AIR CONDITIONING SYSTEM, Diagnostic DTC:B1476/76

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

DESCRIPTION

The compressor with motor assembly stops compressor control and outputs this DTC if the rotation load is too large or too small while controlling motor rotation in the compressor with motor assembly.

Possible causes are refrigerant gas leakage, overcharged refrigerant gas, insufficient cooling because of a condenser fan circuit malfunction, or compressor lock.

DTC No. DTC Detection Condition Trouble Area
B1476/76 Motor's 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

WIRING DIAGRAM

A01GWR8E04

INSPECTION PROCEDURE

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. A01H0XT

      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

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here