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 the 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 because of 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 the 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:


  • 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.

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

      Result
      Result Proceed to
      CAN DTCs are not output A
      CAN 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. Check the operation by referring to the table below.


      Powertrain > Engine and ECT > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Control the Electric Cooling Fan Control electric cooling fan motor ON/OFF

      Perform this test when the following conditions are met:


      • Power switch on (IG).

      • Engine is stopped.

      • Shift lever in P.

      Powertrain > Engine and ECT > Active Test
      Tester Display
      Control the Electric Cooling Fan
      OK
      Electric cooling fan operates smoothly.
      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. A01SFS7

      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
        Recirculation/fresh 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, 21.3 to 35.6 psi)
      High pressure side
      1.37 to 1.57 MPa (14 to 16 kgf/cm2, 199 to 228 psi)
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    NG

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