AIR CONDITIONING SYSTEM, Diagnostic DTC:B1476/76

DTC Code DTC Name
B1476/76 A/C Inverter Load System Malfunction

DESCRIPTION

The operation of the compressor with motor assembly is stopped and this DTC is stored if the rotation load is too large or too small while the compressor with motor assembly is operating.

Possible causes are refrigerant leaks, overcharged refrigerant, insufficient cooling due to a condenser fan circuit malfunction, or compressor lock.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1476/76 A/C Inverter Load System Malfunction Motor rotation load while compressor is operating is too large or too small

  • Refrigerant volume

  • Compressor with motor assembly

  • Cooling fan system

  • CAN communication system

 Memorized

CAUTION / NOTICE / HINT

CAUTION:


  • Before inspecting the high-voltage system, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • 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.

    Click here

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

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


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

      Click here

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

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING GTS


    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 and ECT / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Powertrain > Engine > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Control the Engine Cooling Fan Control electric cooling fan motor OFF/Low/High Perform this test when vehicle is stopped.

      Powertrain > Engine > Active Test
      Tester Display
      Control the Engine Cooling Fan
      Result
      Proceed to
      OK
      NG

    NG

    GO TO COOLING FAN SYSTEM Click here

    OK

  3. CHECK REFRIGERANT PRESSURE


    1. Install a manifold gauge set.

      for HFC-134a (R134a): Click here

      for HFO-1234yf (R1234yf): Click here

    2. Turn the power switch on (READY).

    3. B004QNJ

      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
      Result Proceed to
      OK A
      NG (for HFC-134a (R134a)) B
      NG (for HFO-1234yf (R-1234yf)) C

    A

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    B

    CHARGE REFRIGERANT Click here

    C

    CHARGE REFRIGERANT Click here