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 a DTC B1476/76 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 Code DTC Detection Condition Trouble Area
B1476/76 Motor rotation load while the compressor is operating is too large or too small.

  • Cooling fan system

  • Refrigerant volume

  • Compressor with motor assembly

  • CAN communication system

INSPECTION PROCEDURE

Note

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 Click here.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the GTS 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. CHECK COOLING FAN SYSTEM


    1. Check that the cooling fan system is functioning normally Click here.

      OK
      Cooling fan system is functioning normally

    NG

    GO TO COOLING FAN SYSTEM Click here

    OK

  3. CHECK REFRIGERANT PRESSURE


    1. Install a manifold gauge set.


    2. Turn the power switch on (Ready).

    3. A01FPYDE01
      Text in Illustration
      *a Low Pressure Side
      *b High Pressure Side

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


      1. Prepare the vehicle according to the chart below.

        Item Condition
        Vehicle Doors Fully open
        Temperature Setting LO
        Blower Speed Hi
        A/C Switch On
        R/F Switch Recirculation
        Interior Temperature 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
        Result Proceed to
        OK A
        NG (for HFC-134a [R134a]) B
        NG (for HFO-1234yf [R1234yf]) C

    B

    CHARGE REFRIGERANT Click here

    C

    CHARGE REFRIGERANT Click here

    A

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here