK

    B

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here